{"title":"MerCruiser 4-Stroke 155HP Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px;border:1px solid #e5e5e5;border-radius:8px;max-width:1100px;\"\u003e\n  \u003cp\u003e\n    This page focuses on MerCruiser 4‑Stroke 155HP marine engines and helps you quickly find compatible parts and service information. Below you’ll find maintenance intervals, frequently used replacement parts, and troubleshooting guidance. You can also browse the main MerCruiser collection for a wider selection. 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.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block;padding:10px 14px;background:#0a6efd;color:#fff;text-decoration:none;border-radius:6px;\"\u003eBrowse All MerCruiser Parts\u003c\/a\u003e\n  \u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"max-width:1100px;padding:16px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 155HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate serial numbers: Engine serial is typically on a tag near the flywheel housing or valve cover; drive unit and transom assembly each have their own serial tags (usually on the starboard side of the upper gearcase and gimbal housing).\u003c\/li\u003e\n    \u003cli\u003eRead the engine description: Many 155HP-class MerCruiser packages are based on inline‑4 3.0L 4‑stroke engines paired with Alpha drive systems; suffixes may indicate carb\/TKS vs. EFI and specific emissions packages.\u003c\/li\u003e\n    \u003cli\u003eConfirm the drive family: Alpha One Gen I vs. Gen II or Bravo drives use different service parts (impellers, seals, anodes). Match your drive serial to ensure correct parts.\u003c\/li\u003e\n    \u003cli\u003eRecord build year and any option codes: Year and calibration options can change ignition, fuel, and cooling components. Use serials first whenever possible.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"max-width:1100px;padding:16px;\"\u003e\n  \u003ch2\u003eEngine Overview\u003c\/h2\u003e\n  \u003ch3\u003eInline‑4 3.0L Platform (typical for ~155 HP packages)\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 #ddd;padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;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 #eee;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInline‑4 3.0L 4‑stroke gasoline, typically carb\/TKS with conventional ignition; seawater\/raw‑water cooled via drive‑mounted impeller or engine‑mounted pump depending on package.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e3.0 \/ 3.0L \/ 3.0 TKS with Alpha One Gen II sterndrive packages in the 135–155 HP range.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSimple, serviceable layout; broad parts availability; good fuel economy at cruise; widely supported.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eMany service items are shared across model years, but impellers, anodes, and seals differ between drive families. Always verify with engine, drive, and transom serial numbers.\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=\"max-width:1100px;padding:16px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for 4‑stroke MerCruiser packages. Always follow your official service manual for your exact serial range.\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 #ddd;padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;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 #eee;\"\u003eEngine oil + filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eUse marine 25W‑40 or spec oil; warm engine before draining; confirm filter thread\/size by serial.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\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 #eee;\"\u003eGear oil (drive\/gearcase)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eDrain from lower plug, fill from bottom; inspect magnet and seals; pressure test if water is present.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\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      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect 50 hours; replace 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck gap and coloration; replace fouled or corroded plugs; torque to spec.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark plug\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eDrain bowl for water; replace cartridge; verify thread and micron rating per system.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\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 #eee;\"\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e2 seasons or 200 hours (inspect annually)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSand\/silt shorten life; replace housing if grooved; Alpha vs. Bravo kits differ.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\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 #eee;\"\u003eAnodes (zinc\/aluminum\/magnesium)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect monthly; replace at ~50% depletion\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eMatch alloy to water type; ensure clean, tight contact; do not paint anodes.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\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 #eee;\"\u003eAccessory\/alternator belt\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect 100 hours; replace 2–3 years\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eLook for glazing or cracks; set proper tension; carry a spare on board.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\"\u003eBelt\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eThermostat\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e2–3 years or if overheat\/low temp issues\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eReplace if stuck or corroded; verify temperature rating for your calibration.