{"title":"MerCruiser 415HP 4-Stroke 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 415HP outboard engines and is designed to help you quickly find compatible parts and service information. Inside you’ll find maintenance tips, commonly replaced parts, and troubleshooting guidance. You can also browse the main \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\"\u003eMerCruiser collection\u003c\/a\u003e. Scroll to the bottom of this page to start browsing parts for this engine. On the collection page, use the “Filter \u0026amp; Sort” controls to narrow results by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block; padding:10px 16px; background:#0f766e; 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 415HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the engine serial plate: typically on the starboard side of the block, flame arrestor cover, or on the transom\/drive bracket. Record the full serial to confirm exact parts.\u003c\/li\u003e\n    \u003cli\u003eModel\/serial details often note induction type (EFI\/MPI), cooling (raw\/closed), and drive pairing. Suffixes may indicate accessory or emissions packages.\u003c\/li\u003e\n    \u003cli\u003eFor 4‑stroke V8 platforms, identify throttle body\/EFI labeling, coil‑on‑plug wiring, and accessory belt layout to distinguish variant generations.\u003c\/li\u003e\n    \u003cli\u003eNote control and rigging details (digital\/analog gauges, control type) and prop specification; these affect compatible electrical and propulsion 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\/Platform Overview\u003c\/h2\u003e\n  \u003ch3\u003eV8 EFI 4‑Stroke Platform (High‑Output ~415 HP)\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;\"\u003eV8 gasoline, electronically fuel injected 4‑stroke with serpentine accessory drive; raw or closed‑cooling variants.\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;\"\u003eHigh‑output V8 packages in the ~400–430 HP class. Exact parts coverage depends on engine serial, cooling type, and drive pairing.\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;\"\u003eStrong mid‑range torque, clean running 4‑stroke operation, and robust charging capacity for onboard electronics.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eCooling, ignition, and fuel components can differ by serial range. Always verify against the engine serial plate before ordering.\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 for 4‑stroke marine V8s. Always follow the official service manual for your exact serial range and operating 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 (25 hrs first service)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eUse marine‑rated 4‑stroke oil and the correct spin‑on filter for your serial.\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)\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;\"\u003eInspect for water intrusion and metal; change more often in heavy use.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/lower-unit-seal-kits\"\u003eLower Unit Seal Kits\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;\"\u003eInspect 100 hrs; replace 300 hrs or as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eCheck gap and heat range specified for your engine family.\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;\"\u003eInspect 50 hrs; replace 100 hrs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eReplace sooner with any sign of water, varnish, or pressure drop.\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;\"\u003eRaw water pump impeller\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;\"\u003eService more frequently in sandy\/silty or high‑temperature operation.\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;\"\u003eThermostat\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eInspect every 2 seasons; replace as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eOverheating or cold‑running can indicate thermostat issues.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\"\u003eMerCruiser Parts (All)\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eAnodes (zinc\/aluminum\/magnesium)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eInspect 50 hrs; replace when ~50% depleted\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eMatch anode alloy to your water (salt\/brackish\/fresh) for best protection.\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      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eSerpentine\/accessory belt\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eInspect 100 hrs; replace 300 hrs or if cracked\/glazed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eProper belt tension is critical for charging and cooling performance.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\"\u003eAccessory Belts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eComprehensive service kits\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003ePer seasonal\/annual schedule\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eBundle essentials (filters, anodes, gaskets) by engine family.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-service-maintenance-kits\"\u003eMerCruiser Service \u0026amp; Maintenance Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n  \u003cp style=\"font-size:12px; color:#475569; margin-top:8px;\"\u003e*Intervals are general recommendations; adjust for heavy use or harsh conditions.\u003c\/p\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\/water-pumps\"\u003eWater Pumps\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\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eAlternators \u0026amp; Charging – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-alternators\"\u003eMerCruiser Alternators\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\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;\"\u003eWeak cooling water stream \/ overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eInspect intake screens\/strainer, hose kinks, and raw‑water impeller; verify thermostat operation.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eWater pump impeller kit, thermostat, intake screens, anodes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eCheck fuel quality, water separator, and spark plugs; inspect prop for damage or over‑pitching.