{"title":"MerCruiser 4-Stroke 340HP Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px; border:1px solid #e5e7eb; border-radius:8px;\"\u003e\n  \u003cp\u003eThis page is for MerCruiser 4-Stroke 340HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main MerCruiser collection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the “Filter \u0026amp; Sort” controls to narrow results by horsepower, year range, and part category\/section.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block; padding:10px 16px; background:#0b62d6; color:#fff; text-decoration:none; border-radius:6px;\"\u003eBrowse All MerCruiser Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 340HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eSerial plate location: Look for the engine serial number tag on the starboard valve cover or near the flame arrestor; the drive unit and transom assembly have separate serial plates.\u003c\/li\u003e\n    \u003cli\u003eModel code basics: Note fuel system (carbureted vs. EFI\/MPI), drive family (Alpha or Bravo), and cooling type (raw-water or closed cooling). These affect gaskets, pumps, and thermostat parts.\u003c\/li\u003e\n    \u003cli\u003ePlatform clues: The 340 HP package is typically a 7.4L (454 CID) 4-stroke V8. EFI engines will have fuel rails and sensors; carb models have a single carburetor and mechanical fuel pump.\u003c\/li\u003e\n    \u003cli\u003eRecord details: Serial number, model designation, and drive ratio help verify propellers, anodes, and service components.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eEngine Overview\u003c\/h2\u003e\n  \u003ch3\u003e7.4L V8 (340 HP) Platform\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eGasoline 4-stroke V8, 7.4L displacement; carbureted or EFI\/MPI depending on year; typically paired with Alpha or Bravo sterndrives; raw-water or closed cooling.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e7.4L\/454 CID 340 HP packages in carb or EFI variants; common driveline packages include Bravo One\/Two\/Three.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eHigh torque for planing heavier boats, broad parts availability, robust cooling components when serviced on schedule.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eParts compatibility varies by carb vs EFI, cooling configuration, and drive family. Use engine and drive serials to confirm impellers, anodes, fuel filters, and gaskets.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines; always follow your official MerCruiser service manual and adjust for usage and environment.\u003c\/p\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eEngine oil + filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eChange more often for heavy loads or frequent idling; warm engine before draining.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-oil-filters\"\u003eMerCruiser Oil Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eGear oil (drive unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eEvery 100 hrs or season-end\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eCheck for water intrusion or metal particles; service seals if contamination is present.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\"\u003eMerCruiser Collection\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e100–200 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eInspect gap and insulator color; replace if fouled or out of spec.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e50–100 hrs or every season\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eDrain or replace sooner if water or debris is present; use ethanol-safe components.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-fuel-filters\"\u003eMerCruiser Fuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eEvery 2–3 seasons (or 200–300 hrs)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eReplace sooner for sand\/silt use or any overheat events.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-impellers\"\u003eMerCruiser Impellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eAnodes (corrosion protection)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eInspect monthly; replace when 50% worn\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eMatch material to water type (zinc for salt, aluminum for brackish, magnesium for fresh).\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-anodes\"\u003eMerCruiser Anodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service Kits — \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-service-maintenance-kits\"\u003eMerCruiser Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System — \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-impellers\"\u003eMerCruiser Impellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection — \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-anodes\"\u003eMerCruiser Anodes\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System — \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-fuel-filters\"\u003eMerCruiser Fuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical — \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-starters\"\u003eMerCruiser Starters\u003c\/a\u003e \u0026amp; \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-alternators\"\u003eAlternators\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGaskets \u0026amp; Sealing — \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-gaskets\"\u003eMerCruiser Gaskets\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropulsion — \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-propellers\"\u003eMerCruiser Propellers\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eOverheat alarm or weak discharge\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eInspect intake screens\/strainer, sea water pump impeller, thermostat, and hose clamps.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eWater pump kit, thermostat, intake screen, hoses, anodes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eVerify fuel quality, replace fuel\/water separator, check spark plugs and vacuum leaks; for EFI, inspect connectors and IAC.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eFuel filter, spark plugs, gaskets, sensors\/connectors\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eCheck propeller damage\/pitch, fuel delivery, ignition condition, and throttle linkage.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003ePropeller, fuel pump\/filter, spark plugs, ignition components\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eConfirm proper oil level; look for water intrusion; inspect seals, u-joints, and gimbal bearing.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eSeals, gear lube, bearings, bellows\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eCharging warning \/ low voltage\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eCheck belt tension\/condition, alternator output, and ground connections.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eAlternator, belt, battery cables\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable across different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eSome service items fit broadly, but many components differ by carb vs. EFI, cooling configuration, and Alpha vs. Bravo drivetrain. Always confirm with engine and drive serial numbers before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the water pump impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule of thumb, replace every 2–3 seasons (sooner in sandy\/silty water or after any overheat). Inspect annually for cracks, set, or missing vanes.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eChange every 100 hours or at least once per season, and always before winter storage to prevent corrosion from any moisture in the oil.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information do you need to confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eEngine serial number, model designation, fuel system (carb or EFI\/MPI), cooling type, and drive family (Alpha\/Bravo). Photos of the nameplate and the part you are replacing are also helpful.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px; border-top:1px solid #e5e7eb;\"\u003e\n  \u003cp\u003eReady to find parts for your MerCruiser by horsepower, year, and model? Browse the main brand collection and use the Filter \u0026amp; Sort controls to narrow your results.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block; padding:10px 16px; background:#0b62d6; color:#fff; text-decoration:none; border-radius:6px;\"\u003eShop MerCruiser Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px; color:#374151;\"\u003eIf you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"140-thermostat-kit-fits-mercruiser-v6-v8-engines-replaces-807252q4","title":"140° Thermostat Kit – Fits MerCruiser V6 \u0026 V8 Engines (Replaces 807252Q4)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003e140° Thermostat Kit – Fits MerCruiser V6 \u0026amp; V8 Engines\u003c\/strong\u003e is engineered for General Motors-manufactured MerCruiser V6 and V8 engines (262-454 CID) from 1983 to 2016. It is designed for models with standard cooling systems that require a 140°F thermostat and does not fit high-performance variants.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury\/Quicksilver 807252Q4, Sierra 18-3668, and GLM 13390.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOperates at a 140°F (60°C) opening temperature.\u003c\/li\u003e\n\u003cli\u003eDesigned for standard cooling systems in specified MerCruiser engines.\u003c\/li\u003e\n\u003cli\u003eIncludes thermostat, O-ring, and all necessary housing gaskets for a complete installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e807252T4\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e807252T7\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e8M0089715\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3668\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e13390\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-43150\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eThis kit fits a wide range of MerCruiser V6 and V8 engines manufactured by General Motors between 1983–2016. Verify your model and serial number range below to ensure correct fitment.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L V6 175\/185\/205\u003c\/td\u003e\n\u003ctd\u003e175-205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 0A331455-0B775129\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L V6\u003c\/td\u003e\n\u003ctd\u003e175-205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 0B773243-0F601126\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L\/LX GM\u003c\/td\u003e\n\u003ctd\u003e175-205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1993–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 0F000878-0F601126\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0L \u0026amp; 5.7L Small Block\u003c\/td\u003e\n\u003ctd\u003e200-260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983–1984\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 6218462-6899057\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0L\u003c\/td\u003e\n\u003ctd\u003e200-230\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 0B774445-0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0LX\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 5907058-0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.7L\/5.7MIE\/SKI\u003c\/td\u003e\n\u003ctd\u003e260-350\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 0B773305-0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.7L Ski\u003c\/td\u003e\n\u003ctd\u003e260-350\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 0A338533-0F775199\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e7.4L\/MIE\u003c\/td\u003e\n\u003ctd\u003e330-340\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1994\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 0B771113-0F351999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e8.2L MIE\u003c\/td\u003e\n\u003ctd\u003e380+\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–1992\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eModel years 0C878221-0D857199\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eThermostat Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eStandard Cooling System\u003c\/dd\u003e\n  \u003cdt\u003eTemperature Rating\u003c\/dt\u003e\n\u003cdd\u003e140°F (60°C)\u003c\/dd\u003e\n  \u003cdt\u003eOperating Temperature\u003c\/dt\u003e\n\u003cdd\u003e140°F (60°C) nominal opening\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eBrass Sleeve\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e16.5\" H x 8.5\" W x 8.5\" L\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.25 lb (0.11 kg)\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1-year (aftermarket)\u003c\/dd\u003e\n  \u003cdt\u003eFitment Note\u003c\/dt\u003e\n\u003cdd\u003eFor standard cooling systems only; not for use with high-performance engines\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Thermostat (8M6002714\/59137)\u003c\/li\u003e\n\u003cli\u003e1 x O-Ring (25-30224)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket Thermostat Housing Cover (27-33179-2)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket Thermostat Cover (27-41812)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket Thermostat Housing (27-47510)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket Lower Housing (27-530451\/27-48818-1)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket (27-33918) (Note: Inclusion may vary by kit)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eEnsure the engine is completely cool and disconnect the battery for safety.\u003c\/li\u003e\n\u003cli\u003eDrain the engine coolant or raw water to a level below the thermostat housing.\u003c\/li\u003e\n\u003cli\u003eLocate and carefully remove the bolts securing the thermostat housing. Note the position of any brackets or hoses.\u003c\/li\u003e\n\u003cli\u003eRemove the old thermostat and gasket\/seal from the housing or manifold and discard them.\u003c\/li\u003e\n\u003cli\u003eThoroughly clean the mating surfaces of the housing and manifold, removing all old gasket material or corrosion.\u003c\/li\u003e\n\u003cli\u003eInstall the new thermostat in the correct orientation, followed by the new gasket or seal as required.\u003c\/li\u003e\n\u003cli\u003eReinstall the thermostat housing cover and tighten the bolts to the manufacturer's recommended torque specifications.\u003c\/li\u003e\n\u003cli\u003eRefill the cooling system. Start the engine and let it warm up, checking carefully for any leaks around the housing. Top off coolant if necessary.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm this thermostat kit fits my engine?\u003c\/summary\u003e\u003cp\u003eThis kit is for GM-based MerCruiser V6 and V8 engines (1983–2016) with standard cooling systems. To ensure compatibility, compare your engine model and year to the \"Engine \u0026amp; Model Compatibility\" table on this page. Do not use this kit for high-performance models.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing engine thermostat?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include engine overheating, running too cold (not reaching proper operating temperature), erratic temperature gauge readings, and potential coolant leaks from the thermostat housing area.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat's the difference between a 140°F and a 160°F thermostat?\u003c\/summary\u003e\u003cp\u003eThe temperature rating indicates when the thermostat opens. A 140°F thermostat is typically used in raw\/saltwater-cooled engines to reduce salt and mineral buildup. A 160°F or higher thermostat is common in freshwater\/closed-cooling systems for better fuel efficiency. Always use the temperature specified by your engine's manufacturer.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs it necessary to replace all the included gaskets?\u003c\/summary\u003e\u003cp\u003eYes. To prevent leaks and ensure a proper seal, you should always replace all old gaskets and O-rings with the new ones provided in the kit whenever you change the thermostat.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should a marine thermostat be replaced?\u003c\/summary\u003e\u003cp\u003eAs a preventative measure, it's good practice to inspect your thermostat annually and replace it every 2-3 years, especially in saltwater environments. Replace it immediately if you notice any signs of cooling system problems.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50587184890171,"sku":"23TH635R1","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/807252Q4_28a963d5-db88-41bb-ba86-dd908132b4c1.jpg?v=1757934198"},{"product_id":"water-pump-body-gasket-fits-mercury-marine-mercruiser-engines-replaces-27-94914","title":"Water Pump Body Gasket – Fits Mercury Marine \u0026 MerCruiser Engines (Replaces 27-94914)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis is a direct replacement Water Pump Body Gasket – Fits Mercury Marine \u0026amp; MerCruiser Engines (Replaces 27-94914). It is designed for a precise fit on a wide range of MerCruiser inboard and sterndrive marine engines, including many V6 and V8 models manufactured between 1977 and 2001.\u003c\/p\u003e\n\u003cp\u003eThis gasket serves as a direct interchange for Mercury part numbers 27-94914 and 27-72780, as well as aftermarket equivalents like Sierra 18-0386 and GLM 32730.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstallation Method: Direct Replacement\u003c\/li\u003e\n  \u003cli\u003eOperating Environment: Designed for use in sea water pumps\u003c\/li\u003e\n  \u003cli\u003eIncluded Components: One water pump body gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e27-94914\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e27-72780\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-0386\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e32730\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eThis gasket fits a broad array of MerCruiser engines. Please verify your specific model and year to ensure correct fitment.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e50 (Multiple Models)\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003eModels include 503B3A, 503C4B, 503H3A, 503H4B, etc.