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\"\u003eMerCruiser\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:#666;\"\u003e*General guidelines. Service intervals vary by duty cycle, environment, and build specification—always confirm with your service manual.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"max-width:1100px;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\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\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    \u003cli\u003eGaskets \u0026amp; Seals – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-gaskets\"\u003eMerCruiser Gaskets\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"max-width:1100px;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 #ddd;padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;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 #eee;\"\u003eOverheat alarm or high temperature\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect seawater intake screens on the drive, check for collapsed hoses, verify impeller condition, and test thermostat opening temp.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWater pump impeller kit, thermostat, intake screen\/strainer, gaskets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eReplace fuel\/water-separating filter, check anti‑syphon valve, verify ignition timing and plug condition, inspect prop for damage\/slip.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eFuel filter, fuel pump, spark plugs, propeller\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eOn carb\/TKS: confirm choke\/TKS operation and no vacuum leaks; on EFI: check IAC and fuel pressure; inspect plugs and wires.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCarburetor components, spark plugs, fuel filters, idle air and gasket sets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck oil level and color; look for water intrusion; inspect prop shaft seal and drain\/fill plug seals; perform pressure\/vacuum test.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eLower unit seal kit, bearings, drain\/fill seals, anodes (for corrosion mitigation)\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=\"max-width:1100px;padding:16px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between different years or drive platforms?\u003c\/summary\u003e\n    \u003cp\u003eNot always. Items such as impellers, anodes, seals, and ignition\/fuel components can vary by engine serial, drive family (Alpha Gen I vs. Gen II vs. Bravo), and calibration. Use engine, drive, and transom serial numbers to confirm.\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\u003eInspect annually and replace every 1–2 seasons (or ~200 hours). In sandy or silty water, replace more frequently. If you see high temperatures, low flow, or damaged vanes, replace immediately.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change the gear oil?\u003c\/summary\u003e\n    \u003cp\u003eChange at least every 100 hours or annually, and anytime you observe milky oil (water intrusion) or metal on the drain plug magnet. Always refill from the bottom drain to avoid air pockets.\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 serial number, drive serial number, transom assembly serial, model year (if known), and any notes on carb\/TKS vs. EFI. Photos of the nameplates and the part needing replacement are very helpful.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"max-width:1100px;padding:16px;border-top:1px solid #e5e5e5;\"\u003e\n  \u003cp\u003eReady to find parts by horsepower, year, and model? Browse the main MerCruiser collection and use the filters to narrow to your 155HP setup.\u003c\/p\u003e\n  \u003cp\u003e\n    \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block;padding:10px 14px;background:#0a6efd;color:#fff;text-decoration:none;border-radius:6px;\"\u003eShop MerCruiser Parts\u003c\/a\u003e\n  \u003c\/p\u003e\n  \u003cp style=\"font-size:12px;color:#666;\"\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":"carburetor-repair-kit-fits-mercruiser-volvo-penta-155-302-5-0l-replaces-1396-4656","title":"Carburetor Repair Kit – Fits MerCruiser\/Volvo Penta 155-302 5.0L (Replaces 1396-4656)","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 Repair Kit – Fits MerCruiser\/Volvo Penta 155-302 5.0L (Replaces 1396-4656)\u003c\/strong\u003e is designed for MerCruiser and Volvo Penta 5.0L (302 cu in) V8 engines equipped with Holley 2-barrel carburetors. It covers 155, 165, 175, and 185 horsepower models manufactured between 1971 and 1977.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Mercury OEM part number 1396-4656.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngineered for direct replacement and easy installation.\u003c\/li\u003e\n  \u003cli\u003eSpecifically for gasoline-fueled marine engines with Holley 2-barrel carburetors.\u003c\/li\u003e\n  \u003cli\u003eIncludes essential adjustable needles and seats for fine-tuning fuel flow.\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\u003e1396-4656\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 applications, this kit is verified for the 888 (2 BBL) series with the Ford 302 V-8 engine.\u003c\/p\u003e\n\u003cp\u003eFor Volvo Penta applications, this kit is compatible with 5.0L (302) models; confirm your specific year and carburetor type.\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\u003e888 (2 BBL)\u003c\/td\u003e\n        \u003ctd\u003e155–185\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1971–1977\u003c\/td\u003e\n        \u003ctd\u003e1396-4656\u003c\/td\u003e\n        \u003ctd\u003eFord 302 V-8 (5.0L), Serial #3108723 and up\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003e5.0L (302)\u003c\/td\u003e\n        \u003ctd\u003e155–185\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003eCompatible with 155, 165, 175, 185 HP 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\u003eCarburetor Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eGasoline\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e63.8 mm × 70.0 mm × 16.3 mm (H × W × L)\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.16 kg (0.35 lb)\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003eHolley 2-barrel carburetor\u003c\/dd\u003e\n  \u003cdt\u003eOther Attributes\u003c\/dt\u003e\n\u003cdd\u003eContains adjustable needles \u0026amp; seats\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cp\u003eThis kit includes all necessary gaskets, seals, needles, seats, and other small components required for a standard rebuild of a Holley 2-barrel carburetor. Please reference product images to confirm all included parts.