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eFuel filter\/water separator, spark plugs, propeller\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eVerify battery state and grounds, inspect plugs and ignition leads, check for vacuum leaks and contaminated fuel.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eSpark plugs, electrical items, fuel filters, gaskets\/hoses\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eGearcase noise \/ metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eConfirm oil level and color; check for water intrusion via seals; listen for bearing\/gear whine.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f1f5f9;\"\u003eGear lube, seals, bearings, propeller hub components\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eCharging system warning \/ low voltage\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eInspect belt tension, alternator output, battery condition, and main grounds.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eAlternator, accessory belt, electrical connectors\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 between different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eSome service items (filters, anodes, belts) may cross between years, but many cooling, ignition, and fuel components change with serial updates and package options. Always confirm by engine serial before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the raw‑water impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule of thumb, replace annually or every 100 hours—sooner in sandy, silty, or high‑temperature environments. Any overheat event or dry‑run warrants immediate inspection.\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 at least every 100 hours or at the end of each season. Inspect for water intrusion (milky oil) or metal debris; address seal or bearing issues before further use.\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\u003eProvide the engine brand, horsepower, complete serial number, cooling type (raw\/closed), and details on the drive\/prop. Photos of the serial plate and the part being replaced help ensure an exact match.\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 by horsepower, year, and model? Browse the full MerCruiser catalog and refine with the Filter \u0026amp; Sort tools.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block; padding:10px 16px; background:#0f766e; color:#fff; text-decoration:none; border-radius:6px;\"\u003eBrowse All MerCruiser Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px; font-size:12px; color:#475569;\"\u003eIf you’re unsure about your model, send us a clear photo of the serial\/nameplate and the part you need—we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"mechanical-fuel-pump-fits-mercruiser-v8-454-502-cid-7-4l-8-2l-replaces-861677t","title":"Mechanical Fuel Pump – Fits MerCruiser V8 454\/502 CID (7.4L\/8.2L) (Replaces 861677T)","description":"\u003csection id=\"product-details\"\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis is an aftermarket \u003cstrong\u003eMechanical Fuel Pump – Fits MerCruiser V8 454\/502 CID (7.4L\/8.2L) (Replaces 861677T)\u003c\/strong\u003e, designed for V-8 MerCruiser stern drive and inboard engines with 454 and 502 CID (7.4L and 8.2L) GM blocks. It is engineered for applications using a sea water pump with a mounted mechanical fuel pump.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Mercury\/Quicksilver part numbers 861677T, 818383T, and Sierra 18-8860.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Mounts directly onto the sea-pump assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel System:\u003c\/strong\u003e Designed for gasoline-fueled engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Includes:\u003c\/strong\u003e Comes with the required mounting gasket for a complete installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\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\u003csection id=\"part-number-matrix\"\u003e\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 \/ Quicksilver\u003c\/td\u003e\n        \u003ctd\u003e861677T\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Quicksilver\u003c\/td\u003e\n        \u003ctd\u003e818383T\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-8860\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-compatibility\"\u003e\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 fuel pump is compatible with specific General Motors big block engines used by MerCruiser. Verify your model and original part number before ordering.\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\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\u003eV8 454 CID\u003c\/td\u003e\n        \u003ctd\u003e330-385\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e861677T\u003c\/td\u003e\n        \u003ctd\u003eGM Big Block\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eV8 502 CID\u003c\/td\u003e\n        \u003ctd\u003e415-425\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e861677T\u003c\/td\u003e\n        \u003ctd\u003eGM Big Block\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\u003e330-385\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e861677T\u003c\/td\u003e\n        \u003ctd\u003eGM Big Block\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\u003e415-425\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e861677T\u003c\/td\u003e\n        \u003ctd\u003eGM Big Block\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"technical-specs\"\u003e\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eMechanical Fuel Pump\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eSea-pump mounted\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eGasoline\u003c\/dd\u003e\n  \u003cdt\u003eConnection Orientation\u003c\/dt\u003e\n\u003cdd\u003eInlet at 9 o'clock, Outlet at 6 o'clock\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eMetal\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eSilver\/Chrome\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003eL: 165mm × W: 120mm × H: 120mm\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.79 kg (1.74 lbs)\u003c\/dd\u003e\n  \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eFlange Mount\u003c\/dd\u003e\n  \u003cdt\u003eOther Attributes\u003c\/dt\u003e\n\u003cdd\u003eFor use on sea water pumps with mechanical fuel pump mounted applications\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 year factory warranty against defects and workmanship\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"whats-in-the-box\"\u003e\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 Fuel Pump Assembly (861677T)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e Gasket (27-34213)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"installation-notes\"\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and relieve any pressure from the fuel system.