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e200 (2 BBL.) GM 305 V-8\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–1987\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e228\/230\/260 (4 BBL.) GM 305 V-8\u003c\/td\u003e\n\u003ctd\u003e228-260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1982–1987\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e260 GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1982–1987\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e300 TEMPEST GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–1986\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e320 (EFI) GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e320\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1989\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e330 GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1977–1987\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e340 MIE W\/B\/W GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e340\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1981–1987\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e350 MAG Series\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1997\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003eMultiple variants (Alpha, Bravo, EFI, MPI)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e370\/400 TRS GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e370-400\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1978–1986\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e420-425 GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e420-425\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1993\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e440-450 GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e440-450\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983–1996\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e454 Series\u003c\/td\u003e\n\u003ctd\u003e454\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1997\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003eMultiple variants (MAG, EFI, MPI)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e460 TRS GM 482 V-8\u003c\/td\u003e\n\u003ctd\u003e460\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983–1986\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e465-500 GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e465-500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–1998\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e500 Bulldog GM 540 V-8\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–2001\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e525 SC GM 454\/502 V-8\u003c\/td\u003e\n\u003ctd\u003e525\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1998\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e575 GM 540 V-8\u003c\/td\u003e\n\u003ctd\u003e575\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1992\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e600 SC GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e600\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1998\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e800-900 SC GM 572 V-8\u003c\/td\u003e\n\u003ctd\u003e800-900\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1993–2000\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0L (2 BBL.) GM 305 V-8\u003c\/td\u003e\n\u003ctd\u003e5.0L\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0LX (4 BBL.) GM 305 V-8\u003c\/td\u003e\n\u003ctd\u003e5.0L\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.7L Series\u003c\/td\u003e\n\u003ctd\u003e5.7L\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–1997\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003eMultiple variants (Alpha, Bravo, EFI, TBI)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e7.4L Series\u003c\/td\u003e\n\u003ctd\u003e7.4L\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1997\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003eMultiple variants (MIE, Bravo, MPI, TBI)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e8.2L Series\u003c\/td\u003e\n\u003ctd\u003e8.2L\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–1997\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003eMultiple variants (MIE, MPI, Hurth)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003eSKI Series (Various)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–2002\u003c\/td\u003e\n\u003ctd\u003e27-94914\u003c\/td\u003e\n\u003ctd\u003eCompetition, Black Scorpion \u0026amp; MX variants\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater Pump Body Gasket\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect Replacement\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eOEM-equivalent Material\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e6.0 in × 7.13 in × 0.13 in\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.009 kg (0.32 oz)\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 year factory warranty\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eUsed in sea water pumps\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Water Pump Body Gasket (27-94914)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the vessel's battery and close the seacock to prevent water ingress.\u003c\/li\u003e\n  \u003cli\u003eDrain the seawater section of the cooling system.\u003c\/li\u003e\n  \u003cli\u003eLoosen and remove the mounting bolts securing the sea water pump body.\u003c\/li\u003e\n  \u003cli\u003eCarefully remove the old gasket. Use a plastic scraper to clean any residual gasket material from both the pump body and its mounting surface. Ensure surfaces are clean, dry, and smooth.\u003c\/li\u003e\n  \u003cli\u003ePosition the new gasket onto the mounting surface, aligning it with the bolt holes.\u003c\/li\u003e\n  \u003cli\u003eReinstall the water pump body, ensuring the gasket is not pinched or misaligned.\u003c\/li\u003e\n  \u003cli\u003eHand-tighten the mounting bolts, then torque them to the manufacturer's specified values in a crisscross pattern.\u003c\/li\u003e\n  \u003cli\u003eOpen the seacock, reconnect the battery, and start the engine. Immediately check for any water leaks around the pump body.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm this gasket fits my specific MerCruiser engine?\u003c\/summary\u003e\n  \u003cp\u003eThe most reliable method is to check your engine's model number and year against the compatibility table provided above. You can also verify by cross-referencing your existing gasket's part number with those listed in the Part Number Matrix.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are common signs of a failing water pump body gasket?\u003c\/summary\u003e\n  \u003cp\u003eThe most obvious sign is a visible water leak from the seam where the water pump body meets the engine block or bracket, especially when the engine is running. Other symptoms can include engine overheating or a low water pressure alarm if the leak is significant.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDo I need to use a sealant or adhesive with this gasket?\u003c\/summary\u003e\n  \u003cp\u003eGenerally, this type of gasket is designed to be installed dry. Applying sealant can sometimes interfere with a proper seal. However, always consult your engine's official service manual for model-specific recommendations.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should this gasket be replaced?\u003c\/summary\u003e\n  \u003cp\u003eIt is recommended to replace this gasket whenever the sea water pump is serviced, such as during an impeller change. It should also be replaced immediately if any leaks are detected.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM part or an aftermarket replacement?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the shipping speed and cost?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most regions. Expedited shipping options and exact costs will appear at checkout if available for your location.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n  \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images and specifications against your original part before ordering. If anything differs—even if your model appears on the compatibility list—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is strongly recommended for safety, proper function, and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions, with typical transit times of 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50590222025019,"sku":"27-94914","price":99.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/27-94914_5576bd11-c05a-408b-b902-6db5568f5b1c.jpg?v=1758080430"},{"product_id":"thermostat-kit-fits-mercury-marine-mercruiser-engines-replaces-338884","title":"Thermostat Kit – Fits Mercury Marine MerCruiser Engines (Replaces 338884)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eThermostat Kit – Fits Mercury Marine MerCruiser Engines (Replaces 338884)\u003c\/strong\u003e is engineered to regulate engine temperature for optimal performance in a wide range of Mercury Marine and MerCruiser gasoline stern drive and inboard engines from 1974 to 2021, including 3.0L to 8.2L models.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Mercury 338884, Sierra 18-3562, GLM 13371, Mallory 9-13009, and Quicksilver 338884, ensuring a precise fit and reliable function.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstalls directly into the engine's cooling system.\u003c\/li\u003e\n  \u003cli\u003eOpens at a consistent 142°F (61.1°C) to maintain proper operating temperature.\u003c\/li\u003e\n  \u003cli\u003eIncludes the necessary thermostat, gasket, and mounting bolts for a complete installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e46-338884\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eQuicksilver\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3562\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e13371\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory\u003c\/td\u003e\n        \u003ctd\u003e9-13009\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eFor MerCruiser models, this thermostat fits a wide variety of inline, V6, and V8 gasoline engines. For Mercury outboards, it is specific to V6 and V8 models from 1994 onwards.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e3.0L (181 CID)\u003c\/td\u003e\n        \u003ctd\u003e130–140\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1990–2015\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e4.3L (262 CID)\u003c\/td\u003e\n        \u003ctd\u003e180–220\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1986–2021\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e5.0L (305 CID)\u003c\/td\u003e\n        \u003ctd\u003e220–260\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1983–2021\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e5.7L (350 CID)\u003c\/td\u003e\n        \u003ctd\u003e220–350\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1974–2021\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e6.2L (377 CID)\u003c\/td\u003e\n        \u003ctd\u003e300–350\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2015–2021\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e7.4L (454 CID)\u003c\/td\u003e\n        \u003ctd\u003e310–385\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1991–2001\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e8.2L (502 CID)\u003c\/td\u003e\n        \u003ctd\u003e380–430\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1991–2018\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e200–350 HP Outboards\u003c\/td\u003e\n        \u003ctd\u003e200–350\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1994–2021\u003c\/td\u003e\n        \u003ctd\u003e338884\u003c\/td\u003e\n        \u003ctd\u003eV6 and V8 models only\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eThermostat Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eEngine Cooling System\u003c\/dd\u003e\n  \u003cdt\u003eOperating Temperature\u003c\/dt\u003e\n\u003cdd\u003e142°F (61.1°C) Opening Temperature\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM Replacement\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eStainless Steel \/ Brass\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eMetallic\u003c\/dd\u003e\n  \u003cdt\u003eProduct Dimensions\u003c\/dt\u003e\n\u003cdd\u003e6.0 x 7.13 x 1.25 inches\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.23 kg (0.5 lb)\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eIncludes Gasket and Mounting Hardware\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1-Year Limited Warranty\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e Thermostat (338884)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e Gasket (27-835844)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e Mounting Bolts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure the engine is completely cool. Disconnect the boat's battery for safety.\u003c\/li\u003e\n  \u003cli\u003ePlace a drain pan beneath the engine's heat exchanger or thermostat housing and drain the coolant.\u003c\/li\u003e\n  \u003cli\u003eLocate the thermostat housing. It is typically on top of the engine where the main coolant hose connects.\u003c\/li\u003e\n  \u003cli\u003eRemove the bolts securing the housing cover. You may need to gently tap the cover to break the seal.\u003c\/li\u003e\n  \u003cli\u003eNote the orientation of the old thermostat before removing it and its gasket.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean both mating surfaces of the housing and its cover, removing all old gasket material.\u003c\/li\u003e\n  \u003cli\u003eInstall the new thermostat in the correct orientation, followed by the new gasket.\u003c\/li\u003e\n  \u003cli\u003eReinstall the housing cover and tighten the bolts to the manufacturer-specified torque. Do not overtighten.\u003c\/li\u003e\n  \u003cli\u003eReconnect all hoses, refill the cooling system with the appropriate coolant, and reconnect the battery.\u003c\/li\u003e\n  \u003cli\u003eStart the engine and let it warm up, carefully checking for any leaks around the thermostat housing.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if my thermostat has failed?\u003c\/summary\u003e\u003cp\u003eCommon signs of a failed thermostat include the engine overheating (stuck closed) or taking too long to reach operating temperature (stuck open). You may see corresponding alarms on your gauges or notice poor performance.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWill this thermostat fit my specific engine model?\u003c\/summary\u003e\u003cp\u003eThis kit is designed for a broad range of MerCruiser and Mercury engines as listed in the compatibility table. Always verify your engine's model and year range against the table. If you are unsure, check your engine's service manual or part number.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs the gasket included in this kit?\u003c\/summary\u003e\u003cp\u003eYes, this is a complete kit that includes the thermostat, a new gasket, and two mounting bolts, providing everything needed for a standard replacement.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the correct operating temperature for this thermostat?\u003c\/summary\u003e\u003cp\u003eThis thermostat is designed to begin opening at 142°F (61.1°C), which is the standard temperature for the specified raw water-cooled engine models.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should a marine thermostat be replaced?\u003c\/summary\u003e\u003cp\u003eWhile there's no fixed interval, it is good practice to inspect the thermostat every few years or 200-300 hours. It is often replaced as preventative maintenance, especially if the boat is used in saltwater, which can accelerate corrosion.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat's the difference between an OEM part and an aftermarket one?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). It has been engineered and manufactured to meet or exceed original equipment specifications in terms of fit, form, and function. Our parts are produced in an ISO 9002 certified facility and undergo batch inspections to ensure quality and consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow fast is shipping and what does it cost?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free on all orders. Expedited shipping options and associated costs, if available for your location, will be displayed at checkout.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order number. Returns are accepted within our standard return window for unused items in their original packaging. Please see our policy page or contact us for detailed instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50592380387643,"sku":"338884","price":99.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/338884_9c288eea-c49e-4d46-8d3f-769d6f4308d7.jpg?v=1758212895"},{"product_id":"exhaust-manifold-gasket-fits-mercruiser-omc-volvo-penta-v8-454-540-cid-replaces-27-46820","title":"Exhaust Manifold Gasket – Fits MerCruiser, OMC, Volvo Penta V8 454-540 CID (Replaces 27-46820)","description":"\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis high-quality \u003cstrong\u003eExhaust Manifold Gasket – Fits MerCruiser, OMC, Volvo Penta V8 454-540 CID (Replaces 27-46820)\u003c\/strong\u003e provides a crucial seal between the cylinder head and the exhaust manifold, preventing exhaust gas leaks. It is engineered for a wide range of V8 big block GM engines, including MerCruiser 454, 482, 496, 502, and 540 CID models (1978–2001), Volvo Penta V8 454\/502 CID engines (1992+), and various OMC and Crusader V8 power plants.\u003c\/p\u003e\n  \u003cp\u003eThis gasket serves as a direct replacement for numerous OEM and aftermarket part numbers, including Mercury 27-46820, Volvo Penta 3852472, OMC 3852472, Crusader 96653, and Sierra 18-0418, ensuring broad compatibility.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eInstalls directly between the cylinder head and the exhaust manifold.\u003c\/li\u003e\n    \u003cli\u003eMade from a durable composite and metal material blend to withstand high temperatures and the harsh marine environment.\u003c\/li\u003e\n    \u003cli\u003eGuaranteed to meet or exceed original equipment specifications for fit, form, and function.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n  \u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e27-46820A1\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e3852472\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e0508878\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e0778127\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e0909613\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e3852472\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eCrusader\u003c\/td\u003e\n\u003ctd\u003e96653\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-0418\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e33760\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eOSCO\u003c\/td\u003e\n\u003ctd\u003eCW-GH\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eBarr\u003c\/td\u003e\n\u003ctd\u003eCHVA470000\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eBarr\u003c\/td\u003e\n\u003ctd\u003eMC47-27-46820\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n  \u003cp\u003eFits a comprehensive range of Mercury \/ MerCruiser V8 big block models from 1978 to 2001. Please verify your engine's serial number falls within the specified ranges for an exact match.