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and relieve all fuel system pressure before beginning.\u003c\/li\u003e\n  \u003cli\u003eRemove the air cleaner assembly. Carefully label all vacuum lines and electrical connectors attached to the carburetor before disconnecting them.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the fuel line, throttle linkage, and choke linkage.\u003c\/li\u003e\n  \u003cli\u003eRemove the carburetor mounting nuts or bolts and carefully lift the carburetor off the intake manifold.\u003c\/li\u003e\n  \u003cli\u003eOn a clean workbench, disassemble the carburetor, organizing all parts in the order of removal.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean all metal components with a quality carburetor cleaner. Do not spray cleaner on any rubber or plastic parts.\u003c\/li\u003e\n  \u003cli\u003eCarefully replace the old gaskets, seals, needle, and seat with the new components provided in this kit.\u003c\/li\u003e\n  \u003cli\u003eReassemble the carburetor, ensuring all components are correctly installed and all screws are properly torqued.\u003c\/li\u003e\n  \u003cli\u003ePlace a new base gasket on the intake manifold and reinstall the rebuilt carburetor.\u003c\/li\u003e\n  \u003cli\u003eReconnect all linkages, lines, and connectors. Reinstall the air cleaner.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, start the engine, and meticulously check for any fuel leaks.\u003c\/li\u003e\n  \u003cli\u003eOnce confirmed leak-free, adjust the idle speed and mixture screws according to your engine's service manual for optimal performance.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this kit fit my engine if it's not a MerCruiser 888 model?\u003c\/summary\u003e\n  \u003cp\u003eThis kit is specifically designed for MerCruiser 888 models with the Ford 302 (5.0L) V8 engine and a Holley 2-barrel carburetor from 1971–1977. It may also fit some Volvo Penta 5.0L models, but you must verify your carburetor type and engine specifications before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if my carburetor needs a rebuild?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs include difficulty starting, rough idling, stalling at low speeds, poor acceleration, hesitation, fuel leaks, or black smoke from the exhaust. A visual inspection may also reveal brittle or cracked gaskets.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eAre the needles and seats in this kit adjustable?\u003c\/summary\u003e\n  \u003cp\u003eYes, this kit contains adjustable needles and seats, which allow you to precisely set the fuel level in the float bowl. This is critical for fine-tuning engine performance and ensuring efficient operation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes this kit include instructions?\u003c\/summary\u003e\n  \u003cp\u003eInstructions are not included. This kit is intended for installers with a working knowledge of carburetor rebuilding. For safety and reliability, professional installation is highly recommended if you are not experienced with this type of repair.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the recommended replacement interval for a carburetor kit?\u003c\/summary\u003e\n  \u003cp\u003eThere is no fixed schedule; service life depends on fuel quality, engine hours, and storage conditions. It's best to inspect your carburetor during routine maintenance and plan a rebuild if you notice performance issues or every few years as a preventative measure.\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":50602592764219,"sku":"1396-4656","price":99.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/1396-4656_6cce7cbe-a33c-4c8a-9418-07d63548276e.jpg?v=1758594871"},{"product_id":"sea-water-pump-fits-volvo-penta-mercruiser-omc-4-3l-5-0l-5-7l-v6-v8-replaces-3853850-8m0113734","title":"Bi-Directional Sea Water Circulation Pump for OMC and Volvo Penta GM V6\/V8 Engines – Replaces 3853850, 21124846","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 is a replacement \u003cstrong\u003ebi-directional sea water circulation pump\u003c\/strong\u003e for selected OMC Cobra sterndrive\/outdrive and Volvo Penta stern-drive applications using GM V6 and small-block V8 marine engines. The engine-mounted pump circulates raw water through the marine cooling system and can operate with either standard or reverse engine rotation.\u003c\/p\u003e\n\u003cp\u003eThe company application records identify this as a \u003cstrong\u003esingle pump assembly\u003c\/strong\u003e, not a kit. The records cover OMC engines from 1968–1998 and Volvo Penta GM V6\/V8 small-block applications from 1973 and later. Related catalog references also associate this pump style with selected MerCruiser V6 and V8 small-block applications, including 4.3L, 5.0L, and 5.7L engines using the applicable pump configuration.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBi-directional design for standard- and reverse-rotation installations.\u003c\/li\u003e\n  \u003cli\u003eEngine-mounted circulation pump for raw-water cooling systems.\u003c\/li\u003e\n  \u003cli\u003eSuitable for GM V6 and small-block V8 marine applications within the stated fitment ranges.\u003c\/li\u003e\n  \u003cli\u003eSold as one pump assembly. No separate gasket set or installation hardware is listed in the company package record.