{"title":"MerCruiser 4-Stroke 190-377HP Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"max-width:980px;margin:0 auto;padding:12px 16px\"\u003e\n  \u003cp\u003eFor MerCruiser 4‑Stroke 190–377HP marine engines (V6 and V8 sterndrive platforms), this page helps you find compatible parts and key service information. Below you’ll find maintenance tips, commonly replaced components, and troubleshooting guidance. You can also browse our main MerCruiser collection. Scroll to the bottom of the page to start browsing parts for this engine range, and on the collection page use the “Filter \u0026amp; Sort” controls to narrow results by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block;padding:10px 14px;background:#00467f;color:#fff;text-decoration:none;border-radius:6px\"\u003eBrowse All MerCruiser Parts\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"max-width:980px;margin:0 auto;padding:12px 16px\"\u003e\n  \u003ch2\u003eHow to Identify Your 190–377HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the serial\/ID plate on the engine (often on the flame arrestor cover or engine block) and on the sterndrive\/transom assembly. Record both the engine and drive serial numbers.\u003c\/li\u003e\n    \u003cli\u003eModel details typically include displacement (e.g., 4.3L, 5.0\/5.7, 6.2L, 8.2L), induction type (carb\/TKS vs. MPI), and emissions package (e.g., ECT\/catalyst). These affect parts selection.\u003c\/li\u003e\n    \u003cli\u003eIdentify your drive: Alpha One drives use an in‑drive raw‑water pump; Bravo drives use an engine‑mounted seawater pump. Impeller, water pump, and gearcase parts differ by drive type.\u003c\/li\u003e\n    \u003cli\u003eThese are 4‑stroke gasoline engines (no fuel\/oil premix). Follow the MerCruiser service manual for oil grades, capacities, and torque specs.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"max-width:980px;margin:0 auto;padding:12px 16px\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n\n  \u003ch3\u003eV6 Platform (approx. 190–225 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 #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\"\u003e4‑stroke 4.3L V6, carb\/TKS or MPI fuel injection; raw‑water or closed‑cooling; paired with Alpha or Bravo drives.\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\"\u003e4.3‑liter V6 variants in the 190–225 HP range (carb\/TKS and MPI).\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\"\u003eCompact package, good fuel economy, strong low‑to‑mid RPM torque for runabouts and small cruisers.\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\"\u003eImpeller location depends on drive (in‑drive for Alpha, engine‑mounted for Bravo). Many accessories (belts, alternators, mounts) vary by year and emissions package—match by serial.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eV8 Platform (approx. 260–377 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 #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\"\u003e4‑stroke V8 families (5.0\/5.7, 6.2L, 8.2L), carb\/MPI\/ECT catalyst variants; commonly paired with Bravo One\/Two\/Three drives.\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\"\u003e5.0\/5.7‑liter V8, 350 MAG‑class, 6.2L, and 8.2L MAG variants in the 260–377 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\"\u003eHigher top‑end power and strong mid‑range, ideal for heavier boats and watersports.\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\"\u003eBravo platforms use an engine‑mounted seawater pump impeller. Exhaust manifolds\/risers, thermostat housings, and sensor sets vary by generation—verify via serial and emissions package.\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:980px;margin:0 auto;padding:12px 16px\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines; always follow your official MerCruiser service manual and local operating conditions.\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\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eWarm engine, drain completely, replace filter, refill with spec’d marine oil; check for leaks.\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 lube (drive)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eInspect for water intrusion\/metal; change sooner if contaminated or after impact.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\"\u003eMerCruiser Collection\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003e100–300 hrs (inspect annually)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eReplace if fouled or out of spec; gap and heat range per serial‑specific manual.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\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 #eee\"\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eEvery 50–100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eDrain\/replace more often with ethanol fuel or debris; check for water in bowl.\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\"\u003eRaw‑water pump impeller\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eEvery 2 seasons (or ~200 hrs)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eAlpha: in‑drive pump; Bravo: engine‑mounted seawater pump. Replace sooner in sandy\/silty use.\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 (engine\/drive)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eInspect 30–50 hrs; replace when 50% depleted\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eUse the correct alloy for your water (fresh\/brackish\/salt). 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\"\u003eSerpentine \/ V‑belt\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eInspect 50 hrs; replace as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eReplace if cracked, glazed, or noisy; verify tensioner operation.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\"\u003eBelts\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\"\u003eEvery 2–3 seasons (inspect annually)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eReplace if running cold\/hot or with corrosion. Housings vary by generation.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\"\u003eMerCruiser Collection\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eDrive\/exhaust\/shift bellows\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eInspect annually; 3–5 years typical\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eReplace at first sign of cracking to prevent water intrusion.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bellow\"\u003eBellows\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"max-width:980px;margin:0 auto;padding:12px 16px\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service: \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\u003eExhaust \u0026amp; Manifolds: \u003ca href=\"https:\/\/seasierra.com\/collections\/manifolds\"\u003eManifolds\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropellers \u0026amp; Hubs: \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-propellers\"\u003eMerCruiser Propellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eSensors \u0026amp; Switches: \u003ca href=\"https:\/\/seasierra.com\/collections\/sensors\"\u003eSensors\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"max-width:980px;margin:0 auto;padding:12px 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\"\u003eOverheating or high‑temp alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eInspect drive water inlets for blockage; verify seawater pump impeller and belt tension; test thermostat; check hoses for collapse.