\u003c\/p\u003e\n  \u003cp\u003eCompatible with Volvo Penta 7.4L (454) and 8.2L (502) GM-based engines manufactured from 1992 onward.\u003c\/p\u003e\n  \u003cp\u003eSuitable for specific OMC and Crusader V8 engines utilizing GM 454 and 502 CID blocks in sterndrive and inboard configurations.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003eModel\u003c\/th\u003e\n          \u003cth\u003eRated HP\u003c\/th\u003e\n          \u003cth\u003eStroke\u003c\/th\u003e\n          \u003cth\u003eYears\u003c\/th\u003e\n          \u003cth\u003eOEM Part No.\u003c\/th\u003e\n          \u003cth\u003eNotes\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e370 TRS GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1978–1985\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #4179554-6721527\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e370 TRS GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–1987\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #6721528-0B714586\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e400 TRS GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e340\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980–1986\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #4179554-0B457644\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e420 GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e420\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1989\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0A398941-0B622418\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e425 GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e425\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–1992\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0A398941-0D937011\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e425 (GEN. V) GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e425\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1993\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0A398941-0D937011\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e440 TRS GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e440\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983–1986\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #4179554-0B485220\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e450 (GEN. V) GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e450\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1995–1996\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0F347100-0F347277\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e460 TRS GM 482 V-8\u003c\/td\u003e\n\u003ctd\u003e460\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983–1986\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #4179554-6181046\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e465 GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e465\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–1992\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0C849992-0F213244\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e465 (GEN. V) GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e465\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1994\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0C849992-0F213244\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e500 (GEN. V) GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1994–1995\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0F213293-0F615766\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e500 (GEN. V) GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0F615767-0F745159\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e500 (GEN. VI) GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997–1998\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0F745195-0F877722\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e500 (GEN. VI) GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997–1998\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0K000001-0L000737\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e500 (GEN. VI) GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1997–1998\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0L000768-0L001772\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e500 (GEN. +) GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0L414639-0L601036\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e500 Bulldog GM 540 V-8\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–1996\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0C577254-0F745405\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e500 Bulldog\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999–2001\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0L414620-0M050281\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e525 SC GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e525\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1992\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0D456000-0F348963\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e525 SC (GEN. V) GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e525\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1995\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0D456000-0F348963\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e525 SC (GEN. V) GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e525\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0F615814-0F745215\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e600 SC GEN IV \u0026amp; V GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e600\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1996\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0D456489-0F877642\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e454 MAG. BRAVO (GEN. V) GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e385\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1994\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0D805069-0F304999\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e454 MAG. BRAVO (GEN. V) GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e385\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1995–1996\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0F305000-0F801699\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e454 MAG. BRAVO (GEN. V) GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e385\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996–1997\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0F801700-0K999999\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e454 MAG. BRAVO GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1992\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0B721206-0D805068\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e7.4L BRAVO (GEN. V) GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e310\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1996\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0D603118-0F800699\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e7.4L BRAVO (GEN. VI) GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e310\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996–1997\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0F800700-0K999999\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e7.4L MIE (LH) GEN. V GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e310\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1996\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0D715494-0F820141\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e7.4L MIE (LH) GEN. VI GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e310\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996–1997\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0F820142-0K999999\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e7.4l MIE W\/B\/W GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e310\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1992\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0B788366-0D715493\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e7.4L MIE W\/HURTH GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e310\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989–1992\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0C391564-0D715493\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e8.2L MIE GEN. V GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e405\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1993–1996\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0D857200-0F819619\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e8.2L MIE W\/HURTH GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e405\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–1992\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0C878221-0D857199\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e496 MAG (Base Model)\u003c\/td\u003e\n\u003ctd\u003e375\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2001\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0M025000-0M687082\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e496 MAG (H.O. Model)\u003c\/td\u003e\n\u003ctd\u003e425\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2001\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0M025000-0M687143\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e8.1L INBOARD (Base)\u003c\/td\u003e\n\u003ctd\u003e375\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2001\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0M026000-0M319124\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e8.1L INBOARD (H.O.)\u003c\/td\u003e\n\u003ctd\u003e420\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000–2001\u003c\/td\u003e\n\u003ctd\u003e27-46820\u003c\/td\u003e\n\u003ctd\u003eSerial #0M026000-0M319190\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003eV8 7.4\/454\u003c\/td\u003e\n\u003ctd\u003e310+\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992+\u003c\/td\u003e\n\u003ctd\u003e3852472\u003c\/td\u003e\n\u003ctd\u003eGM-based engines\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003eV8 8.2\/502\u003c\/td\u003e\n\u003ctd\u003e385+\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992+\u003c\/td\u003e\n\u003ctd\u003e3852472\u003c\/td\u003e\n\u003ctd\u003eGM-based engines\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e7.4L GM 454 CID V8\u003c\/td\u003e\n\u003ctd\u003e300+\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991+\u003c\/td\u003e\n\u003ctd\u003e0909613\/3852472\u003c\/td\u003e\n\u003ctd\u003eSterndrive and inboard\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e8.2L GM 502 CID V8\u003c\/td\u003e\n\u003ctd\u003e375+\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991+\u003c\/td\u003e\n\u003ctd\u003e0909613\/3852472\u003c\/td\u003e\n\u003ctd\u003eSterndrive and inboard\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eCrusader\u003c\/td\u003e\n\u003ctd\u003e454 CID V8\u003c\/td\u003e\n\u003ctd\u003e300+\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990+\u003c\/td\u003e\n\u003ctd\u003e96653\u003c\/td\u003e\n\u003ctd\u003eInboard applications\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eCrusader\u003c\/td\u003e\n\u003ctd\u003e502 CID V8\u003c\/td\u003e\n\u003ctd\u003e375+\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990+\u003c\/td\u003e\n\u003ctd\u003e96653\u003c\/td\u003e\n\u003ctd\u003eInboard applications\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eExhaust Manifold Gasket\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eBetween cylinder head and exhaust manifold\u003c\/dd\u003e\n    \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003eComposite \/ Metal\u003c\/dd\u003e\n    \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eV8 Big Block GM engines\u003c\/dd\u003e\n    \u003cdt\u003eEngine Displacement\u003c\/dt\u003e\n\u003cdd\u003e454-540 CID (7.4-8.8L)\u003c\/dd\u003e\n    \u003cdt\u003eEngine Types\u003c\/dt\u003e\n\u003cdd\u003eStern drives and inboards\u003c\/dd\u003e\n    \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e53.0 x 10.5 x 0.2 inches (1346.2 x 266.7 x 5.08 mm)\u003c\/dd\u003e\n    \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.06 lbs (0.027 kg)\u003c\/dd\u003e\n    \u003cdt\u003eQuantity per Package\u003c\/dt\u003e\n\u003cdd\u003e1\u003c\/dd\u003e\n    \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 year manufacturer warranty\u003c\/dd\u003e\n    \u003cdt\u003eOEM Reference\u003c\/dt\u003e\n\u003cdd\u003eMercury-Mercruiser 27-46820\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1\u003c\/span\u003e x Exhaust Manifold Gasket (27-46820)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eEnsure the engine is completely cool before beginning work.\u003c\/li\u003e\n    \u003cli\u003eDisconnect the battery and relieve any pressure from the cooling system.\u003c\/li\u003e\n    \u003cli\u003eCarefully remove the exhaust manifold, taking note of all connections.\u003c\/li\u003e\n    \u003cli\u003eThoroughly clean both the cylinder head and manifold mating surfaces. Remove all traces of old gasket material and carbon buildup.\u003c\/li\u003e\n    \u003cli\u003ePosition the new gasket over the exhaust ports, ensuring correct alignment.\u003c\/li\u003e\n    \u003cli\u003eReinstall the exhaust manifold, and tighten the bolts in the sequence and to the torque specifications recommended by the manufacturer.\u003c\/li\u003e\n    \u003cli\u003eReconnect all hoses, sensors, and the battery.\u003c\/li\u003e\n    \u003cli\u003eStart the engine and carefully check for any exhaust or coolant leaks around the manifold.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I confirm this gasket fits my specific engine?\u003c\/summary\u003e\n    \u003cp\u003eThe best way to ensure compatibility is to match your existing part number to one listed in our Part Number Matrix. Additionally, check your engine model and serial number against our detailed compatibility tables. If you're still unsure, please contact us with your engine details before purchasing.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the signs of a failing exhaust manifold gasket?\u003c\/summary\u003e\n    \u003cp\u003eCommon symptoms include a loud ticking or tapping noise from the engine bay (especially when cold), visible soot or black streaks around the manifold-head connection, a decrease in engine performance or fuel efficiency, and the smell of exhaust fumes inside the boat.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should this gasket be replaced?\u003c\/summary\u003e\n    \u003cp\u003eExhaust manifold gaskets do not have a fixed replacement interval. They should be replaced whenever the exhaust manifold is removed for service or if any signs of a leak are detected. It is good practice to replace them when installing a new manifold.\u003c\/p\u003e\n  \u003c\/details\u003e\n    \u003cdetails\u003e\n    \u003csummary\u003eCan I reuse my old gasket?\u003c\/summary\u003e\n    \u003cp\u003eNo. We strongly advise against reusing old exhaust gaskets. They are designed for one-time use and crush to create a seal. Reusing an old gasket will almost certainly result in an improper seal and exhaust leaks.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n    \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n    \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n    \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50593339474235,"sku":"27-46820","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/27-46820_5ee0cbe9-f14b-4946-baf6-7e03292eeaa8.jpg?v=1758250822"},{"product_id":"crankshaft-bearing-kit-fits-mercruiser-454-7-4l-v8-engines","title":"Crankshaft Bearing Kit – Fits MerCruiser 454 (7.4L) V8 Engines","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003eCrankshaft Bearing Kit\u003c\/strong\u003e is engineered for MerCruiser\/General Motors 7.4L (454 cu in) V8 engines, including MKIV, Gen V, and Gen VI models manufactured between 1977 and the early 2000s. It serves as a direct-fit replacement for the main bearings, crucial for restoring engine performance and reliability.\u003c\/p\u003e\n\u003cp\u003eIt directly interchanges with MerCruiser part numbers 23-818473, 23-818473001, 818473, and 85721, as well as FelPro 13020 and Marine Power MP0003-009, ensuring broad compatibility for engine rebuilds and repairs.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for internal engine assembly.\u003c\/li\u003e\n\u003cli\u003eConstructed from steel with a babbitt or aluminum overlay for durability.\u003c\/li\u003e\n\u003cli\u003eIncludes standard size (STD) main bearings for a factory-spec fit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e23-818473\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e23-818473001\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e23-8M0030217\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e818473\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e818473001\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e85721\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e85686\u003c\/td\u003e\n      \u003c\/tr\u003e\n        \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e827651T\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMarine Power\u003c\/td\u003e\n        \u003ctd\u003eMP0003-009\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eFelPro\u003c\/td\u003e\n        \u003ctd\u003e13020\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eFor MerCruiser and General Motors engines, this kit fits a wide range of 7.4L V8 models from different generations.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e7.4L (454 cu in) MKIV\u003c\/td\u003e\n        \u003ctd\u003e330-340\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1977–1989\u003c\/td\u003e\n        \u003ctd\u003e23-818473\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e7.4L (454 cu in) Gen V\u003c\/td\u003e\n        \u003ctd\u003e330-385\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1989–1996\u003c\/td\u003e\n        \u003ctd\u003e23-818473001\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e7.4L (454 cu in) Gen VI\u003c\/td\u003e\n        \u003ctd\u003e310-385\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1996–2000s\u003c\/td\u003e\n        \u003ctd\u003e23-8M0030217\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e454 MAG\u003c\/td\u003e\n        \u003ctd\u003e330-385\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1988–2000s\u003c\/td\u003e\n        \u003ctd\u003e818473001\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e454 King Cobra\u003c\/td\u003e\n        \u003ctd\u003e330-385\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1988–1996\u003c\/td\u003e\n        \u003ctd\u003e818473001\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e7.4L MIE\u003c\/td\u003e\n        \u003ctd\u003e310-330\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1983–2000s\u003c\/td\u003e\n        \u003ctd\u003e818473001\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e7.4L Bravo\u003c\/td\u003e\n        \u003ctd\u003e310-385\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1988–2000s\u003c\/td\u003e\n        \u003ctd\u003e818473001\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eCrankshaft Main Bearing Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eInternal engine assembly\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eGasoline\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eSteel with babbitt or aluminum overlay\u003c\/dd\u003e\n  \u003cdt\u003eBearing Size\u003c\/dt\u003e\n\u003cdd\u003eStandard (STD)\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e6.75\" L x 5.25\" H x 2.25\" W\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.75 kg (1.65 lbs)\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eTypically 1 year (varies by supplier)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Crankshaft Main Bearing Kit (Replaces 818473001)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure the engine block is completely disassembled, cleaned, and inspected for any damage or warping before starting.