\u003c\/li\u003e\n  \u003cli\u003ePlace absorbent rags under the fuel lines to catch any spills.\u003c\/li\u003e\n  \u003cli\u003eCarefully disconnect the inlet and outlet fuel lines from the pump.\u003c\/li\u003e\n  \u003cli\u003eRemove the mounting bolts that secure the old fuel pump to the engine block or sea-pump.\u003c\/li\u003e\n  \u003cli\u003eRemove the old pump and gasket. Thoroughly clean the mounting surface to ensure a proper seal.\u003c\/li\u003e\n  \u003cli\u003ePlace the new gasket onto the mounting surface.\u003c\/li\u003e\n  \u003cli\u003eInstall the new fuel pump and tighten the mounting bolts to the manufacturer's recommended torque.\u003c\/li\u003e\n  \u003cli\u003eReconnect the fuel lines securely.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, prime the fuel system, and start the engine. Check carefully for any fuel leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\"\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if this fuel pump fits my MerCruiser engine?\u003c\/summary\u003e\n  \u003cp\u003eThis pump is designed for MerCruiser V8 454\/502 CID (7.4L\/8.2L) GM engines where the mechanical fuel pump is mounted on the sea water pump. The best way to confirm fitment is to match your original part number to the ones listed: 861677T, 818383T, or Sierra 18-8860. Also, check the connection orientation (inlet at 9 o'clock, outlet at 6 o'clock).\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the common signs of a failing mechanical fuel pump?\u003c\/summary\u003e\n  \u003cp\u003eSymptoms of a bad fuel pump include engine sputtering at high speeds, loss of power, difficulty starting, or engine stalling. You might also notice fuel leaking from the pump housing, which is a serious safety hazard and requires immediate attention.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should a mechanical fuel pump be replaced?\u003c\/summary\u003e\n  \u003cp\u003eThere is no fixed replacement interval for mechanical fuel pumps. They are typically replaced when they fail or show signs of wear. Regular inspection for leaks and performing fuel pressure tests during routine maintenance can help identify a weakening pump before it fails completely.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this a difficult part to install?\u003c\/summary\u003e\n  \u003cp\u003eFor someone with intermediate mechanical skill, the replacement is straightforward. It requires basic hand tools, care in handling fuel lines, and ensuring the mounting surface is clean for a good seal. However, due to the fire risk associated with fuel systems, professional installation is always recommended if you are not completely comfortable with the process.\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). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility and batch-inspected for consistency and reliability.\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 is 5–15 days. Standard shipping is free, and expedited options may be available at checkout depending on your location.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty \u0026amp; returns?\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\u003c\/section\u003e\n\n\u003csection id=\"safety-info\"\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 compatible—do not order.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component, not an OEM part.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"about-us\"\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 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 quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50587184857403,"sku":"861677T","price":291.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/861677T_3046d201-cac8-44a2-bd3f-bcc680039f42.jpg?v=1757934197"},{"product_id":"carburetor-to-intake-manifold-gasket-fits-mercury-mercruiser-v6-v8-engines-replaces-27-524572","title":"Carburetor to Intake Manifold Gasket – Fits Mercury MerCruiser V6\/V8 Engines (Replaces 27-524572)","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\u003eCarburetor to Intake Manifold Gasket\u003c\/strong\u003e creates a crucial seal between the carburetor and intake manifold on specific Mercury MerCruiser engines. It is designed for V6 262 CID (4.3L) and V8 305\/350\/454\/502 CID (5.0L\/5.7L\/7.4L\/8.2L) models manufactured between 1986 and 1998.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Mercury part numbers 27-524572, 524571, and 52457, and interchanges with Sierra 18-2848, GLM 30380, Red Rhino MR-F12, and EMP 27-00359.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstalls between the carburetor and intake manifold.\u003c\/li\u003e\n\u003cli\u003eDesigned for Rochester and Weber 4-barrel carburetors.\u003c\/li\u003e\n\u003cli\u003eMade from durable paper\/composite material to ensure a reliable seal.\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        \u003cth\u003eNotes\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\u003e27-524572\u003c\/td\u003e\n        \u003ctd\u003eSupersedes 27-524571 and 27-52457\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-2848\u003c\/td\u003e\n        \u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e30380\u003c\/td\u003e\n        \u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eRed Rhino\u003c\/td\u003e\n        \u003ctd\u003eMR-F12\u003c\/td\u003e\n        \u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eEMP\u003c\/td\u003e\n        \u003ctd\u003e27-00359\u003c\/td\u003e\n        \u003ctd\u003eAftermarket Replacement\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 Mercury MerCruiser Engines: This part fits a wide range of sterndrive and inboard models. Please verify your engine's serial number falls within the specified range for a guaranteed match.