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the references below to compare the pump with the number on your existing component and your engine service information. Part-number references do not replace confirmation of the complete engine application.\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 source\u003c\/th\u003e\n\u003cth\u003eReference number\u003c\/th\u003e\n\u003cth\u003eReference type\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e3853850\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e985429\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e980477\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e382218\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e383953\u003c\/td\u003e\n\u003ctd\u003eOEM reference listed by the company\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e21124846\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e3853850\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e856364\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e835390\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3599-2\u003c\/td\u003e\n\u003ctd\u003eCatalog cross-reference for 3853850\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\u003eKeep the engine brand, model, year, horsepower, rotation, and timing-cover configuration together when confirming fitment. Always compare the mounting pattern, hose connections, and the number on the original pump before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Confirmed Company Applications\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eEngine application\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003ePower or configuration\u003c\/th\u003e\n\u003cth\u003eReference numbers\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC Cobra stern drive\/outdrive\u003c\/td\u003e\n\u003ctd\u003e4-cylinder GM marine engines\u003c\/td\u003e\n\u003ctd\u003e1968–1998\u003c\/td\u003e\n\u003ctd\u003e100–140 HP\u003c\/td\u003e\n\u003ctd\u003e3853850, 985429, 980477, 382218, 383953\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC Cobra stern drive\/outdrive\u003c\/td\u003e\n\u003ctd\u003e6-cylinder GM marine engines\u003c\/td\u003e\n\u003ctd\u003e1968–1998\u003c\/td\u003e\n\u003ctd\u003e165 HP\u003c\/td\u003e\n\u003ctd\u003e3853850, 985429, 980477, 382218, 383953\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC Cobra stern drive\/outdrive\u003c\/td\u003e\n\u003ctd\u003eGM V6 marine engines\u003c\/td\u003e\n\u003ctd\u003e1968–1998\u003c\/td\u003e\n\u003ctd\u003e150–165 HP\u003c\/td\u003e\n\u003ctd\u003e3853850, 985429, 980477, 382218, 383953\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC Cobra stern drive\/outdrive\u003c\/td\u003e\n\u003ctd\u003eGM small-block V8 marine engines\u003c\/td\u003e\n\u003ctd\u003e1968–1998\u003c\/td\u003e\n\u003ctd\u003e170–350 HP\u003c\/td\u003e\n\u003ctd\u003e3853850, 985429, 980477, 382218, 383953\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta stern drive\/outdrive\u003c\/td\u003e\n\u003ctd\u003eGM V6 and small-block V8 marine engines\u003c\/td\u003e\n\u003ctd\u003e1973 and later\u003c\/td\u003e\n\u003ctd\u003eStamped or composite timing-chain cover configuration\u003c\/td\u003e\n\u003ctd\u003e21124846, 3853850, 856364, 835390\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eRelated catalog application guidance\u003c\/h3\u003e\n\u003cp\u003eCatalog information associates the 3853850 pump reference with GM V6 and small-block V8 marine engines, including 4.3L, 5.0L, and 5.7L configurations. Selected Volvo Penta applications include 4.3GXIE-M, GL, GXI, and related V6 model families. Selected MerCruiser applications use the corresponding small-block pump configuration and may differ by engine year, timing-cover design, and rotation. Verify the exact model and serial-number range before installation.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct type\u003c\/dt\u003e\n  \u003cdd\u003eBi-directional sea water circulation pump\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eEngine-mounted\u003c\/dd\u003e\n  \u003cdt\u003eIntended system\u003c\/dt\u003e\n  \u003cdd\u003eRaw-water or sea-water marine cooling system\u003c\/dd\u003e\n  \u003cdt\u003eEngine family\u003c\/dt\u003e\n  \u003cdd\u003eGM V6 and small-block V8 marine engines, plus the OMC 4-cylinder and 6-cylinder applications listed above\u003c\/dd\u003e\n  \u003cdt\u003eRotation\u003c\/dt\u003e\n  \u003cdd\u003eBi-directional; confirm the complete engine and pump configuration before installation\u003c\/dd\u003e\n  \u003cdt\u003eTiming-cover compatibility\u003c\/dt\u003e\n  \u003cdd\u003eCompany Volvo Penta record specifies stamped or composite timing-chain covers\u003c\/dd\u003e\n  \u003cdt\u003ePackage type\u003c\/dt\u003e\n  \u003cdd\u003eSingle pump assembly\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Bi-directional sea water circulation pump assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA separate gasket set, hoses, clamps, mounting bolts, and other installation hardware are not listed as included in the company package record. Check the old gasket and mounting hardware and replace them as required for your engine.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eTurn the engine off, allow it to cool completely, and disconnect the battery.\u003c\/li\u003e\n  \u003cli\u003eClose the seacock or otherwise isolate the raw-water supply before removing hoses.\u003c\/li\u003e\n  \u003cli\u003ePlace a suitable container below the pump and disconnect the inlet and outlet hoses.\u003c\/li\u003e\n  \u003cli\u003eRemove the mounting fasteners and take off the old pump.\u003c\/li\u003e\n  \u003cli\u003eClean the engine mounting surface and remove old gasket material without damaging the sealing surface.\u003c\/li\u003e\n  \u003cli\u003eConfirm that the replacement pump, mounting pattern, hose connections, and rotation match the original application.