\u003c\/li\u003e\n  \u003cli\u003eCarefully place each bearing shell into its corresponding location in the block and main caps, ensuring the locking tangs are correctly seated.\u003c\/li\u003e\n  \u003cli\u003eGently lay the crankshaft onto the main bearings. Place a strip of Plastigauge on each journal before installing the main caps.\u003c\/li\u003e\n  \u003cli\u003eTorque the main cap bolts to the manufacturer's specified sequence and values.\u003c\/li\u003e\n  \u003cli\u003eRemove the main caps to measure the compressed Plastigauge and verify oil clearances are within the engine's service manual specifications.\u003c\/li\u003e\n  \u003cli\u003eIf clearances are correct, thoroughly lubricate all bearing surfaces and journals with a high-quality engine assembly lube.\u003c\/li\u003e\n  \u003cli\u003eReinstall the main caps and torque them to their final specification, following the correct pattern. Ensure the crankshaft rotates smoothly by hand.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm this kit fits my specific 7.4L engine?\u003c\/summary\u003e\u003cp\u003eThis kit is designed for MerCruiser\/GM 454 (7.4L) V8 engines from 1977-2000s. The best way to confirm fitment is to match your engine's OEM bearing part number to one of the numbers listed in our Part Number Matrix. Also, check the Engine Compatibility table for your specific model and year range.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of failing crankshaft bearings?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include a deep, rhythmic knocking or rumbling sound from the bottom of the engine (rod knock), low oil pressure readings, and the presence of metallic shavings in the engine oil upon inspection.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this a standard size (STD) or an oversized kit?\u003c\/summary\u003e\u003cp\u003eThis is a standard size (STD) bearing kit. It is intended for use with crankshafts that have not been machined or ground down. If your crankshaft has been resurfaced, you will likely need oversized bearings.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is required for a successful installation?\u003c\/summary\u003e\u003cp\u003eInstallation is a complex task that requires engine disassembly. You will need a torque wrench, Plastigauge for checking clearances, engine assembly lubricant, and the engine's service manual for exact torque specifications and sequences. Professional installation is highly recommended.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50593344717115,"sku":"13020","price":73.06,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/13020_b3bc549e-081d-41e6-bf82-1199f0778510.jpg?v=1758250992"},{"product_id":"timing-cover-gasket-fits-mercury-mercruiser-big-block-v8-454-502-replaces-mercury-27-54529","title":"Timing Cover Gasket – Fits Mercury\/Mercruiser Big Block V8 (454\/502) (Replaces Mercury 27-54529)","description":"\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis high-quality aftermarket \u003cstrong\u003eTiming Cover Gasket\u003c\/strong\u003e is designed for a precise fit on Mercury\/Mercruiser Big Block V8 (454\/502) engines manufactured across various models from 1969 to 2001. It ensures a reliable seal to prevent coolant and oil leaks from the front of the engine.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct cross-reference for Mercury part 27-54529 and Hardin Marine 700-30440.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEngineered for direct OEM-style replacement and fit.\u003c\/li\u003e\n\u003cli\u003eConstructed from durable paper\/composite gasket material.\u003c\/li\u003e\n\u003cli\u003eSold as a single, individual gasket.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket suppliers.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHardin Marine\u003c\/td\u003e\n        \u003ctd\u003e700-30440\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model and year in the table below.\u003c\/p\u003e\n\u003cp\u003eThis part fits a wide range of Mercury and Mercruiser big block engines. Please verify your specific model and serial number range before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eEngine\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e325\u003c\/td\u003e\n        \u003ctd\u003e325\u003c\/td\u003e\n        \u003ctd\u003eGM 427 V-8\u003c\/td\u003e\n        \u003ctd\u003e1969–1972\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 2278747-3780449\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e325 MIE\u003c\/td\u003e\n        \u003ctd\u003e325\u003c\/td\u003e\n        \u003ctd\u003eGM 427 V-8\u003c\/td\u003e\n        \u003ctd\u003e1968–1974\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 2278747-3780449\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e330\u003c\/td\u003e\n        \u003ctd\u003e330\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1977–1981\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 4623115-6083144\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e330\u003c\/td\u003e\n        \u003ctd\u003e330\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1982–1987\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 6083145-0B816540\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e330 MIE\u003c\/td\u003e\n        \u003ctd\u003e330\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1977–1980\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 4623115-5889913\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e340 MIE W\/B\/W\u003c\/td\u003e\n        \u003ctd\u003e340\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1981–1987\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 5889914-0B788365\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e350 MIE\u003c\/td\u003e\n        \u003ctd\u003e350\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1974–1976\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 3780450-4623109\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e370 TRS\u003c\/td\u003e\n        \u003ctd\u003e370\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1978–1985\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 4179554-6721527\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e370 TRS\u003c\/td\u003e\n        \u003ctd\u003e370\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1985–1987\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 6721528-0B714586\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e390\u003c\/td\u003e\n        \u003ctd\u003e390\u003c\/td\u003e\n        \u003ctd\u003eGM 482 V-8\u003c\/td\u003e\n        \u003ctd\u003e1969–1970\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 2781129-2825059\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e390 MIE\u003c\/td\u003e\n        \u003ctd\u003e390\u003c\/td\u003e\n        \u003ctd\u003eGM 482 V-8\u003c\/td\u003e\n        \u003ctd\u003e1969–1970\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 2781129-2825059\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e400 TRS\u003c\/td\u003e\n        \u003ctd\u003e400\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1980–1986\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 4179554-0B457644\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e420\u003c\/td\u003e\n        \u003ctd\u003e420\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1987–1989\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0A398941-0B622418\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e425 (GEN. V)\u003c\/td\u003e\n        \u003ctd\u003e425\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1992–1993\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0A398941-0D937011\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e425\u003c\/td\u003e\n        \u003ctd\u003e425\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1990–1992\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0A398941-0D937011\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e440 TRS\u003c\/td\u003e\n        \u003ctd\u003e440\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1983–1986\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 4179554-0B485220\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e454 MAG ALPHA\u003c\/td\u003e\n        \u003ctd\u003e454\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1986–1988\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0A631894-0B785148\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e454 MAG BRAVO\u003c\/td\u003e\n        \u003ctd\u003e454\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1988–1992\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0B721206-0D805068\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e460 TRS\u003c\/td\u003e\n        \u003ctd\u003e460\u003c\/td\u003e\n        \u003ctd\u003eGM 482 V-8\u003c\/td\u003e\n        \u003ctd\u003e1983–1986\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 4179554-6181046\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e465 (GEN. V)\u003c\/td\u003e\n        \u003ctd\u003e465\u003c\/td\u003e\n        \u003ctd\u003eGM 502 V-8\u003c\/td\u003e\n        \u003ctd\u003e1992–1994\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0C849992-0F213244\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e465\u003c\/td\u003e\n        \u003ctd\u003e465\u003c\/td\u003e\n        \u003ctd\u003eGM 502 V-8\u003c\/td\u003e\n        \u003ctd\u003e1990–1992\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0C849992-0F213244\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e500 Bulldog\u003c\/td\u003e\n        \u003ctd\u003e500\u003c\/td\u003e\n        \u003ctd\u003eGM 540 V-8\u003c\/td\u003e\n        \u003ctd\u003e1990–1996\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0C577254-0F745405\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e500 Bulldog\u003c\/td\u003e\n        \u003ctd\u003e500\u003c\/td\u003e\n        \u003ctd\u003eGM 540 V-8\u003c\/td\u003e\n        \u003ctd\u003e1999–2001\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0L414620-0M050281\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e502 MAG BRAVO\u003c\/td\u003e\n        \u003ctd\u003e502\u003c\/td\u003e\n        \u003ctd\u003eGM 502 V-8\u003c\/td\u003e\n        \u003ctd\u003e1990–1992\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0C878221-0D824588\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e525 SC\u003c\/td\u003e\n        \u003ctd\u003e525\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1991–1992\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0D456000-0F348963\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e525 SC (GEN. V)\u003c\/td\u003e\n        \u003ctd\u003e525\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1992–1995\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0D456000-0F348963\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e575\u003c\/td\u003e\n        \u003ctd\u003e575\u003c\/td\u003e\n        \u003ctd\u003eGM 540 V-8\u003c\/td\u003e\n        \u003ctd\u003e1986–1992\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0A677429-0D763716\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e600 SC\u003c\/td\u003e\n        \u003ctd\u003e600\u003c\/td\u003e\n        \u003ctd\u003eGM 502 V-8\u003c\/td\u003e\n        \u003ctd\u003e1991–1996\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0D456489-0F877642\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e7.4L BRAVO\u003c\/td\u003e\n        \u003ctd\u003e7.4L\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1988–1991\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0B771113-0D603117\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e7.4L MIE W\/B\/W\u003c\/td\u003e\n        \u003ctd\u003e7.4L\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1988–1992\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0B788366-0D715493\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e7.4L MIE W\/HURTH\u003c\/td\u003e\n        \u003ctd\u003e7.4L\u003c\/td\u003e\n        \u003ctd\u003eGM 454 V-8\u003c\/td\u003e\n        \u003ctd\u003e1989–1992\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0C391564-0D715493\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e8.2L MIE W\/HURTH\u003c\/td\u003e\n        \u003ctd\u003e8.2L\u003c\/td\u003e\n        \u003ctd\u003eGM 502 V-8\u003c\/td\u003e\n        \u003ctd\u003e1990–1992\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0C878221-0D857199\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e800 SC (GEN. V)\u003c\/td\u003e\n        \u003ctd\u003e800\u003c\/td\u003e\n        \u003ctd\u003eGM 572 V-8\u003c\/td\u003e\n        \u003ctd\u003e1993–1998\u003c\/td\u003e\n        \u003ctd\u003e27-54529\u003c\/td\u003e\n        \u003ctd\u003eSerial Range: 0D763836 and up\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eTiming Cover Gasket\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM replacement\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003ePaper\/Composite\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e13.0\" L × 10.0\" W × 1.13\" H\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.023 kg (0.05 lb)\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eCovered by a standard manufacturer warranty when purchased from an authorized dealer.\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Timing Cover Gasket (Replaces OEM #27-54529)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the negative battery terminal for safety.\u003c\/li\u003e\n  \u003cli\u003eDrain the engine coolant into a suitable container.\u003c\/li\u003e\n  \u003cli\u003eRemove any serpentine belts, pulleys, and accessories that block access to the timing cover.\u003c\/li\u003e\n  \u003cli\u003eRemove the crankshaft pulley\/harmonic balancer using an appropriate puller tool.\u003c\/li\u003e\n  \u003cli\u003eCarefully unbolt and remove the old timing cover. Note the location of different bolt lengths.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean all old gasket material and sealant from both the engine block and the timing cover mating surfaces.\u003c\/li\u003e\n  \u003cli\u003eAlign the new gasket on the timing cover. Apply sealant only if recommended by your engine's service manual.\u003c\/li\u003e\n  \u003cli\u003eReinstall the timing cover and tighten the bolts in the correct sequence to the manufacturer-specified torque.\u003c\/li\u003e\n  \u003cli\u003eReinstall the harmonic balancer, pulleys, and belts.\u003c\/li\u003e\n  \u003cli\u003eRefill the cooling system with the correct type and amount of coolant.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, start the engine, and carefully inspect for any oil or coolant leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if this gasket will fit my specific engine?\u003c\/summary\u003e\u003cp\u003eVerify your engine model, year, and serial number against the compatibility chart on this page. This gasket is a direct replacement for OEM part 27-54529, which is the most reliable way to confirm fitment for your Mercruiser Big Block V8 engine.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are common signs of a failed timing cover gasket?\u003c\/summary\u003e\u003cp\u003eThe most common symptoms are visible oil or coolant leaks from the front of the engine, around the edges of the timing cover. This can lead to engine overheating (if coolant is lost) or low oil pressure. You may also find coolant mixed in your engine oil, giving it a milky appearance.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs any sealant required with this gasket?\u003c\/summary\u003e\u003cp\u003eWhile this gasket is designed to seal effectively on its own, some mechanics apply a thin bead of RTV silicone sealant at critical points, such as where the oil pan and block meet the cover. Always consult your engine’s official service manual for the recommended procedure for your model.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow fast is shipping?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most regions. Expedited options, where available, will appear at checkout.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\u003cp\u003eThis part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window, provided the part is unused and in its original packaging. See our full policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify images and specifications against your original part before purchase. If anything differs—even if your model appears on the compatibility list—do not purchase.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is highly recommended for safety, performance, and to prevent engine damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions, with typical transit times of 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50596978164027,"sku":"27-54529","price":17.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/27-54529_cbd0e5bd-07b8-4ca9-8dc4-0eb0d8c5644e.jpg?v=1758448545"},{"product_id":"sea-water-pump-impeller-repair-kit-fits-mercruiser-bravo-alpha-1-2-3-replaces-47-59362t6","title":"Sea Water Pump Impeller Repair Kit – Fits MerCruiser Bravo, Alpha 1\/2\/3 (Replaces 47-59362T6)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eSea Water Pump Impeller Repair Kit\u003c\/strong\u003e is designed for a broad range of Mercury MerCruiser inboard and sterndrive engines, including 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L models manufactured from the 1980s through 2003 that are equipped with a one-piece plastic pump body and serpentine belt system.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Mercury part numbers 47-59362T6, 47-59362, 47-59362T1, 47-593621, 47-59362A1, 47-59362Q01, and interchanges with Sierra 18-3087, GLM 89740, Mallory 9-45375, and Jabsco 17954-0001-P.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eEngineered for engine-mounted raw water pumps with a one-piece plastic housing.