\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\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\u003e175 (2 BBL.) GM 262 V-6\u003c\/td\u003e\n\u003ctd\u003e175\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B527955-0B773242\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e205 (4 BBL.) GM 262 V-6\u003c\/td\u003e\n\u003ctd\u003e205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B527955-0B775129\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4.3L (2 BBL.) GM 262 V-6\u003c\/td\u003e\n\u003ctd\u003e190\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1992\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B773243-0D714106\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4.3L (GEN+) (2 BBL.) GM 262 V-6\u003c\/td\u003e\n\u003ctd\u003e190\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1998\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0L010044-0M614999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4.3L (GEN+) (4BBL) Reman\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1998+\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 1G400000 \u0026amp; Up\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4.3L (GEN II) (2 BBL.) GM 262 V-6\u003c\/td\u003e\n\u003ctd\u003e190\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1996\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0D714107-0F802999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4.3LX (4 BBL.) GM 262 V-6\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1992\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B775130-0D714369\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4.3LX (GEN+) (2 BBL.) GM 262 V-6\u003c\/td\u003e\n\u003ctd\u003e190\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996–1997\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0F803000-0K999999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4.3LX (GEN II) (4 BBL.) GM 262 V-6\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1996\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0D714370-0F802999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e4.3LH\/LXH (GEN+) (4 BBL.) GM 262 V-6\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1996–1998\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0F803114-0M614999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e200\/230\/260 (2\/4 BBL.) GM 305 V-8\u003c\/td\u003e\n\u003ctd\u003e200-260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B525982-0B774444\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e5.0L (2 BBL.) GM 305 V-8\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B774445-0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e5.0L MIE (4 BBL.) GM 305 V-8\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B522506-0B788151\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e5.0LX (4 BBL.) GM 305 V-8\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1995\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B773740-0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e260 MIE\/350 MAG. ALPHA GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e260-300\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B522506-0F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e5.7L\/5.7LX (2\/4 BBL.) GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e250-280\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1997\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B525982-0K999999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e5.7L MIE GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1997\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B788197-0K999999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e5.7L\/LX EFI (TBI) GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e250-280\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1995–1997\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eFor TBI models\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e350 MAG (SKI) GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1991–1997\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0D505450-0K999999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e350 MAG. EFI SKI (TBI) GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1994–1996\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0F215561-0F820706\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e5.7L COMPETITION SKI GM 350 V-8\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1995\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B514627-0F775199\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e454 MAG. ALPHA GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1988\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0A631894-0B785148\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\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\u003e1988–1994\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B721206-0F304999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e7.4L BRAVO GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1988–1996\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0B771113-0F800699\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e7.4L MIE W\/HURTH GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989–1992\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0C391564-0D715493\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e7.4L MIE (LH) GEN. V\/VI GM 454 V-8\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1992–1997\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0D715494-0K999999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e502 MAG. BRAVO GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e415\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–1993\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 0C878221-0F114528\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003e8.2L MIE W\/HURTH GM 502 V-8\u003c\/td\u003e\n\u003ctd\u003e415\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990–1992\u003c\/td\u003e\n\u003ctd\u003e27-524572\u003c\/td\u003e\n\u003ctd\u003eSerial: 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\u003eCarburetor to Intake Manifold Gasket\u003c\/dd\u003e\n  \u003cdt\u003eInstallation Location\u003c\/dt\u003e\n\u003cdd\u003eBetween carburetor and intake manifold\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eGasoline\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003ePaper\/Composite\u003c\/dd\u003e\n  \u003cdt\u003eDesign Compatibility\u003c\/dt\u003e\n\u003cdd\u003eDesigned for use with Rochester and Weber 4-barrel carburetors\u003c\/dd\u003e\n  \u003cdt\u003eProduct Dimensions\u003c\/dt\u003e\n\u003cdd\u003e6.0\" H x 9.31\" W x 1.13\" L\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 Carburetor to Intake Manifold Gasket (27-524572)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the negative battery terminal and relieve any pressure from the fuel system.