\u003c\/li\u003e\n  \u003cli\u003eInstall the correct gasket or sealing material specified for the engine. The gasket is not listed as a separate included item for this product.\u003c\/li\u003e\n  \u003cli\u003eMount the pump and tighten the fasteners to the engine manufacturer’s specified torque.\u003c\/li\u003e\n  \u003cli\u003eReconnect the hoses and secure all clamps. Open the seacock and reconnect the battery.\u003c\/li\u003e\n  \u003cli\u003eStart the engine, inspect all connections for leaks, and monitor engine temperature during the initial run.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting and FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm fitment?\u003c\/summary\u003e\n  \u003cp\u003eCompare the complete engine brand, model, year, horsepower, rotation, timing-cover design, mounting pattern, hose connections, and the number on the original pump. The pump is intended for the OMC and Volvo Penta applications listed on this page; related MerCruiser applications must be confirmed against the specific engine configuration.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this pump bi-directional?\u003c\/summary\u003e\n  \u003cp\u003eYes. The company and catalog references identify this pump type as bi-directional. Confirm the complete pump and engine configuration before installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes the product include a gasket?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is for one pump assembly. A separate gasket set is not listed in the company package record. Use the gasket or sealing material specified for your engine application.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are common signs of a failing sea water pump?\u003c\/summary\u003e\n  \u003cp\u003eSymptoms may include overheating, reduced raw-water flow, water leakage near the pump, unusual bearing or seal noise, or visible corrosion. Stop operation and inspect the cooling system if any of these symptoms occur.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this fit every 4.3L, 5.0L, or 5.7L marine engine?\u003c\/summary\u003e\n  \u003cp\u003eNo. Displacement alone does not confirm fitment. Engine year, model family, timing-cover design, rotation, mounting arrangement, and serial-number range must also match.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat maintenance is recommended?\u003c\/summary\u003e\n  \u003cp\u003eInspect the pump periodically for leaks, corrosion, loose fasteners, damaged hoses, and abnormal noise. Follow the engine manufacturer’s service schedule for cooling-system inspection and replacement of wear items.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety and Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the part number and physical configuration against the original pump and the engine service manual.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on engine displacement alone to determine compatibility.\u003c\/li\u003e\n  \u003cli\u003eClose the seacock and disconnect the battery before removing the pump.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when the engine model, rotation, or cooling-system configuration is uncertain.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component, not an original branded OEM pump.\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 — Components selected for common sterndrive, inboard, and raw-water cooling applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-focused fitment\u003c\/strong\u003e — Use the listed model, year, horsepower, rotation, and reference-number conditions when ordering.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePractical replacement support\u003c\/strong\u003e — Confirm the original component and service-manual requirements before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718269767995,"sku":"WQ-GFAI-HRIZ","price":160.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/WQ-GFAI-HRIZ.png?v=1762958681"},{"product_id":"circulating-water-pump-fits-mercruiser-volvo-penta-4-3-6-3l-marine-engines-replaces-8m0113734-3853850","title":"Bi-Directional Circulating Water Pump for GM V6 and Small-Block V8 Marine Engines – Replaces 8M0113734, 8503991 and 3853850","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 bi-directional circulating water pump is an aftermarket replacement for selected GM V6 and small-block V8 marine engine cooling systems. It is designed for applications using either a metal or composite timing-chain cover and is intended to replace the corresponding original pump after confirming the engine configuration, mounting pattern and original part number.\u003c\/p\u003e\n\u003cp\u003eCatalog references identify this pump style with Mercury Marine 8503991 and 8M0113734, Volvo Penta 3853850, OMC 382218, 980477 and 985429, Crusader 20318 and 7142520, Pleasurecraft RA057018, and Sierra 18-3599-1 or 18-3599-2. These references are provided for identification and interchange research; verify your exact engine before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngine-mounted circulating water pump for applicable GM V6 and small-block V8 marine engines.\u003c\/li\u003e\n  \u003cli\u003eBi-directional design for compatible metal and composite timing-chain-cover configurations.\u003c\/li\u003e\n  \u003cli\u003eMounting gasket included for the listed pump application.\u003c\/li\u003e\n  \u003cli\u003eAftermarket replacement; not an OEM-manufactured component.\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 pump with the part removed from your engine.