\u003c\/li\u003e\n    \u003cli\u003eFeatures a durable neoprene impeller with a hardened nylon hub for longevity.\u003c\/li\u003e\n    \u003cli\u003eThe complete kit includes the impeller, face plate, and O-rings for a full service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-59362\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-59362T1\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-593621\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-59362A1\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-59362Q01\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3087\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e89740\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory\u003c\/td\u003e\n        \u003ctd\u003e9-45375\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJabsco\u003c\/td\u003e\n        \u003ctd\u003e17954-0001-P\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eThis impeller kit fits a wide range of MerCruiser engines from the early 1980s through 2003, specifically those equipped with a one-piece plastic raw water pump housing and serpentine belt system.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Compatible Engine Models for MerCruiser\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eMerCruiser 260\u003c\/td\u003e\n        \u003ctd\u003e260\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1981–1984\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eMerCruiser 340\u003c\/td\u003e\n        \u003ctd\u003e340\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1981–1987\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eMerCruiser 350 MAG\/MPI\/TBI\u003c\/td\u003e\n        \u003ctd\u003e350\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eMerCruiser 454 MAG\/SKI\/TBI\u003c\/td\u003e\n        \u003ctd\u003e454\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eInboard Engine 4.3L\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eUp to 2003\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003eSerpentine belt, one-piece housing\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eInboard Engine 5.0L\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eUp to 2003\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003eSerpentine belt, one-piece housing\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eInboard Engine 5.7L\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eUp to 2003\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003eSerpentine belt, one-piece housing\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eInboard Engine 7.4L\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eUp to 2003\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003eSerpentine belt, one-piece housing\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eInboard Engine 8.2L\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eUp to 2003\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003eSerpentine belt, one-piece housing\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eRace Stern Drive 320 efi\u003c\/td\u003e\n        \u003ctd\u003e320\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eRace Stern Drive 377 efi\u003c\/td\u003e\n        \u003ctd\u003e377\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eRace Stern Drives (420, 425, 450, 465, 500 efi, 525SC, 575, 600SC, 800SC)\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eStern Drive Alpha\/Bravo (200\/228\/230\/260\/262TBI\/300\/330\/350 MAG\/370\/372\/502MPI\/EFI\/MC1\/MC2)\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eUp to 2003\u003c\/td\u003e\n        \u003ctd\u003e47-59362T6\u003c\/td\u003e\n        \u003ctd\u003eOne-piece housing, serpentine belt\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eSea Water\/Raw Water Pump Impeller Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eEngine-mounted pumps with one-piece plastic body\u003c\/dd\u003e\n  \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene with hardened nylon hub\u003c\/dd\u003e\n  \u003cdt\u003eNumber of Blades\u003c\/dt\u003e\n\u003cdd\u003e8\u003c\/dd\u003e\n  \u003cdt\u003eShaft Type\u003c\/dt\u003e\n\u003cdd\u003eD-shaped shaft (Single Flat Drive)\u003c\/dd\u003e\n  \u003cdt\u003eImpeller Thickness\u003c\/dt\u003e\n\u003cdd\u003e2.01 inches (51.05 mm)\u003c\/dd\u003e\n  \u003cdt\u003eOverall Diameter\u003c\/dt\u003e\n\u003cdd\u003e2.64 inches (67.06 mm)\u003c\/dd\u003e\n  \u003cdt\u003eShaft Diameter\u003c\/dt\u003e\n\u003cdd\u003e0.75 inches (19.05 mm)\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.39 lbs (0.18 kg) \/ 90g\u003c\/dd\u003e\n  \u003cdt\u003eDimensions (L × W × H)\u003c\/dt\u003e\n\u003cdd\u003e4.5 × 2.63 × 4.88 inches (114.3 × 66.8 × 124.0 mm)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Water Pump Impeller (47-59362T6)\u003c\/li\u003e\n  \u003cli\u003e1 x Face Plate\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e2 x O-rings\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the boat's battery and close the water inlet seacock.\u003c\/li\u003e\n  \u003cli\u003eLocate the raw water pump housing on the engine.\u003c\/li\u003e\n  \u003cli\u003eLoosen and remove the screws holding the pump cover plate.\u003c\/li\u003e\n  \u003cli\u003eCarefully remove the old impeller using pliers or an impeller puller tool. Note the orientation of the blades for reinstallation.\u003c\/li\u003e\n  \u003cli\u003eClean the interior of the pump housing and the cover plate, removing any old gasket material or debris.\u003c\/li\u003e\n  \u003cli\u003eInspect the housing for scoring or cracks; replace the pump if significant wear is found.\u003c\/li\u003e\n  \u003cli\u003eInstall the new O-rings or gaskets, ensuring a proper seal.\u003c\/li\u003e\n  \u003cli\u003eLubricate the new impeller and the inside of the housing with a suitable marine lubricant.\u003c\/li\u003e\n  \u003cli\u003eInsert the new impeller, rotating the shaft in the direction of engine operation to bend the blades correctly.\u003c\/li\u003e\n  \u003cli\u003eReinstall the cover plate and tighten the screws in a star pattern to ensure even pressure.\u003c\/li\u003e\n  \u003cli\u003eOpen the seacock, reconnect the battery, and start the engine.\u003c\/li\u003e\n  \u003cli\u003eImmediately check the pump and hose connections for any water leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if this impeller fits my MerCruiser engine?\u003c\/summary\u003e\n  \u003cp\u003eTo confirm fitment, ensure your engine is a model from the 1980s to 2003 and is equipped with the one-piece plastic raw water pump body, which is typically used with a serpentine belt system. Always verify your specific model against the compatibility table provided on this page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing sea water pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eThe most common symptoms of a worn or damaged impeller are engine overheating, especially at idle or low speeds, a weak or non-existent stream of water from the exhaust outlet, and finding rubber fragments in the cooling system. Visible cracks, stiffness, or missing blades on the impeller itself are clear indicators for replacement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should I replace my engine's impeller?\u003c\/summary\u003e\n  \u003cp\u003eAs a crucial part of preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or after every 100-200 hours of engine operation. This interval may vary based on usage, water conditions (sandy or silty water causes faster wear), and manufacturer recommendations.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this impeller kit compatible with a two-piece bronze pump housing?\u003c\/summary\u003e\n  \u003cp\u003eNo, this particular repair kit is specifically designed for MerCruiser engines that use a one-piece plastic sea water pump body. It will not fit the older-style two-piece bronze pump housings.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the difference between an OEM and an aftermarket part?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is for an aftermarket replacement part, not an Original Equipment Manufacturer (OEM) component. It has been engineered to meet or exceed OEM-level specifications using comparable high-quality materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure consistent quality and performance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow much is shipping and how fast will it arrive?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free for most orders. Expedited shipping options, if available for your location, will be presented at checkout for an additional fee.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the warranty and return policy for this part?\u003c\/summary\u003e\n  \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal operating conditions. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard return window, provided the part is unused and in its original packaging. Please see our full policy page or reach out for detailed instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images and specifications against your original part before purchase. If anything differs—even if your model is listed as compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement part, not an OEM component. Brand names and part numbers are used for reference purposes only.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is highly recommended for safety and to ensure optimal performance of your engine's cooling system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and rigorously tested for demanding real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions, with an average transit time of 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with our manufacturing partners, we provide fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50602587849019,"sku":"47-59362T6","price":43.19,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/47-59362T6_13592fb1-2675-4d56-a531-f6b53dff1e8a.jpg?v=1758594858"},{"product_id":"exhaust-elbow-gasket-fits-mercruiser-v6-v8-engines-replaces-27-863724","title":"Exhaust Elbow Gasket (Restrictor) for MerCruiser V6\/V8 Engines – Replaces 27-41813, 27-860233 and 27-863724","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003erestrictor-style exhaust elbow gasket\u003c\/strong\u003e is designed for applicable MerCruiser V6 and V8 marine engines using a compatible center-riser exhaust arrangement. It installs between the exhaust manifold and riser or elbow to help seal the joint and regulate raw-water flow in systems that specify a restricted gasket.\u003c\/p\u003e\n\u003cp\u003eThe gasket replaces Mercury\/MerCruiser OEM references \u003cstrong\u003e27-41813\u003c\/strong\u003e, \u003cstrong\u003e27-860233\u003c\/strong\u003e, and \u003cstrong\u003e27-863724\u003c\/strong\u003e. The corresponding Sierra aftermarket reference is \u003cstrong\u003e18-0897\u003c\/strong\u003e. Catalog information identifies this restrictor gasket for use with compatible risers such as Sierra 18-1976-2 and 18-1970-2.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRestrictor-style exhaust elbow gasket for compatible wet-joint exhaust systems.\u003c\/li\u003e\n  \u003cli\u003eInstalls between the exhaust manifold and riser or elbow.\u003c\/li\u003e\n  \u003cli\u003eSuitable only when the engine and exhaust components call for this gasket style.\u003c\/li\u003e\n  \u003cli\u003eVerify the gasket shape, openings, riser application and part number before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThese references are provided for identification and interchange research. They do not replace confirmation of the complete exhaust-manifold and riser configuration.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eReference Type\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/MerCruiser\u003c\/td\u003e\n        \u003ctd\u003e27-41813\u003c\/td\u003e\n        \u003ctd\u003eOEM replacement reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/MerCruiser\u003c\/td\u003e\n        \u003ctd\u003e27-860233\u003c\/td\u003e\n        \u003ctd\u003eOEM replacement reference; restricted center-riser gasket\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/MerCruiser\u003c\/td\u003e\n        \u003ctd\u003e27-863724\u003c\/td\u003e\n        \u003ctd\u003eOEM replacement reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-0897\u003c\/td\u003e\n        \u003ctd\u003eAftermarket equivalent reference; restrictor gasket\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis gasket is associated with a range of MerCruiser V6 and V8 applications, but exact fitment depends on the exhaust manifold, riser or elbow design, gasket opening pattern and cooling configuration. Model, year and horsepower alone are not sufficient to confirm fitment.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Application Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eApplication\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eOEM Reference\u003c\/th\u003e\n        \u003cth\u003eApplication Notes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eApplicable V6 and V8 marine engines\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke gasoline marine engine\u003c\/td\u003e\n        \u003ctd\u003e27-41813, 27-860233, 27-863724\u003c\/td\u003e\n        \u003ctd\u003eUse only with a compatible wet-joint center-riser exhaust arrangement that specifies a restrictor gasket.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This listing does not establish fitment for every MerCruiser V6 or V8 engine, every production year, or every manifold and riser combination. Compare the removed gasket and verify the engine service-manual or parts-catalog requirement before installation.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eExhaust elbow gasket\u003c\/dd\u003e\n  \u003cdt\u003eGasket Style\u003c\/dt\u003e\n  \u003cdd\u003eRestrictor\u003c\/dd\u003e\n  \u003cdt\u003eInstallation Location\u003c\/dt\u003e\n  \u003cdd\u003eBetween the exhaust manifold and riser or elbow\u003c\/dd\u003e\n  \u003cdt\u003eCooling Application\u003c\/dt\u003e\n  \u003cdd\u003eCompatible raw-water wet-joint cooling systems that specify a restrictor gasket\u003c\/dd\u003e\n  \u003cdt\u003ePrimary Marine Application\u003c\/dt\u003e\n  \u003cdd\u003eMerCruiser V6 and V8 engines with compatible exhaust hardware\u003c\/dd\u003e\n  \u003cdt\u003eAftermarket Reference\u003c\/dt\u003e\n  \u003cdd\u003eSierra 18-0897\u003c\/dd\u003e\n  \u003cdt\u003eOEM Replacement References\u003c\/dt\u003e\n  \u003cdd\u003eMercury\/MerCruiser 27-41813, 27-860233 and 27-863724\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Restrictor exhaust elbow gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eOnly the gasket is included. Riser, elbow, manifold, mounting hardware, sealants and other service parts are not included unless specifically stated in the order details.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and allow the engine to cool completely before beginning work.\u003c\/li\u003e\n  \u003cli\u003eClose or drain the cooling system as required by the engine service manual.\u003c\/li\u003e\n  \u003cli\u003eDisconnect hoses and any sensors attached to the exhaust elbow or riser.\u003c\/li\u003e\n  \u003cli\u003eRemove the fasteners securing the riser or elbow to the exhaust manifold and carefully separate the components.\u003c\/li\u003e\n  \u003cli\u003eRemove all old gasket material and corrosion from both mating surfaces. Do not damage or distort the sealing faces.\u003c\/li\u003e\n  \u003cli\u003eCompare the new gasket with the removed gasket and confirm the bolt holes and water and exhaust passages are correctly aligned.\u003c\/li\u003e\n  \u003cli\u003eInstall the gasket in the orientation specified by the engine or exhaust-component service information.\u003c\/li\u003e\n  \u003cli\u003eReinstall the riser or elbow and tighten the fasteners in the specified sequence and to the manufacturer's torque specification.\u003c\/li\u003e\n  \u003cli\u003eReconnect hoses and sensors, restore the cooling system and inspect the assembly before starting the engine.\u003c\/li\u003e\n  \u003cli\u003eRun the engine carefully and check for exhaust, water or cooling leaks around the joint.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat does “restrictor” mean?\u003c\/summary\u003e\u003cp\u003eA restrictor gasket includes a restricted passage intended for exhaust systems and cooling configurations that require controlled water flow. Do not substitute an open gasket unless the engine and exhaust-manifold documentation specifically calls for it.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWill this fit every MerCruiser V6 or V8 engine?\u003c\/summary\u003e\u003cp\u003eNo. MerCruiser V6 and V8 engines use different manifold, riser, elbow and gasket configurations. Confirm the OEM reference, gasket shape and complete exhaust arrangement before ordering.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhich OEM numbers does this gasket replace?\u003c\/summary\u003e\u003cp\u003eCatalog references identify Mercury\/MerCruiser 27-41813, 27-860233 and 27-863724 as replacement references for this restrictor-style gasket.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhich risers are associated with this gasket?\u003c\/summary\u003e\u003cp\u003eCatalog information associates the gasket with compatible riser references including Sierra 18-1976-2 and 18-1970-2. Confirm the complete application before installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this gasket for a dry-joint exhaust system?\u003c\/summary\u003e\u003cp\u003eThis listing is intended for compatible traditional wet-joint exhaust arrangements. Dry-joint systems may use a different gasket design; compare the original part and service documentation before purchase.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDo I need one gasket per engine bank?\u003c\/summary\u003e\u003cp\u003eMany V6 and V8 exhaust systems use one manifold-to-riser gasket per cylinder bank, but the required quantity depends on the specific exhaust arrangement. Confirm the quantity needed for your engine before ordering.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM component?\u003c\/summary\u003e\u003cp\u003eNo. This is an aftermarket replacement gasket identified by the listed Mercury\/MerCruiser OEM references and the Sierra 18-0897 aftermarket reference.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the OEM reference, gasket profile, passage layout and exhaust-component application before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not use a restrictor gasket where the engine or exhaust system requires an open gasket, and do not use an open gasket where a restrictor is specified.\u003c\/li\u003e\n  \u003cli\u003eAllow the engine to cool before service and follow the manufacturer's torque and installation procedures.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when exhaust, cooling or manifold service procedures are unfamiliar.