\u003c\/li\u003e\n  \u003cli\u003eRemove the flame arrestor and air cleaner assembly from the top of the carburetor.\u003c\/li\u003e\n  \u003cli\u003eCarefully disconnect all fuel lines, vacuum hoses, throttle linkages, and electrical connectors from the carburetor.\u003c\/li\u003e\n  \u003cli\u003eRemove the carburetor mounting bolts or nuts and lift the carburetor straight up and off the intake manifold.\u003c\/li\u003e\n  \u003cli\u003eRemove the old gasket. Thoroughly clean both the carburetor base and the intake manifold mating surfaces of any old gasket material or debris.\u003c\/li\u003e\n  \u003cli\u003ePlace the new gasket onto the intake manifold, ensuring all bolt holes and bores align correctly.\u003c\/li\u003e\n  \u003cli\u003eCarefully lower the carburetor back onto the new gasket.\u003c\/li\u003e\n  \u003cli\u003eTighten the mounting bolts in a crisscross pattern to the manufacturer's recommended torque specification to ensure an even seal.\u003c\/li\u003e\n  \u003cli\u003eReconnect all fuel lines, linkages, hoses, and electrical connectors.\u003c\/li\u003e\n  \u003cli\u003eReinstall the flame arrestor assembly, reconnect the battery, and carefully check for any fuel leaks before starting the engine.\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 I need to replace my carburetor gasket?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs of a faulty gasket include a rough or unstable idle, engine stalling, a distinct hissing sound indicating a vacuum leak near the carburetor base, and reduced fuel efficiency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this fit my engine if it's not on the compatibility list?\u003c\/summary\u003e\n  \u003cp\u003eWe can only guarantee fitment for the specific models, years, and serial number ranges provided in the compatibility table. Using this part on an unlisted model is not recommended and may result in improper sealing.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the difference between this gasket and the OEM part?\u003c\/summary\u003e\n  \u003cp\u003eThis aftermarket gasket is manufactured to meet or exceed original equipment (OEM) specifications for fit, form, and function. It is made from comparable high-quality materials to provide a reliable seal at a more accessible price point.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should this gasket be replaced?\u003c\/summary\u003e\n  \u003cp\u003eThis gasket should be replaced any time the carburetor is removed from the intake manifold. Gaskets are designed for single use and compress to create a seal; reusing an old one significantly increases the risk of leaks.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I use sealant with this gasket?\u003c\/summary\u003e\n  \u003cp\u003eGenerally, it's best to install this type of gasket dry, as it is designed to seal on its own. Applying sealant can sometimes cause the gasket to slide out of place during installation or interfere with proper sealing. Always follow the engine manufacturer's service manual recommendations.\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":50590214914363,"sku":"27-524572","price":9.89,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/27-524572_5c9d607b-0552-465d-9d2e-5423070f5153.jpg?v=1758080313"},{"product_id":"160-thermostat-kit-fits-mercruiser-4-3l-5-0l-5-7l-7-4l-v6-v8-engines-replaces-807252q5","title":"160° Thermostat Kit – Fits MerCruiser 4.3L, 5.0L, 5.7L, 7.4L V6\/V8 Engines (Replaces 807252Q5)","description":"\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\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis \u003cstrong\u003e160° Thermostat Kit – Fits MerCruiser 4.3L, 5.0L, 5.7L, 7.4L V6\/V8 Engines (Replaces 807252Q5)\u003c\/strong\u003e is designed for MerCruiser inboard and sterndrive engines with V6 and V8 configurations that require a 160° thermostat. It is primarily for 4.3L, 5.0L, 5.7L, and 7.4L\/8.2L engines from 1987 and newer.\u003c\/p\u003e\n  \u003cp\u003eThis kit serves as a direct replacement for MerCruiser part numbers 807252Q5, 807252T8, 807252T5, as well as aftermarket equivalents like Sierra 18-3647 and Engineered Marine Products 807252Q5.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eEngineered for direct replacement installation.\u003c\/li\u003e\n    \u003cli\u003eMaintains optimal engine temperature for raw water cooled systems.\u003c\/li\u003e\n    \u003cli\u003eIncludes thermostat, plastic housing sleeve, and all necessary gaskets for a complete service.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\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\u003e807252Q5\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e807252T8\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e807252T5\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3647\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eEngineered Marine Products\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eConfirm your engine model\/year in the table below.\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, 4.3LX, 4.3LXH Alpha\u003c\/td\u003e\n          \u003ctd\u003e190\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F601127-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e4.3L, 4.3LX, 4.3LXH Bravo\u003c\/td\u003e\n          \u003ctd\u003e190\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F601127-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e4.3L, 4.3LX GM\u003c\/td\u003e\n          \u003ctd\u003e190\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1993–1995\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F000878-0F601126\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e4.3L, 4.3LH, 4.3EFI Alpha\u003c\/td\u003e\n          \u003ctd\u003e190\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0L010044 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e4.3L, 4.3LH, 4.3EFI Bravo\u003c\/td\u003e\n          \u003ctd\u003e190\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0L010044 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.0L, 5.0LX GM\u003c\/td\u003e\n          \u003ctd\u003e220\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1987–1995\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0B525982-0F600999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.0L, 