\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 source\u003c\/th\u003e\n\u003cth\u003eReference number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Marine\u003c\/td\u003e\n\u003ctd\u003e8503991\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Marine\u003c\/td\u003e\n\u003ctd\u003e8M0113734\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e3853850\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e382218\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e980477\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e985429\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrusader\u003c\/td\u003e\n\u003ctd\u003e20318\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrusader\u003c\/td\u003e\n\u003ctd\u003e7142520\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePleasurecraft\u003c\/td\u003e\n\u003ctd\u003eRA057018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3599-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3599-2\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\u003eCatalog information identifies the applicable engine family as GM V6 and small-block V8 marine engines, including 3.8L, 4.3L, 5.0L and 5.7L configurations associated with the 3853850 pump reference. The same pump style is listed for both metal and composite timing-chain covers.\u003c\/p\u003e\n\u003cp\u003eFitment depends on the exact engine design, cover configuration, mounting arrangement and serial or production range. A displacement or brand match alone does not confirm compatibility. Compare the original pump, pulley and mounting surface before ordering.\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\u003eEngine family\u003c\/th\u003e\n\u003cth\u003eDisplacement examples\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eApplication note\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGM V6 marine engines\u003c\/td\u003e\n\u003ctd\u003e3.8L, 4.3L\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eApplicable only where the original pump and mounting configuration match.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGM small-block V8 marine engines\u003c\/td\u003e\n\u003ctd\u003e5.0L, 5.7L\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eVerify timing-chain-cover style and original pump reference.\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\u003eBi-directional circulating water pump\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eSelected GM V6 and small-block V8 marine engines\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eEngine mounted\u003c\/dd\u003e\n  \u003cdt\u003eTiming-chain-cover compatibility\u003c\/dt\u003e\n\u003cdd\u003eDesigned for compatible metal and composite cover configurations\u003c\/dd\u003e\n  \u003cdt\u003eReplacement references\u003c\/dt\u003e\n\u003cdd\u003e8503991, 8M0113734, 3853850, 382218, 980477 and 985429\u003c\/dd\u003e\n  \u003cdt\u003eProduct status\u003c\/dt\u003e\n\u003cdd\u003eAftermarket replacement part\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 Bi-directional circulating water pump\u003c\/li\u003e\n  \u003cli\u003e1 x Mounting gasket\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.\u003c\/li\u003e\n  \u003cli\u003eDrain the cooling system into a suitable container.\u003c\/li\u003e\n  \u003cli\u003eRemove the belt and any components that obstruct access to the pump.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the cooling hoses and remove the original pump mounting hardware.\u003c\/li\u003e\n  \u003cli\u003eClean the engine mounting surface thoroughly and remove all old gasket material.\u003c\/li\u003e\n  \u003cli\u003eCompare the replacement pump with the original part, including mounting holes, pulley alignment, ports and cover interface.\u003c\/li\u003e\n  \u003cli\u003eInstall the supplied gasket and replacement pump. Tighten fasteners in the manufacturer's specified sequence and to the specified torque.\u003c\/li\u003e\n  \u003cli\u003eReconnect hoses, reinstall the belt and replace any removed brackets or components.\u003c\/li\u003e\n  \u003cli\u003eRefill the cooling system with the correct coolant, reconnect the battery and check for leaks and proper circulation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting and FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat engines is this pump intended for?\u003c\/summary\u003e\n  \u003cp\u003eCatalog references identify this pump style for selected GM V6 and small-block V8 marine engines, including 3.8L, 4.3L, 5.0L and 5.7L applications. Confirm the original pump reference and physical configuration before purchase.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs the pump bi-directional?\u003c\/summary\u003e\n  \u003cp\u003eYes. The pump is described as bi-directional and is intended for compatible engines using either a metal or composite timing-chain cover.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs a gasket included?\u003c\/summary\u003e\n  \u003cp\u003eYes. One mounting gasket is included with the pump.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes a listed engine displacement guarantee fitment?\u003c\/summary\u003e\n  \u003cp\u003eNo. Engine displacement is only an initial guide. Verify the exact engine model, production or serial range when applicable, timing-chain-cover style, mounting pattern and original part number.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n  \u003cp\u003eNo. This listing is for an aftermarket replacement pump. The OEM and aftermarket numbers shown above are reference numbers used to help identify the applicable pump.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are common signs of a failing circulating water pump?\u003c\/summary\u003e\n  \u003cp\u003ePossible symptoms include overheating, coolant leakage near the pump, abnormal bearing or pulley noise, pulley wobble, or visible damage around the pump and gasket joint. Diagnose the complete cooling system before replacing components.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety and Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirm the original part number and compare the pump's mounting and port arrangement before ordering.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on the brand, displacement or year alone to determine fitment.\u003c\/li\u003e\n  \u003cli\u003eDo not operate the engine without the correct coolant level and a properly installed belt.