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Parts Focus\u003c\/strong\u003e — We supply replacement parts for marine engines and exhaust systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Conscious Listings\u003c\/strong\u003e — Part-number and configuration details are provided to help customers verify compatibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAftermarket Value\u003c\/strong\u003e — Replacement components are offered as practical alternatives to original service parts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723787374907,"sku":"HY-1TD8-ZNLD","price":17.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/HY-1TD8-ZNLD.png?v=1763031757"},{"product_id":"140-thermostat-kit-fits-mercruiser-v6-v8-engines-4-3-8-2l-replaces-807252q4-18-3668","title":"140°F Thermostat Kit for MerCruiser GM V6\/V8 Engines, 4.3L–8.2L","description":"\u003csection\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n  table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n  @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003e140°F thermostat kit\u003c\/strong\u003e is designed for selected MerCruiser GM V6 and V8 marine engines using a standard raw-water cooling system. It covers a range of 4.3L, 5.0L, 5.7L, 7.4L, 7.9L and 8.2L applications listed below. The thermostat opens at approximately 140°F (60°C) to help regulate engine operating temperature.\u003c\/p\u003e\n\u003cp\u003eThe kit is listed as a replacement for MerCruiser \u003cstrong\u003e807252Q4\u003c\/strong\u003e and \u003cstrong\u003e807252T4\u003c\/strong\u003e, Sierra \u003cstrong\u003e18-3668\u003c\/strong\u003e, GLM \u003cstrong\u003e13390\u003c\/strong\u003e, Quicksilver \u003cstrong\u003e75-03948\u003c\/strong\u003e and Barr \u003cstrong\u003e59137\u003c\/strong\u003e. Confirm the thermostat temperature, housing style and complete engine serial number before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e140°F (60°C) opening temperature.\u003c\/li\u003e\n  \u003cli\u003eFor selected standard raw-water cooling applications.\u003c\/li\u003e\n  \u003cli\u003eDesigned for specified MerCruiser GM V6 and V8 engines.\u003c\/li\u003e\n  \u003cli\u003eIncludes the thermostat and gasket components listed in the box contents below.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThese references are provided for cross-reference purposes. They should be checked against the engine model, serial number and cooling-system configuration.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e807252Q4 \/ 807252T4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3668\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e13390\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuicksilver\u003c\/td\u003e\n\u003ctd\u003e75-03948\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarr\u003c\/td\u003e\n\u003ctd\u003e59137\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe following MerCruiser applications and serial ranges are associated with the referenced thermostat application. Model, year, horsepower, displacement and serial conditions must be considered together. If your engine falls outside these listings, consult the engine service manual before purchasing.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eCID\/Liters\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eOEM Part No.\u003c\/th\u003e\n\u003cth\u003eSerial or application notes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e175 (V6)\u003c\/td\u003e\n\u003ctd\u003e175\u003c\/td\u003e\n\u003ctd\u003e262 (4.3L)\u003c\/td\u003e\n\u003ctd\u003e1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B527955–0B773242\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e185 (V6)\u003c\/td\u003e\n\u003ctd\u003e185\u003c\/td\u003e\n\u003ctd\u003e229\u003c\/td\u003e\n\u003ctd\u003e1983–1984\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e6330183–6919655\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e185 (V6)\u003c\/td\u003e\n\u003ctd\u003e185\u003c\/td\u003e\n\u003ctd\u003e262 (4.3L)\u003c\/td\u003e\n\u003ctd\u003e1985–1986\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0A331455–0B527954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e205 (V6)\u003c\/td\u003e\n\u003ctd\u003e205\u003c\/td\u003e\n\u003ctd\u003e262 (4.3L)\u003c\/td\u003e\n\u003ctd\u003e1985–1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B527955–0B775129\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4.3L (V6)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e262 (4.3L)\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B773243–0F601126\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4.3L\/LX (V6)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e262 (4.3L)\u003c\/td\u003e\n\u003ctd\u003e1993–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0F000878–0F601126\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e898 (V8)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e305 (5.0L)\u003c\/td\u003e\n\u003ctd\u003e1983–1984\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e6218462–689905\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e200 (V8)\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e305 (5.0L)\u003c\/td\u003e\n\u003ctd\u003e1985–1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e6899058–0B774444\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e228 (V8)\u003c\/td\u003e\n\u003ctd\u003e228\u003c\/td\u003e\n\u003ctd\u003e305 (5.0L)\u003c\/td\u003e\n\u003ctd\u003e1982–1984\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e6218462–6899268\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e230 (V8)\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003ctd\u003e305 (5.0L)\u003c\/td\u003e\n\u003ctd\u003e1985–1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e6899269–0B773739\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e230 MIE (V8)\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003ctd\u003e305 (5.0L)\u003c\/td\u003e\n\u003ctd\u003e1981–1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e5907058–0B78151\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5.0L (V8)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e305 (5.0L)\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B774445–0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5.0L MIE (V8)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e305 (5.0L)\u003c\/td\u003e\n\u003ctd\u003e1988\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B788152–0C396832\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5.0LX (V8)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e305 (5.0L)\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e5907058–0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e260 (V8)\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1982–1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e6218462–0B788151\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e260 MIE (V8)\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1981–1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e5907058–0B788151\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e300 (V8)\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1985–1986\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e6668677–0B430367\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e300 Mag (V8)\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1986–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0A635178–0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e350 MAG (V8)\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1986–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0A635178–0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e350 MAG (V8)\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B525982–0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e350 MAG Ski\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1991–1996\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0D505450–0K040399\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5.7L (V8)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B773305–0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5.7L MIE (V8)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B788152–0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5.7L Ski (V8)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e350 (5.7L)\u003c\/td\u003e\n\u003ctd\u003e1985–1995\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0A338533–0F775199\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e330 MIE (V8)\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e454 (7.4L)\u003c\/td\u003e\n\u003ctd\u003e1977–1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e4623115–0B816540\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e340 MIE (V8)\u003c\/td\u003e\n\u003ctd\u003e340\u003c\/td\u003e\n\u003ctd\u003e454 (7.4L)\u003c\/td\u003e\n\u003ctd\u003e1981–1992\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e5889914–0D715493\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e370 (V8)\u003c\/td\u003e\n\u003ctd\u003e370\u003c\/td\u003e\n\u003ctd\u003e454 (7.4L)\u003c\/td\u003e\n\u003ctd\u003e1985–1987\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e6721528–0B714586\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e454 MAG Alpha\/Bravo\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e454 (7.4L)\u003c\/td\u003e\n\u003ctd\u003e1986–1994\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0A631894–0F304999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e525 SC (V8)\u003c\/td\u003e\n\u003ctd\u003e525\u003c\/td\u003e\n\u003ctd\u003e454 (7.4L)\u003c\/td\u003e\n\u003ctd\u003e1991–1999\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0D456000–0L415623\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7.4L (V8)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e454 (7.4L)\u003c\/td\u003e\n\u003ctd\u003e1988–1994\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B771113–0F351999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7.4L MIE (V8)\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e454 (7.4L)\u003c\/td\u003e\n\u003ctd\u003e1988–1994\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0B788366–0F349999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e390 MCM \u0026amp; MIE\u003c\/td\u003e\n\u003ctd\u003e390\u003c\/td\u003e\n\u003ctd\u003e482 (7.9L)\u003c\/td\u003e\n\u003ctd\u003e1969–1970\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e2781129–3042731\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e460 (V8)\u003c\/td\u003e\n\u003ctd\u003e460\u003c\/td\u003e\n\u003ctd\u003e482 (7.9L)\u003c\/td\u003e\n\u003ctd\u003e1983–1986\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e4179554–6181046\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e465 (V8)\u003c\/td\u003e\n\u003ctd\u003e465\u003c\/td\u003e\n\u003ctd\u003e502 (8.2L)\u003c\/td\u003e\n\u003ctd\u003e1990–1994\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0C849992–0F213244\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e500, 500 EFI\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e502 (8.2L)\u003c\/td\u003e\n\u003ctd\u003e1994–2004\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0F213293 and later\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e502 MAG\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e502 (8.2L)\u003c\/td\u003e\n\u003ctd\u003e1990–1993\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0C878221–0F114528\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8.2L MIE\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003e502 (8.2L)\u003c\/td\u003e\n\u003ctd\u003e1990–1992\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003e0C878221–0D857199\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eEngine thermostat kit\u003c\/dd\u003e\n  \u003cdt\u003eThermostat Rating\u003c\/dt\u003e\n\u003cdd\u003e140°F (60°C)\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eSelected standard raw-water cooling systems\u003c\/dd\u003e\n  \u003cdt\u003eCompatibility\u003c\/dt\u003e\n\u003cdd\u003eSelected MerCruiser GM V6 and V8 engines from approximately 4.3L through 8.2L, subject to model and serial-number conditions\u003c\/dd\u003e\n  \u003cdt\u003eThermostat Diameter\u003c\/dt\u003e\n\u003cdd\u003eApproximately 54 mm\u003c\/dd\u003e\n  \u003cdt\u003eHousing or Sleeve\u003c\/dt\u003e\n\u003cdd\u003eA brass sleeve may be used on some applications, but it is not included unless specifically listed in the package contents\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × thermostat, referenced as 807252T1 \/ 59137\u003c\/li\u003e\n  \u003cli\u003e1 × O-ring, 25-30224\u003c\/li\u003e\n  \u003cli\u003e1 × gasket, 27-33179-2\u003c\/li\u003e\n  \u003cli\u003e1 × gasket, 27-47510\u003c\/li\u003e\n  \u003cli\u003e1 × gasket, 27-41812\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003csmall\u003eA brass sleeve such as 23-47508T is used on some applications but is not included in the listed contents of this kit. Reuse the original sleeve only if the engine requires one and it is in serviceable condition.\u003c\/small\u003e\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the boat battery and allow the engine to cool before beginning work.\u003c\/li\u003e\n  \u003cli\u003eDrain coolant or raw water from the thermostat housing area as required by the engine service procedure.\u003c\/li\u003e\n  \u003cli\u003eRemove the bolts securing the thermostat housing cover.\u003c\/li\u003e\n  \u003cli\u003eNote the orientation of the original thermostat, sleeve and gasket before removal.\u003c\/li\u003e\n  \u003cli\u003eRemove the old thermostat and clean the housing and engine mating surfaces.\u003c\/li\u003e\n  \u003cli\u003eInstall the new thermostat in the correct orientation with the appropriate new gasket or O-ring from the kit.\u003c\/li\u003e\n  \u003cli\u003eReinstall the housing cover and tighten the fasteners to the engine manufacturer's specified torque.\u003c\/li\u003e\n  \u003cli\u003eRestore the cooling system using the correct procedure for the engine's cooling configuration.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, start the engine and inspect carefully for leaks as it warms.\u003c\/li\u003e\n  \u003cli\u003eVerify that the engine reaches its expected operating temperature and that cooling water flow is normal.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know whether my engine needs a 140°F or another temperature thermostat?\u003c\/summary\u003e\u003cp\u003eThis kit is intended for applications specified for a 140°F thermostat. Some closed-cooling or freshwater-cooled configurations use a different temperature rating. Check the owner's or service manual and confirm the exact engine serial number before installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are common signs of a failing thermostat?\u003c\/summary\u003e\u003cp\u003eA thermostat stuck closed can contribute to overheating, while one stuck open can prevent the engine from reaching its intended operating temperature. Either condition can affect engine performance and cooling-system operation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhy are multiple gaskets included?\u003c\/summary\u003e\u003cp\u003eThe listed applications use different thermostat housing and sealing arrangements. The gasket assortment is intended to cover the specified applications; use only the gasket or O-ring that matches the engine housing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs the brass sleeve required?\u003c\/summary\u003e\u003cp\u003eNot every application uses a brass sleeve. Check the original assembly and the engine service manual. This kit includes only the parts listed in the box-contents section and does not include a brass sleeve unless separately stated.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\u003cp\u003eThis listing is for an aftermarket replacement kit. The cross-reference numbers identify the related OEM and aftermarket applications; they do not indicate that this kit is manufactured by MerCruiser or another OEM brand.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat should I verify before ordering?\u003c\/summary\u003e\u003cp\u003eVerify the engine brand, model, horsepower, displacement, stroke or engine configuration where applicable, cooling-system type, thermostat temperature and complete serial-number range. Do not rely on displacement alone because different production ranges can use different components.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the warranty?\u003c\/summary\u003e\u003cp\u003eWarranty coverage, if applicable, is governed by the seller's current warranty and returns policy. Review the policy in effect at the time of purchase.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eAlways compare the original thermostat, housing and sealing arrangement with the replacement before installation.\u003c\/li\u003e\n  \u003cli\u003eDo not install a 140°F thermostat in an application specified for a different temperature rating.\u003c\/li\u003e\n  \u003cli\u003eConfirm the complete engine serial number and cooling-system configuration before ordering.\u003c\/li\u003e\n  \u003cli\u003eUse the manufacturer's service procedure and specified fastener torque.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when the correct application or cooling-system configuration is uncertain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We supply replacement components for a range of marine engine and cooling-system applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Product references and fitment details are provided to help customers compare the replacement with the original part.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomer Support\u003c\/strong\u003e — When fitment is uncertain, provide the engine model, year and complete serial number before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723787440443,"sku":"23TH635R1","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/23TH635R1.png?v=1763031761"},{"product_id":"thermostat-repair-service-kit-fits-mercury-mercruiser-4-3l-5-0l-5-7l-7-4l-v6-v8-sterndrive-motors-replaces-807252q4-807252t4-807252t7-8m0089715","title":"Thermostat Service Kit for Mercury MerCruiser Sterndrive Engines – Replaces 807252Q4 and 807252T4","description":"\u003csection\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n  table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n  @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003ethermostat service kit\u003c\/strong\u003e is designed for selected Mercury MerCruiser sterndrive cooling-system applications. It provides a replacement thermostat together with the gaskets and O-ring needed to service the thermostat and housing sealing surfaces.