5.0EFI Alpha\u003c\/td\u003e\n          \u003ctd\u003e220\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0L012052 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.0L, 5.0EFI Bravo\u003c\/td\u003e\n          \u003ctd\u003e220\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0L012052 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.7L, 5.7LX GM\u003c\/td\u003e\n          \u003ctd\u003e260\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1987–1995\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0B525982-0F600999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.7L GM Alpha\u003c\/td\u003e\n          \u003ctd\u003e260\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1995–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F225560-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.7L GM Bravo\u003c\/td\u003e\n          \u003ctd\u003e260\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1995–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F225560-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.7L, 5.7EFI GM Alpha\u003c\/td\u003e\n          \u003ctd\u003e260\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0L010037 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.7L, 5.7EFI GM Bravo\u003c\/td\u003e\n          \u003ctd\u003e260\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0L010037 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.7L M IE\u003c\/td\u003e\n          \u003ctd\u003e260\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1994–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F025000-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e5.7L M IE\u003c\/td\u003e\n          \u003ctd\u003e260\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0L002003 \u0026amp; Up\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\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1987–1998\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0B514627 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e262 MAG Alpha\u003c\/td\u003e\n          \u003ctd\u003e260\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F803800-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e262 MAG Bravo\u003c\/td\u003e\n          \u003ctd\u003e260\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F803800-0K999999\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\u003e1987–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0B525982-0F600999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e350 MAG EFI Ski\u003c\/td\u003e\n          \u003ctd\u003e300\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1994–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0D505450-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e350 MAG MPI \/ M IE\u003c\/td\u003e\n          \u003ctd\u003e300\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0L010019 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e350 MAG MPI Ski\u003c\/td\u003e\n          \u003ctd\u003e300\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1995–1998\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F350583 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e350 MAG Ski\u003c\/td\u003e\n          \u003ctd\u003e300\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1991–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0D505450-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e454 MAG MCM \/ Ski\u003c\/td\u003e\n          \u003ctd\u003e385\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1995–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F305000-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e7.4L, 7.4LX GM\u003c\/td\u003e\n          \u003ctd\u003e330\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F352000-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e7.4L M IE\u003c\/td\u003e\n          \u003ctd\u003e330\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1989–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0C391564-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e7.4L MPI \/ TBI\u003c\/td\u003e\n          \u003ctd\u003e330\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1995–1998\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F563052 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e8.2L M IE\u003c\/td\u003e\n          \u003ctd\u003e380\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1993–1996\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0D857200-0F819619\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e8.2L MPI \/ M IE\u003c\/td\u003e\n          \u003ctd\u003e380\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F819620 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e502 EFI \/ MPI MCM\u003c\/td\u003e\n          \u003ctd\u003e415\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1993–1997\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F802600-0K999999\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003e502 MAG MPI\u003c\/td\u003e\n          \u003ctd\u003e415\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0L017000 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser\u003c\/td\u003e\n          \u003ctd\u003eScorpion Ski\u003c\/td\u003e\n          \u003ctd\u003e\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1996–1998\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0F800000 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\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\u003eThermostat Temperature\u003c\/dt\u003e\n\u003cdd\u003e160°F (71°C)\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement\u003c\/dd\u003e\n    \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003eHeight: 10.0 in; Width: 11.0 in; Length: 11.0 in\u003c\/dd\u003e\n    \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.07 kg (0.15 lb)\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Thermostat (807252T2\/8072522\/8052732)\u003c\/li\u003e\n    \u003cli\u003e1 x O-ring (25-30224\/25-27018)\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket (27-331792\/27-331791)\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket (27-41812\/27-09556)\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket (27-47510)\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket (27-33918)\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket (27-530451\/27-53045\/27-33179)\u003c\/li\u003e\n    \u003cli\u003e1 x Plastic Housing Sleeve (23-806922)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eEnsure the engine is cool and disconnect the battery.