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended, especially where engine access or coolant service is difficult.\u003c\/li\u003e\n  \u003cli\u003eOEM and brand names are used only to identify compatibility and replacement references.\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 for common marine engine and cooling-system service applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClear reference information\u003c\/strong\u003e — OEM and aftermarket numbers are displayed to help customers compare the replacement with the original part.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment-first ordering\u003c\/strong\u003e — Always confirm the engine configuration and original component before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718269800763,"sku":"ew2E1FP003w","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/ew2E1FP003w.png?v=1762958683"},{"product_id":"bi-directional-water-pump-fits-mercruiser-volvo-penta-140-260hp-replaces-8503991-8m0113734-3853850","title":"Bi-Directional Circulating Water Pump for GM V6 \u0026 Small-Block V8 Marine Engines – Replaces 8503991, 8M0113734, 3853850","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 {\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 engine-mounted \u003cstrong\u003ebi-directional circulating water pump\u003c\/strong\u003e is an aftermarket replacement for selected GM-based marine cooling systems. Catalog references identify this pump family for GM V6 and small-block V8 engines, including 4.3L, 5.0L, and 5.7L applications, and for compatible Volvo Penta marine applications using the same water-pump pattern.\u003c\/p\u003e\n\u003cp\u003eThe pump is designed to circulate engine coolant through the block and cooling system. Its bi-directional design supports compatible standard- and reverse-rotation applications and works with both metal and composite timing-chain covers when the engine configuration matches.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngine-mounted circulating water pump for selected marine GM V6 and small-block V8 applications.\u003c\/li\u003e\n  \u003cli\u003eBi-directional design for compatible rotation configurations.\u003c\/li\u003e\n  \u003cli\u003eSuitable for applications using metal or composite timing-chain covers where specified.\u003c\/li\u003e\n  \u003cli\u003eReplacement gasket is included for the listed pump application.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the following references as interchange leads only. Always compare the original pump, mounting arrangement, gasket pattern, timing-chain cover, and engine serial information before ordering.\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 or Source\u003c\/th\u003e\n\u003cth\u003eReference Number\u003c\/th\u003e\n\u003cth\u003eRelationship\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\u003e8503991\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMerCruiser \/ Mercury Marine\u003c\/td\u003e\n\u003ctd\u003e8M0113734\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e3853850\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3599-1\u003c\/td\u003e\n\u003ctd\u003eAftermarket interchange reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3599-2\u003c\/td\u003e\n\u003ctd\u003eAftermarket interchange reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCrusader\u003c\/td\u003e\n\u003ctd\u003e20318\u003c\/td\u003e\n\u003ctd\u003eAftermarket interchange reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCrusader\u003c\/td\u003e\n\u003ctd\u003e7142520\u003c\/td\u003e\n\u003ctd\u003eAftermarket interchange reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePleasurecraft\u003c\/td\u003e\n\u003ctd\u003eRA057018\u003c\/td\u003e\n\u003ctd\u003eAftermarket interchange 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\u003eThe references below describe the documented engine families and applications associated with this pump style. Exact fitment can vary by engine year, serial range, rotation, timing-chain cover, and bypass-hole configuration.\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\u003eEngine Family\u003c\/th\u003e\n        \u003cth\u003eDisplacement Examples\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eApplication Notes\u003c\/th\u003e\n        \u003cth\u003eReference\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGM V6\u003c\/td\u003e\n        \u003ctd\u003e3.8L, 4.3L\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eSmall-block marine applications; verify pump pattern and timing-chain cover.\u003c\/td\u003e\n        \u003ctd\u003e3853850\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGM small-block V8\u003c\/td\u003e\n        \u003ctd\u003e5.0L, 5.7L\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eCompatible applications may use metal or composite timing-chain covers.\u003c\/td\u003e\n        \u003ctd\u003e3853850\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta GM-based engines\u003c\/td\u003e\n        \u003ctd\u003e4.3L, 5.0L, 5.7L and related applications\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model, serial range, rotation, and mounting configuration.\u003c\/td\u003e\n        \u003ctd\u003e3853850\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCrusader \/ Pleasurecraft applications\u003c\/td\u003e\n        \u003ctd\u003eSelected GM V6 and small-block V8 engines\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eUse the listed reference number and compare the original component before purchase.