\u003c\/p\u003e\n\u003cp\u003eThe kit replaces Mercury MerCruiser OEM part numbers \u003cstrong\u003e807252Q4\u003c\/strong\u003e and \u003cstrong\u003e807252T4\u003c\/strong\u003e. Confirm the engine model, cooling-system design, and serial-number range before ordering because thermostat and gasket requirements can vary between MerCruiser applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete thermostat service kit for the listed application.\u003c\/li\u003e\n  \u003cli\u003eIncludes one thermostat, three thermostat-cover gaskets, one O-ring, and one thermostat-housing gasket.\u003c\/li\u003e\n  \u003cli\u003eThermostat specification: approximately \u003cstrong\u003e142°F (61°C)\u003c\/strong\u003e nominal rating.\u003c\/li\u003e\n  \u003cli\u003eIntended for the corresponding MerCruiser sterndrive cooling-system configuration; it is not a universal V6\/V8 kit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThese are verified replacement and aftermarket reference numbers for this kit. Reference numbers identify the intended part relationship; they do not replace an application check.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eRole\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n\u003ctd\u003e807252Q4\u003c\/td\u003e\n\u003ctd\u003eOEM replacement reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n\u003ctd\u003e807252T4\u003c\/td\u003e\n\u003ctd\u003eOEM replacement reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3668\u003c\/td\u003e\n\u003ctd\u003eAftermarket thermostat kit reference\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eCompatibility must be confirmed using the complete engine model, cooling-system arrangement, and serial number. The replacement references above are associated with selected MerCruiser sterndrive thermostat-kit applications, but a general engine-family description alone is not sufficient to confirm fitment.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eCooling System\u003c\/th\u003e\n\u003cth\u003eThermostat Rating\u003c\/th\u003e\n\u003cth\u003eFitment Check\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eSelected sterndrive thermostat applications using OEM references 807252Q4 or 807252T4\u003c\/td\u003e\n        \u003ctd\u003eConfirm the specific raw-water or closed-cooling configuration before installation\u003c\/td\u003e\n        \u003ctd\u003eApproximately 142°F (61°C)\u003c\/td\u003e\n        \u003ctd\u003eVerify engine model and serial number against the applicable service catalog\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eThermostat service kit\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eSelected Mercury MerCruiser sterndrive cooling-system applications\u003c\/dd\u003e\n  \u003cdt\u003eNominal Thermostat Rating\u003c\/dt\u003e\n  \u003cdd\u003eApproximately 142°F (61°C)\u003c\/dd\u003e\n  \u003cdt\u003eOEM Replacement References\u003c\/dt\u003e\n  \u003cdd\u003e807252Q4 and 807252T4\u003c\/dd\u003e\n  \u003cdt\u003eAftermarket Reference\u003c\/dt\u003e\n  \u003cdd\u003eSierra 18-3668\u003c\/dd\u003e\n  \u003cdt\u003eFitment Requirement\u003c\/dt\u003e\n  \u003cdd\u003eMatch engine model, cooling-system configuration, and serial number before ordering\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Thermostat\u003c\/li\u003e\n  \u003cli\u003e1 x Thermostat cover gasket, reference 27-47510\u003c\/li\u003e\n  \u003cli\u003e1 x Thermostat cover gasket, reference 27-48818-1\u003c\/li\u003e\n  \u003cli\u003e1 x Thermostat cover gasket, reference 27-60208\u003c\/li\u003e\n  \u003cli\u003e1 x O-ring\u003c\/li\u003e\n  \u003cli\u003e1 x Thermostat housing gasket, reference 27-53045-1 or 27-33918\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eGasket shapes and required sealing locations depend on the corresponding housing design. Use only the gasket that matches the removed component and the service-manual installation arrangement.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eAllow the engine to cool completely before servicing the thermostat housing.\u003c\/li\u003e\n  \u003cli\u003eClose any seacock or isolate the water supply as required by the boat and engine service procedure.\u003c\/li\u003e\n  \u003cli\u003eLocate the thermostat housing and remove the cover or housing components according to the engine service manual.\u003c\/li\u003e\n  \u003cli\u003eRecord the original thermostat orientation before removal.\u003c\/li\u003e\n  \u003cli\u003eRemove the old thermostat, O-ring, and gaskets. Do not reuse compressed or damaged sealing components.\u003c\/li\u003e\n  \u003cli\u003eClean and dry the mating surfaces without scratching the housing or cover.\u003c\/li\u003e\n  \u003cli\u003eInstall the new thermostat in the original orientation and fit the appropriate new gaskets and O-ring from the kit.\u003c\/li\u003e\n  \u003cli\u003eReassemble the housing and tighten fasteners to the engine manufacturer’s specified torque.\u003c\/li\u003e\n  \u003cli\u003eRestore the cooling-water supply and operate the engine according to the service procedure.\u003c\/li\u003e\n  \u003cli\u003eCheck for leaks and confirm that the engine reaches and maintains its normal operating temperature.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eWhich OEM numbers does this kit replace?\u003c\/summary\u003e\u003cp\u003eThis kit is listed as a replacement for Mercury MerCruiser OEM numbers 807252Q4 and 807252T4.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat thermostat temperature rating is included?\u003c\/summary\u003e\u003cp\u003eThe associated thermostat is approximately 142°F (61°C). Do not substitute a different temperature rating unless it is specified for your exact engine application.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes the kit include the thermostat and seals?\u003c\/summary\u003e\u003cp\u003eYes. The kit includes one thermostat, three thermostat-cover gaskets, one O-ring, and one thermostat-housing gasket.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use this kit on any Mercury MerCruiser V6 or V8?\u003c\/summary\u003e\u003cp\u003eNo. MerCruiser thermostat designs and gasket requirements vary by engine model, cooling-system arrangement, and serial number. Confirm all three before ordering.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShould the old gaskets or O-ring be reused?\u003c\/summary\u003e\u003cp\u003eNo. Replace the removed sealing components with the matching new components supplied in the kit, and clean the mating surfaces before assembly.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM Mercury MerCruiser part?\u003c\/summary\u003e\u003cp\u003eThis listing is for an aftermarket service kit. The OEM numbers are provided as replacement references only.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWork only on a completely cool engine and follow the applicable marine-engine service procedure.\u003c\/li\u003e\n  \u003cli\u003eVerify the engine model, cooling-system configuration, serial number, thermostat rating, and gasket arrangement before purchase and installation.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on engine displacement or cylinder count alone to confirm fitment.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when the correct housing arrangement or cooling-system type is uncertain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We provide aftermarket components and service kits for common marine cooling-system repairs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — OEM replacement references are shown to help customers compare the part with the component being replaced.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation-Conscious Support\u003c\/strong\u003e — Always match the engine model, serial number, and cooling-system configuration before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723787473211,"sku":"GH-TH23635-M","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/GH-TH23635-M.png?v=1763031763"},{"product_id":"closed-riser-gasket-fits-mercruiser-gm-v6-v8-5-0l-8-2l-replaces-27-863725-27-41811","title":"Closed Riser Gasket Set for MerCruiser GM V6 \u0026 V8 5.0L–8.2L Engines – Replaces 27-863725 and 27-41811","description":"\u003csection\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n  table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n  @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eclosed riser gasket set\u003c\/strong\u003e is designed for MerCruiser stern-drive applications using GM V6 and V8 engines from 5.0L through 8.2L with a fresh-water, closed-cooling system. It is intended for exhaust manifolds and center-rise exhaust outlets used on applicable MerCruiser engines produced from the early 1980s through the 1990s and later applications that use the same gasket configuration.\u003c\/p\u003e\n\u003cp\u003eThe set is listed as a replacement for several OEM and aftermarket references, including Mercury MerCruiser \u003cstrong\u003e27-863725\u003c\/strong\u003e, \u003cstrong\u003e27-41811\u003c\/strong\u003e, \u003cstrong\u003e27-860231\u003c\/strong\u003e, Sierra \u003cstrong\u003e18-0672\u003c\/strong\u003e, and the additional references shown below. Confirm the gasket shape, bolt-hole pattern, cooling-system configuration, and existing part number before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for closed-riser, fresh-water cooling applications.\u003c\/li\u003e\n  \u003cli\u003eUsed at the connection between the exhaust manifold and center-rise outlet.\u003c\/li\u003e\n  \u003cli\u003eIncludes two gaskets for a complete installation.\u003c\/li\u003e\n  \u003cli\u003eFor applicable MerCruiser GM V6 and V8 engine configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the following references to compare the gasket with your existing part. Part-number cross-references should be confirmed against the physical gasket and engine configuration before installation.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n\u003ctd\u003e27-863725 \/ 27-8637251\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n\u003ctd\u003e27-41811\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n\u003ctd\u003e27-860231\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-0672\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarr\u003c\/td\u003e\n\u003ctd\u003eMC-20-87918 \/ MC-47-27-41811\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e30220\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOSCO\u003c\/td\u003e\n\u003ctd\u003e8503-GB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-61422\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUANOFCN\u003c\/td\u003e\n\u003ctd\u003e863725\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine and Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe applications below represent the listed MerCruiser compatibility range. Engine model, year, horsepower, and cooling-system configuration must be considered together. Always compare the original gasket before installation.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"MerCruiser Engine and Model Compatibility\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eOEM Part No.\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L\u003c\/td\u003e\n\u003ctd\u003e175–205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3LX\u003c\/td\u003e\n\u003ctd\u003e175–205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L LH\u003c\/td\u003e\n\u003ctd\u003e175–205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L LXH\u003c\/td\u003e\n\u003ctd\u003e175–205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L EFI\u003c\/td\u003e\n\u003ctd\u003e175–205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L MPI\u003c\/td\u003e\n\u003ctd\u003e175–205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e262 MAG\u003c\/td\u003e\n\u003ctd\u003e175–205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV6, 4.3L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1981–1986\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 305 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e228\u003c\/td\u003e\n\u003ctd\u003e228\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1981–1986\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 305 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1981–1986\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 305 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e230 MIE\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1981–1986\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 305 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1981–1986\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 350 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0L\u003c\/td\u003e\n\u003ctd\u003e200–260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 305 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0LX\u003c\/td\u003e\n\u003ctd\u003e200–260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 305 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e898\u003c\/td\u003e\n\u003ctd\u003e200–260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983–1984\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 305 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0L MPI\u003c\/td\u003e\n\u003ctd\u003e200–260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 305 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.7L\u003c\/td\u003e\n\u003ctd\u003e250–300\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 350 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e7.4L\u003c\/td\u003e\n\u003ctd\u003e330–340\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 454 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e8.2L\u003c\/td\u003e\n\u003ctd\u003e380–430\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 502 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e350 MAG\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-863725\u003c\/td\u003e\n\u003ctd\u003eV8, 350 CID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eClosed-riser exhaust manifold gasket set\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eFor applicable fresh-water, closed-cooling systems\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n  \u003cdd\u003eExhaust manifold to center-rise outlet\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n  \u003cdd\u003eMarine-grade gasket material\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eApplicable MerCruiser GM V6 and V8 configurations using the listed gasket pattern\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e Closed riser exhaust manifold gasket, replacing 27-863725 \/ 27-8637251 references\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and allow the engine to cool completely before beginning work.\u003c\/li\u003e\n  \u003cli\u003eDrain the cooling system as necessary so coolant does not spill excessively when the riser is removed.\u003c\/li\u003e\n  \u003cli\u003eDisconnect any hoses, sensors, or other components attached to the exhaust riser.\u003c\/li\u003e\n  \u003cli\u003eRemove the mounting bolts securing the riser to the manifold. Record the bolt positions and lengths for reassembly.\u003c\/li\u003e\n  \u003cli\u003eCarefully separate the riser from the manifold and account for residual coolant or water.\u003c\/li\u003e\n  \u003cli\u003eClean the manifold and riser mating surfaces thoroughly. Remove old gasket material, corrosion, and debris without damaging the sealing surfaces.\u003c\/li\u003e\n  \u003cli\u003ePosition the new gasket on the manifold, aligning all bolt holes and passages.\u003c\/li\u003e\n  \u003cli\u003eLower the riser into place and start the bolts by hand to avoid cross-threading.\u003c\/li\u003e\n  \u003cli\u003eTighten the bolts in the manufacturer's specified sequence and to the specified torque. Do not overtighten.\u003c\/li\u003e\n  \u003cli\u003eReconnect hoses and sensors, refill the cooling system, and reconnect the battery.\u003c\/li\u003e\n  \u003cli\u003eRun the engine and inspect the joint for exhaust, coolant, or water leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eUse the engine manufacturer's service manual for the correct torque values, tightening sequence, sealant requirements, and cooling-system refill procedure.\u003c\/p\u003e\n\n\u003ch2\u003eTroubleshooting and FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm that this gasket fits my engine?\u003c\/summary\u003e\u003cp\u003eVerify that your engine uses the listed fresh-water, closed-cooling configuration, then compare the engine model, year, horsepower, and existing part number with the compatibility table and part-number matrix. Also compare the physical gasket shape and bolt-hole pattern before installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the difference between a closed-riser gasket and an open gasket?\u003c\/summary\u003e\u003cp\u003eA closed-riser gasket is intended for the applicable closed-cooling exhaust configuration and does not use the same large raw-water passage arrangement found on some open or raw-water-cooled applications. The gasket must match the specific manifold, riser, and cooling-system design.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing riser gasket?\u003c\/summary\u003e\u003cp\u003ePossible signs include coolant or water leaking at the manifold-to-riser joint, exhaust leakage, steam, abnormal engine temperature, or water contamination in the engine oil. Stop operation and inspect the exhaust and cooling systems if any of these symptoms occur.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should riser gaskets be replaced?\u003c\/summary\u003e\u003cp\u003eInspect exhaust-manifold and riser joints during routine maintenance and whenever the riser or manifold is removed. Replacement intervals vary with use, storage, coolant condition, and exposure to salt water, so follow the engine manufacturer's service recommendations.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDo I need sealant with this gasket?\u003c\/summary\u003e\u003cp\u003eDo not apply sealant unless the engine or gasket manufacturer's service instructions specifically require it. Many exhaust gaskets are designed for dry installation, and excess sealant can interfere with proper seating or cooling passages.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I reuse the old riser bolts?\u003c\/summary\u003e\u003cp\u003eInspect all bolts for corrosion, damaged threads, stretching, or other wear. Replace any questionable fasteners and follow the service manual's requirements for bolt reuse and torque.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM component?\u003c\/summary\u003e\u003cp\u003eThis listing is for an aftermarket replacement gasket set and is not represented as a Mercury MerCruiser OEM component. The listed OEM and aftermarket numbers are provided as reference numbers for comparison.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the shipping and return terms?\u003c\/summary\u003e\u003cp\u003eStandard shipping and return eligibility are determined by the store policies shown at checkout and on the applicable policy pages. Product condition and packaging requirements may apply to returns.