\u003c\/li\u003e\n    \u003cli\u003eDrain the engine coolant\/raw water from the system to a level below the thermostat housing.\u003c\/li\u003e\n    \u003cli\u003eLocate and remove the thermostat housing. Note the orientation of hoses before disconnecting.\u003c\/li\u003e\n    \u003cli\u003eRemove the old thermostat, sleeve, and gaskets. Take note of the thermostat's orientation.\u003c\/li\u003e\n    \u003cli\u003eThoroughly clean the mating surfaces of the housing and engine block, removing any old gasket material or sealant.\u003c\/li\u003e\n    \u003cli\u003eInstall the new plastic sleeve and thermostat in the correct orientation.\u003c\/li\u003e\n    \u003cli\u003ePlace the new gaskets on the housing, applying a marine-grade sealant if recommended by the engine manufacturer.\u003c\/li\u003e\n    \u003cli\u003eReinstall the thermostat housing and tighten the bolts to the manufacturer's specified torque.\u003c\/li\u003e\n    \u003cli\u003eReconnect hoses and refill the cooling system.\u003c\/li\u003e\n    \u003cli\u003eReconnect the battery, start the engine, and check for leaks. Monitor the temperature gauge to ensure it warms up to and holds the correct temperature.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know if this thermostat kit will fit my engine?\u003c\/summary\u003e\n    \u003cp\u003eThe best way to confirm fitment is to check your engine model, year, and serial number against our compatibility table. Cross-referencing your old part number with the numbers in our Part Number Matrix is also a reliable method.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the signs of a faulty thermostat?\u003c\/summary\u003e\n    \u003cp\u003eCommon symptoms include the engine overheating (running above its normal temperature range) or running too cold (not reaching operating temperature). An erratic temperature gauge or visible coolant leaks around the housing can also indicate a problem.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace my engine's thermostat?\u003c\/summary\u003e\n    \u003cp\u003eThermostats should be replaced as part of regular preventative maintenance every 3-5 years, especially in saltwater environments. They should also be replaced immediately if you notice any signs of failure.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy is a 160°F thermostat used in marine engines?\u003c\/summary\u003e\n    \u003cp\u003eA 160°F thermostat is standard for raw-water cooled marine engines because it allows the engine to reach a temperature high enough for efficient combustion but low enough to prevent salt and mineral buildup, which can occur at higher temperatures.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the function of the plastic sleeve?\u003c\/summary\u003e\n    \u003cp\u003eThe plastic sleeve helps to properly position the thermostat within the housing and ensures that water flows correctly through the thermostat assembly for accurate temperature regulation.\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\u003c\/section\u003e\n\u003csection\u003e\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\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n    \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003eManufacturer-Direct Value — 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":50593344323899,"sku":"807252Q5","price":35.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/807252Q5_c9d754b8-00db-44b0-9399-bd9e971d01e7.jpg?v=1758250987"},{"product_id":"160-thermostat-kit-fits-mercruiser-v6-v8-4-3l-8-2l-engines-replaces-807252q5","title":"Thermostat Kit for MerCruiser Engines – Replaces 807252Q5 and 807252T8","description":"\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 *\/\ntable.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\ntable.ss-table th, table.ss-table td {\n  padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n}\n\ntable.ss-table th {\n  white-space:nowrap;\n  word-break:normal;\n  letter-spacing:normal;\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\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis marine thermostat kit is an aftermarket replacement for selected MerCruiser cooling-system applications. It replaces MerCruiser\/Mercury Marine part numbers \u003cstrong\u003e807252Q5\u003c\/strong\u003e and \u003cstrong\u003e807252T8\u003c\/strong\u003e. The kit is identified in the Sierra catalog as thermostat kit \u003cstrong\u003e18-3647\u003c\/strong\u003e.\u003c\/p\u003e\n  \u003cp\u003eUse the original thermostat, gasket arrangement, engine model, and serial number to confirm fitment before ordering. Part-number interchange alone does not confirm compatibility with every MerCruiser engine or cooling-system configuration.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eThermostat kit for selected MerCruiser marine engines.\u003c\/li\u003e\n    \u003cli\u003eSupplied as a multi-piece service kit for thermostat replacement.\u003c\/li\u003e\n    \u003cli\u003eIncludes the thermostat and the listed housing and cover gaskets.\u003c\/li\u003e\n    \u003cli\u003eAftermarket replacement; not an original Mercury Marine component.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eThese are the documented manufacturer and aftermarket references associated with this kit.\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\u003eMerCruiser \/ Mercury Marine\u003c\/td\u003e\n          \u003ctd\u003e807252Q5\u003c\/td\u003e\n          \u003ctd\u003eReplacement reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser \/ Mercury Marine\u003c\/td\u003e\n          \u003ctd\u003e807252T8\u003c\/td\u003e\n          \u003ctd\u003eReplacement reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3647\u003c\/td\u003e\n          \u003ctd\u003eThermostat kit reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eEngine and Fitment Information\u003c\/h2\u003e\n  \u003cp\u003eThe available catalog evidence associates this kit with the MerCruiser\/Mercury Marine replacement references listed above, but it does not establish one universal fitment range for all V6 and V8 engines. Confirm the exact engine model, serial number, cooling-system configuration, and thermostat arrangement against your service manual or the original part before installation.