\u003c\/td\u003e\n        \u003ctd\u003e20318, 7142520, RA057018\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 Do not rely on horsepower or model year alone to confirm fitment. Some later 4.3L V6 configurations may use a different cooling-pump arrangement or may lack the required water-bypass opening. Verify the engine casting, pump flange, gasket pattern, rotation, and timing-chain cover before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eBi-directional engine-mounted circulating water pump\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eSelected GM V6 and small-block V8 marine cooling systems\u003c\/dd\u003e\n  \u003cdt\u003eCompatible Reference\u003c\/dt\u003e\n  \u003cdd\u003eMerCruiser 8503991 and 8M0113734; Volvo Penta 3853850\u003c\/dd\u003e\n  \u003cdt\u003eFlow Direction\u003c\/dt\u003e\n  \u003cdd\u003eBi-directional\u003c\/dd\u003e\n  \u003cdt\u003eTiming-Chain Cover Compatibility\u003c\/dt\u003e\n  \u003cdd\u003eMetal and composite covers where specified by the engine application\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eEngine mounted\u003c\/dd\u003e\n  \u003cdt\u003eGasket\u003c\/dt\u003e\n  \u003cdd\u003eIncluded for the documented pump application\u003c\/dd\u003e\n  \u003cdt\u003eConstruction Details\u003c\/dt\u003e\n  \u003cdd\u003eCatalog descriptions for this pump style identify a stainless-steel backing plate, machined brass impeller, painted pump housing, and stainless-steel sealing components. Confirm the supplied component before installation.\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 Bi-directional circulating water pump\u003c\/li\u003e\n  \u003cli\u003e1 x Application-specific mounting gasket\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.\u003c\/li\u003e\n  \u003cli\u003eDrain the engine coolant into a suitable container.\u003c\/li\u003e\n  \u003cli\u003eLoosen the drive belt and disconnect the hoses attached to the pump.\u003c\/li\u003e\n  \u003cli\u003eRemove the pump mounting bolts and carefully remove the old pump.\u003c\/li\u003e\n  \u003cli\u003eClean the engine mounting surface and remove all old gasket material and sealant.\u003c\/li\u003e\n  \u003cli\u003eCompare the replacement pump, gasket, ports, and bypass openings with the original component.\u003c\/li\u003e\n  \u003cli\u003eInstall the supplied gasket and replacement pump. Tighten the mounting bolts to the engine manufacturer’s specifications.\u003c\/li\u003e\n  \u003cli\u003eReconnect the hoses and reinstall the drive belt with the correct tension.\u003c\/li\u003e\n  \u003cli\u003eRefill the cooling system with the manufacturer-recommended coolant mixture.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, start the engine, and check carefully for leaks, abnormal noise, and proper operating temperature.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this pump bi-directional?\u003c\/summary\u003e\n  \u003cp\u003eYes. It is intended for compatible marine engines requiring a bi-directional circulating water pump. Confirm the engine’s rotation and pump configuration before installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhich engines does this pump fit?\u003c\/summary\u003e\n  \u003cp\u003eDocumented applications include selected GM V6 and small-block V8 marine engines, including common 4.3L, 5.0L, and 5.7L configurations, plus compatible Volvo Penta, Crusader, and Pleasurecraft applications. Exact fitment depends on the engine configuration and reference number.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this fit every 4.3L V6 engine?\u003c\/summary\u003e\n  \u003cp\u003eNo. A 4.3L designation alone does not confirm fitment. Check the engine serial range, rotation, mounting pattern, bypass opening, gasket pattern, and timing-chain cover before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes the package include a gasket?\u003c\/summary\u003e\n  \u003cp\u003eYes. The listed pump application includes an application-specific mounting gasket. Confirm that the gasket matches the engine before installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow can I tell if the water pump is failing?\u003c\/summary\u003e\n  \u003cp\u003eCommon symptoms include overheating, coolant leakage near the pump or weep area, poor coolant circulation, bearing noise, or visible damage to the pulley, housing, impeller, or seal.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM pump?\u003c\/summary\u003e\n  \u003cp\u003eNo. This listing is for an aftermarket replacement. The OEM and aftermarket numbers shown above are reference numbers used to help verify application and interchange.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat should I check before ordering?\u003c\/summary\u003e\n  \u003cp\u003eCompare the original pump’s mounting flange, hose and port locations, rotation, gasket shape, bypass opening, timing-chain cover, and all available engine identification information.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eAllow the engine to cool fully before opening the cooling system or removing the pump.\u003c\/li\u003e\n  \u003cli\u003eUse the correct coolant and follow the engine manufacturer’s bleeding and refill procedure.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on horsepower, year, or displacement alone to confirm fitment.\u003c\/li\u003e\n  \u003cli\u003eVerify the original part and engine configuration before purchase.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended where required by the engine manufacturer or applicable safety procedures.\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 common marine engine and cooling-system applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Information\u003c\/strong\u003e — Reference numbers and compatibility details are provided to help you compare the replacement with your original part.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGlobal Fulfillment\u003c\/strong\u003e — Standard and expedited shipping options are shown at checkout where available.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718269833531,"sku":"J2-MI3C-32P4","price":160.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/J2-MI3C-32P4.png?v=1762958685"}],"url":"https:\/\/seasierra.com\/collections\/mercruiser-4-stroke-155hp-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}