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety and Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the engine model, year, cooling-system type, gasket configuration, and existing part number before ordering.\u003c\/li\u003e\n  \u003cli\u003eDo not install this gasket on an application with a different passage layout or bolt-hole pattern.\u003c\/li\u003e\n  \u003cli\u003eAllow the engine to cool and disconnect the battery before service.\u003c\/li\u003e\n  \u003cli\u003eUse the manufacturer's service manual for torque values, tightening sequence, and installation requirements.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when working on marine exhaust or cooling systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine replacement parts selected for demanding real-world applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGlobal Fulfillment\u003c\/strong\u003e — Shipping options and estimated delivery times are shown at checkout where available.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — We aim to provide practical replacement solutions with clear application information.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723787637051,"sku":"R1-YADL-P5W3","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/R1-YADL-P5W3.png?v=1763031769"},{"product_id":"water-pump-impeller-kit-with-housing-fits-mercruiser-alpha-bravo-replaces-46-807151a14-807151a7","title":"Water Pump Kit for MerCruiser Bravo – Replaces 46-807151A14 and 46-807151A7","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis \u003cstrong\u003eWater Pump Kit for MerCruiser Bravo\u003c\/strong\u003e is an aftermarket replacement kit for Bravo applications that use the corresponding water-pump configuration. It replaces MerCruiser references \u003cstrong\u003e46-807151A14\u003c\/strong\u003e and \u003cstrong\u003e46-807151A7\u003c\/strong\u003e.\u003c\/p\u003e\n  \u003cp\u003eThe kit is listed as Sierra \u003cstrong\u003e18-3150\u003c\/strong\u003e in the referenced marine parts catalog. The catalog identifies the application as MerCruiser Bravo and lists the replacement components included in the kit.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eDesigned for the specified MerCruiser Bravo water-pump application.\u003c\/li\u003e\n    \u003cli\u003eProvides replacement wear plates, impeller, body gaskets, and water-pump gasket.\u003c\/li\u003e\n    \u003cli\u003eConfirm the existing pump configuration and part numbers before ordering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse these references to compare the kit with the part being replaced. Part-number references do not replace confirmation of the complete pump configuration.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand or Source\u003c\/th\u003e\n          \u003cth\u003ePart Number\u003c\/th\u003e\n          \u003cth\u003eReference Type\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3150\u003c\/td\u003e\n          \u003ctd\u003eWater pump kit reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e46-807151A14\u003c\/td\u003e\n          \u003ctd\u003eReplacement\/OEM reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e46-807151A7\u003c\/td\u003e\n          \u003ctd\u003eReplacement\/OEM reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eApplication\u003c\/h2\u003e\n  \u003cp\u003eThe referenced catalog identifies this water pump kit for \u003cstrong\u003eMerCruiser Bravo\u003c\/strong\u003e applications. The available reference does not establish a universal fit across all Bravo models, years, serial-number ranges, or pump housings.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003eApplication\u003c\/th\u003e\n          \u003cth\u003eConfirmed Reference\u003c\/th\u003e\n          \u003cth\u003eFitment Note\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003eBravo\u003c\/td\u003e\n          \u003ctd\u003e46-807151A14\u003c\/td\u003e\n          \u003ctd\u003eConfirm the pump configuration and existing part number before installation.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003eBravo\u003c\/td\u003e\n          \u003ctd\u003e46-807151A7\u003c\/td\u003e\n          \u003ctd\u003eConfirm the pump configuration and existing part number before installation.\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n    \u003cdd\u003eWater pump kit\u003c\/dd\u003e\n    \u003cdt\u003eApplication\u003c\/dt\u003e\n    \u003cdd\u003eMerCruiser Bravo water-pump applications\u003c\/dd\u003e\n    \u003cdt\u003eAftermarket Reference\u003c\/dt\u003e\n    \u003cdd\u003eSierra 18-3150\u003c\/dd\u003e\n    \u003cdt\u003eReplacement References\u003c\/dt\u003e\n    \u003cdd\u003eMerCruiser 46-807151A14 and 46-807151A7\u003c\/dd\u003e\n    \u003cdt\u003eHousing\u003c\/dt\u003e\n    \u003cdd\u003eHousing is not listed as included in the referenced kit contents.\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cp\u003eBased on the referenced catalog listing, the kit contains:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Wear Plate, reference 94576\u003c\/li\u003e\n    \u003cli\u003e1 x Wear Plate, reference 94916\u003c\/li\u003e\n    \u003cli\u003e1 x Water Pump Impeller, reference 47-59362\u003c\/li\u003e\n    \u003cli\u003e2 x Body Gasket, reference 27-94914\u003c\/li\u003e\n    \u003cli\u003e1 x Water Pump Gasket, reference 27-805215-1\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003eNot listed as included:\u003c\/strong\u003e water-pump housing, bolts, washers, or O-rings. Reuse or purchase additional components only if required by the specific pump assembly and service procedure.\u003c\/p\u003e\n\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eDisconnect the battery and allow the engine and cooling system to cool before servicing.\u003c\/li\u003e\n    \u003cli\u003eVerify that the existing pump assembly matches the Bravo application and replacement references listed above.\u003c\/li\u003e\n    \u003cli\u003eClose or drain the appropriate seacock and remove hoses or other components as required by the service manual.\u003c\/li\u003e\n    \u003cli\u003eRemove the pump cover or applicable pump components, keeping track of the original component order and gasket locations.\u003c\/li\u003e\n    \u003cli\u003eRemove the old impeller, wear plates, and gaskets. Inspect the housing and pump body for scoring, cracks, distortion, or corrosion.\u003c\/li\u003e\n    \u003cli\u003eClean all mating surfaces and remove old gasket material without damaging the sealing surfaces.\u003c\/li\u003e\n    \u003cli\u003eInstall the supplied wear plates, impeller, body gaskets, and water-pump gasket in the correct locations for the specific pump assembly.\u003c\/li\u003e\n    \u003cli\u003eLubricate the impeller with a suitable water-pump or glycerin-based lubricant before assembly. Do not run the pump dry.\u003c\/li\u003e\n    \u003cli\u003eReassemble the pump and tighten fasteners to the engine or pump manufacturer's specified torque.\u003c\/li\u003e\n    \u003cli\u003eReconnect hoses and open the seacock. Start the engine while monitoring cooling-water flow, temperature, and the pump area for leaks.\u003c\/li\u003e\n  \u003c\/ol\u003e\n  \u003cp\u003eAlways follow the service manual for the exact Bravo drive or engine configuration. If the pump housing or other reusable parts are damaged, additional replacement parts may be required.\u003c\/p\u003e\n\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I confirm that this kit fits my MerCruiser?\u003c\/summary\u003e\n    \u003cp\u003eConfirm that your existing water-pump assembly is a MerCruiser Bravo application and that its replacement reference is 46-807151A14 or 46-807151A7. Because Bravo configurations can vary, also compare the pump body, wear plates, gaskets, and impeller with the parts being removed.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this kit include the water-pump housing?\u003c\/summary\u003e\n    \u003cp\u003eNo. The referenced kit contents list wear plates, an impeller, body gaskets, and a water-pump gasket. A housing is not listed as included.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this kit include bolts or O-rings?\u003c\/summary\u003e\n    \u003cp\u003eBolts, washers, and O-rings are not listed in the referenced kit contents. Check the existing assembly and the applicable service manual to determine whether additional parts are needed.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the signs of a failing water-pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eCommon symptoms include overheating, reduced cooling-water flow, and visible cracks, tears, stiffness, or deformation in the old impeller. Inspect the wear plates and housing at the same time because damaged surfaces can shorten the life of a replacement impeller.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should the impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eInspect the impeller according to the engine manufacturer's maintenance schedule. Replacement intervals depend on operating hours, storage conditions, saltwater exposure, debris, and whether the pump has been run dry.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is for an aftermarket water pump kit. MerCruiser part numbers are provided as replacement references only; the kit is not represented as a genuine MerCruiser-manufactured component.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify the application and component configuration before ordering or installation.\u003c\/li\u003e\n    \u003cli\u003eDo not operate the engine without an adequate water supply to the pump.\u003c\/li\u003e\n    \u003cli\u003eReplace damaged housings, pump bodies, fasteners, seals, or other components as required by the service procedure.\u003c\/li\u003e\n    \u003cli\u003eUse the manufacturer's service manual for torque values, assembly order, and cooling-system bleeding procedures.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended when the correct pump configuration or installation procedure is uncertain.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMarine Parts Support\u003c\/strong\u003e — We provide replacement marine components with application references to help customers compare their existing parts.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFitment-Focused Listings\u003c\/strong\u003e — Confirm the model, pump configuration, and part-number references before ordering.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReplacement Value\u003c\/strong\u003e — Aftermarket alternatives can provide a practical solution when matched to the correct marine application.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723789799739,"sku":"JZ-0XNA-G8BA","price":30.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/JZ-0XNA-G8BA.png?v=1763031833"},{"product_id":"exhaust-elbow-gasket-fits-mercruiser-v6-v8-replaces-27-863724-27-41813-27-860233","title":"Restrictor Exhaust Elbow Gasket for MerCruiser V6 \u0026 V8 Stern Drive – Replaces 27-863724, 27-41813, 27-860233","description":"\u003csection\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n  table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n  @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003erestrictor-style exhaust elbow gasket\u003c\/strong\u003e is an aftermarket replacement for selected MerCruiser V6 and V8 stern-drive exhaust applications. It seals the joint between the exhaust manifold and riser or elbow and is intended for applications using the restrictor-style gasket pattern.\u003c\/p\u003e\n\u003cp\u003eCatalog references identify this restrictor gasket as Sierra 18-0897 and list it as replacing Mercury Marine references 27-41813, 27-860233, and 27-863724. Always compare the gasket pattern and cooling-system requirements with your original part before installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRestrictor-style exhaust elbow gasket.\u003c\/li\u003e\n  \u003cli\u003eFor selected MerCruiser V6 and V8 stern-drive applications.\u003c\/li\u003e\n  \u003cli\u003eDesigned for use with compatible riser and exhaust-elbow assemblies.\u003c\/li\u003e\n  \u003cli\u003eAftermarket replacement component; not an OEM Mercury Marine part.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThe following references are documented as replacement or equivalent catalog numbers for this gasket style.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand or Reference Type\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury Marine \/ MerCruiser OEM reference\u003c\/td\u003e\n\u003ctd\u003e27-863724\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury Marine \/ MerCruiser OEM reference\u003c\/td\u003e\n\u003ctd\u003e27-41813\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury Marine \/ MerCruiser OEM reference\u003c\/td\u003e\n\u003ctd\u003e27-860233\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra aftermarket reference\u003c\/td\u003e\n\u003ctd\u003e18-0897\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis gasket is associated with selected MerCruiser stern-drive exhaust systems using GM V6 and V8 engines. The available catalog relationship identifies compatible riser references rather than a complete engine model, year, horsepower, serial-number, or cooling-system list.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eEngine Type\u003c\/th\u003e\n\u003cth\u003eGasket Style\u003c\/th\u003e\n\u003cth\u003eAssociated Riser References\u003c\/th\u003e\n\u003cth\u003eFitment Note\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eSelected stern-drive exhaust systems\u003c\/td\u003e\n        \u003ctd\u003eGM V6 and V8\u003c\/td\u003e\n        \u003ctd\u003eRestrictor\u003c\/td\u003e\n        \u003ctd\u003e18-1976-2, 18-1970-2\u003c\/td\u003e\n        \u003ctd\u003eConfirm the original gasket pattern and cooling-system configuration before ordering.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eExhaust elbow gasket\u003c\/dd\u003e\n  \u003cdt\u003eGasket Style\u003c\/dt\u003e\n\u003cdd\u003eRestrictor-style\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eExhaust manifold to riser or elbow joint\u003c\/dd\u003e\n  \u003cdt\u003eEngine Application\u003c\/dt\u003e\n\u003cdd\u003eSelected MerCruiser V6 and V8 stern-drive systems\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement when the original gasket pattern and application match\u003c\/dd\u003e\n  \u003cdt\u003eAftermarket Reference\u003c\/dt\u003e\n\u003cdd\u003eSierra 18-0897\u003c\/dd\u003e\n  \u003cdt\u003eOEM References\u003c\/dt\u003e\n\u003cdd\u003e27-863724, 27-41813, 27-860233\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1 x\u003c\/strong\u003e Restrictor exhaust elbow gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRisers, exhaust elbows, bolts, plugs, and other installation hardware are not included unless specifically shown in the order details.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and allow the engine and exhaust system to cool completely.\u003c\/li\u003e\n  \u003cli\u003eDrain or contain the cooling water as required for your engine and remove the exhaust hose or connections that obstruct access.\u003c\/li\u003e\n  \u003cli\u003eUnbolt the riser or exhaust elbow and note the orientation of the original gasket.\u003c\/li\u003e\n  \u003cli\u003eClean both mating surfaces thoroughly. Remove old gasket material, corrosion, oil, and debris without damaging the sealing surfaces.\u003c\/li\u003e\n  \u003cli\u003eConfirm that the replacement gasket has the same restrictor pattern and orientation as the original application.\u003c\/li\u003e\n  \u003cli\u003eInstall the gasket, reinstall the riser or exhaust elbow, and tighten the fasteners according to the engine or component manufacturer's service procedure.\u003c\/li\u003e\n  \u003cli\u003eReconnect the exhaust hose and clamps, restore the cooling system, and inspect for water or exhaust leaks during the initial run.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an open-style or restrictor-style gasket?\u003c\/summary\u003e\u003cp\u003eThis is a restrictor-style gasket. Do not substitute it for an open or full-flow gasket unless that gasket style is specified for your exact engine and cooling-system configuration.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWill this fit every MerCruiser V6 or V8?\u003c\/summary\u003e\u003cp\u003eNo. It is intended for selected stern-drive exhaust applications. Engine family alone is not sufficient to confirm fitment; compare the original gasket pattern, riser or elbow arrangement, and cooling-system requirements.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhich part numbers does it replace?\u003c\/summary\u003e\u003cp\u003eAvailable catalog references list Mercury Marine or MerCruiser numbers 27-863724, 27-41813, and 27-860233, with Sierra aftermarket reference 18-0897. Verify the reference and gasket pattern before installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use this gasket with a closed cooling system?\u003c\/summary\u003e\u003cp\u003eDo not assume compatibility. Restrictor and open-style gaskets can serve different cooling-system requirements. Follow the engine manufacturer's service information and confirm the specified gasket style for your system.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failed exhaust elbow gasket?\u003c\/summary\u003e\u003cp\u003ePossible symptoms include water or exhaust leakage at the manifold-to-riser joint, overheating, steam, or visible corrosion around the sealing area. Stop operation and inspect the assembly if leakage is suspected.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM Mercury Marine part?\u003c\/summary\u003e\u003cp\u003eNo. This is an aftermarket replacement gasket referenced against the listed Mercury Marine or MerCruiser OEM numbers.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the gasket shape, openings, restrictor pattern, riser or elbow configuration, and cooling-system requirements before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on engine brand, displacement, or horsepower alone to confirm fitment.\u003c\/li\u003e\n  \u003cli\u003eUse the manufacturer's torque specifications and service procedures during installation.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended if the exhaust system, cooling system, or sealing surfaces require service.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWe supply replacement marine components for maintenance and repair applications.\u003c\/li\u003e\n  \u003cli\u003eProduct listings are organized around documented part-number and application references.\u003c\/li\u003e\n  \u003cli\u003eAlways compare the original component and confirm application details before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723794452795,"sku":"KF23GT303","price":17.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/KF23GT303.png?v=1763031948"}],"url":"https:\/\/seasierra.com\/collections\/mercruiser-4-stroke-340hp-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}