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine and Fitment Information\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003eApplication\u003c\/th\u003e\n          \u003cth\u003eVerification Required\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser \/ Mercury Marine\u003c\/td\u003e\n          \u003ctd\u003eSelected inboard and sterndrive cooling-system applications using 807252Q5 or 807252T8\u003c\/td\u003e\n          \u003ctd\u003eVerify engine model, serial number, cooling system, and original thermostat kit\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n    \u003cdd\u003eThermostat kit\u003c\/dd\u003e\n    \u003cdt\u003eApplication\u003c\/dt\u003e\n    \u003cdd\u003eMarine engine cooling system\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n    \u003cdd\u003eReplacement installation\u003c\/dd\u003e\n    \u003cdt\u003eReplacement References\u003c\/dt\u003e\n    \u003cdd\u003e807252Q5 and 807252T8\u003c\/dd\u003e\n    \u003cdt\u003eAftermarket Status\u003c\/dt\u003e\n    \u003cdd\u003eAftermarket replacement; not OEM\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cp\u003eThe catalog listing for this thermostat kit identifies the following components. Exact gasket form and quantity should be compared with the parts removed from the engine before installation.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Thermostat\u003c\/li\u003e\n    \u003cli\u003e1 x Thermostat housing gasket\u003c\/li\u003e\n    \u003cli\u003e1 x Thermostat cover gasket\u003c\/li\u003e\n    \u003cli\u003e1 x Additional thermostat cover gasket\u003c\/li\u003e\n    \u003cli\u003e1 x Additional thermostat cover gasket\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eCatalog component references include thermostat reference 18-3551; housing gasket reference 18-2917; and cover gasket references 18-2844, 18-2553, and 18-2834. Gasket reference numbers are provided for identification and should not be treated as separate products included beyond the kit contents.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eAllow the engine to cool completely before beginning work, and follow the safety procedures in the engine service manual.\u003c\/li\u003e\n    \u003cli\u003eDisconnect the battery where required and close or isolate the appropriate water supply before removing the thermostat housing.\u003c\/li\u003e\n    \u003cli\u003eRemove the thermostat housing or cover and note the orientation of the old thermostat and gasket arrangement.\u003c\/li\u003e\n    \u003cli\u003eClean the mating surfaces carefully, removing old gasket material without damaging the housing or engine surfaces.\u003c\/li\u003e\n    \u003cli\u003eCompare the replacement thermostat and each supplied gasket with the original parts before assembly.\u003c\/li\u003e\n    \u003cli\u003eInstall the thermostat in the correct orientation and use the appropriate housing and cover gaskets supplied with the kit.\u003c\/li\u003e\n    \u003cli\u003eReassemble the housing using the manufacturer’s specified tightening sequence and torque values.\u003c\/li\u003e\n    \u003cli\u003eRestore the cooling-system connections, start the engine according to the service manual, and check for leaks and proper temperature control.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting and FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\u003csummary\u003eWhat part numbers does this kit replace?\u003c\/summary\u003e\u003cp\u003eThis kit is documented as a replacement for MerCruiser\/Mercury Marine part numbers 807252Q5 and 807252T8.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eIs this a complete thermostat kit?\u003c\/summary\u003e\u003cp\u003eYes. It is sold as a thermostat kit and includes the thermostat together with the listed housing and cover gaskets. Compare the supplied pieces with your original assembly before installation.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eDoes this kit fit every MerCruiser V6 or V8 engine?\u003c\/summary\u003e\u003cp\u003eNo universal V6 or V8 fitment claim should be made from the replacement numbers alone. Verify the exact engine model, serial number, cooling-system configuration, and original thermostat references before ordering.\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 kit that references Mercury Marine part numbers for identification and compatibility checking.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eShould I replace the gaskets when replacing the thermostat?\u003c\/summary\u003e\u003cp\u003eReplacing the associated housing and cover gaskets is recommended when the thermostat housing is opened. Use the gasket that matches the applicable housing and cover surfaces.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eWhat should I do if the supplied gasket does not match?\u003c\/summary\u003e\u003cp\u003eDo not force the part into place or reuse an incorrect gasket. Stop installation and verify the engine model, serial number, cooling-system configuration, and original part numbers.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eSafety and Important Information\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify the engine model, serial number, cooling-system configuration, and original part numbers before purchase.\u003c\/li\u003e\n    \u003cli\u003eCompare the replacement thermostat and gasket shapes with the original parts before installation.\u003c\/li\u003e\n    \u003cli\u003eUse the engine manufacturer’s service information for coolant or water-system procedures, torque specifications, and temperature checks.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended when the correct procedure or fitment is uncertain.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We supply aftermarket components for marine maintenance and repair applications.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFitment-Focused Listings\u003c\/strong\u003e — Product references are provided to help customers compare parts before ordering.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eService Support\u003c\/strong\u003e — Always confirm the exact engine and original part configuration before installation.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723789930811,"sku":"P5-07Z9-KCV7","price":35.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/P5-07Z9-KCV7.png?v=1763031838"}],"url":"https:\/\/seasierra.com\/collections\/mercruiser-415hp-4-stroke-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}