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eWater pump impeller\/kit, thermostat, raw‑water hoses, intake screens, anodes.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003ePoor acceleration or low WOT RPM\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eCheck propeller damage\/pitch, bottom growth, fuel filter restriction, and spark plug condition.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003ePropeller, fuel filter\/water separator, spark plugs, fuel pump.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eVerify fresh fuel, inspect anti‑siphon valve and lines, look for vacuum leaks, and confirm sensor\/IAC operation.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eFuel filters, fuel pump, gaskets, sensors, spark plugs.\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 lube\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eCheck lube level\/condition; inspect prop shaft for fishing line; verify seals and U‑joints; adjust shift cable if needed.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eLower unit seal kit, bearings, propeller hub, gear lube.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eTrim\/tilt inoperative or intermittent\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eConfirm battery voltage and fuses, test trim relays, check pump fluid level, and inspect switch wiring.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee\"\u003eTrim motor\/pump, electrical relays, wiring, hydraulic hoses.\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:980px;margin:0 auto;padding:12px 16px\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between different years, V6\/V8 engines, or Alpha\/Bravo drives?\u003c\/summary\u003e\n    \u003cp\u003eSome maintenance items are shared, but many components (cooling, exhaust, sensors, brackets, and drive parts) vary by engine family, emissions package, and drive type. Always confirm with your engine and drive serial numbers 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 preventative interval, replace every 2 seasons or ~200 hours—sooner if you operate in sandy\/silty water or see temperature fluctuations. Inspect annually for set‑vanes, cracks, or missing blades.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change drive gear lube?\u003c\/summary\u003e\n    \u003cp\u003eChange every 100 hours or annually. Service immediately if water contamination is found, after prop strikes, or if shifting\/gear noise occurs.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003ePlease provide the engine serial number, drive serial number, displacement (e.g., 4.3L\/6.2L), induction type (carb\/TKS or MPI), emissions package (ECT\/catalyst if applicable), and the boat’s model year.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"max-width:980px;margin:0 auto;padding:12px 16px\"\u003e\n  \u003cp\u003eReady to find the exact components for your MerCruiser 4‑Stroke 190–377HP engine? Browse the main MerCruiser collection and use Filter \u0026amp; Sort to narrow by horsepower, year, and model.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block;padding:10px 14px;background:#00467f;color:#fff;text-decoration:none;border-radius:6px\"\u003eShop MerCruiser Parts\u003c\/a\u003e\u003c\/p\u003e\n  \u003cp style=\"font-size:0.95em;color:#333\"\u003eIf you’re unsure about your model, send us a clear photo of the engine and drive nameplates plus the part you need—we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"serpentine-belt-fits-mercruiser-4-3l-6-2l-replaces-57-865615q04-57-8638764-57-862086a1-57-8620861","title":"Serpentine Belt for MerCruiser 4.3L V6 and 5.0L–6.2L V8 Engines","description":"\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis aftermarket \u003cstrong\u003eserpentine belt\u003c\/strong\u003e is designed for selected MerCruiser stern-drive and out-drive applications, including 4.3L V6 engines rated at 155–205 HP and 5.0L–6.2L V8 engines rated at 180–300 HP. It is listed for 1998–2009 MerCruiser applications using Alpha Gen II or Bravo drives, as well as compatible GM and MIE marine engines.\u003c\/p\u003e\n  \u003cp\u003eUse the engine model, drive type, year, serial number, belt routing, and original belt dimensions to confirm fitment before ordering. Application details can vary between engines with similar displacement.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eSingle serpentine belt for marine engine accessory drive systems.\u003c\/li\u003e\n    \u003cli\u003eDesigned for selected MerCruiser Alpha Gen II and Bravo drive applications.\u003c\/li\u003e\n    \u003cli\u003eAftermarket replacement for the listed Mercury\/MerCruiser and Sierra reference numbers.\u003c\/li\u003e\n    \u003cli\u003eNominal belt width: 13\/16 inch; nominal length: 105 inches.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eThe following numbers are reference and interchange identifiers associated with this belt. They are not the seller's internal product identifier.\u003c\/p\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:400px; }\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  \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 \/ MerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-8638764\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ MerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-865615Q04\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ MerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-862086\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ MerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-8620861\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ MerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-862086A1\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ MerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-865615004\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ MerCruiser\u003c\/td\u003e\n\u003ctd\u003e865615004\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMercury \/ MerCruiser\u003c\/td\u003e\n\u003ctd\u003e8638764\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-15101\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 Application Compatibility\u003c\/h2\u003e\n  \u003cp\u003eThe company application listing covers the following engine and drive ranges for 1998–2009. Confirm the complete engine and serial-number combination before purchase; displacement alone does not establish fitment.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Engine and Application Compatibility\"\u003e\n      \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eEngine family\u003c\/th\u003e\n\u003cth\u003eDisplacement\u003c\/th\u003e\n\u003cth\u003eConfiguration\u003c\/th\u003e\n\u003cth\u003eRated horsepower\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eDrive or application\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L\u003c\/td\u003e\n\u003ctd\u003eV6\u003c\/td\u003e\n\u003ctd\u003e155–205 HP\u003c\/td\u003e\n\u003ctd\u003e1998–2009\u003c\/td\u003e\n\u003ctd\u003eAlpha Gen II or Bravo drive\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0L–6.2L\u003c\/td\u003e\n\u003ctd\u003eV8\u003c\/td\u003e\n\u003ctd\u003e180–300 HP\u003c\/td\u003e\n\u003ctd\u003e1998–2009\u003c\/td\u003e\n\u003ctd\u003eAlpha Gen II or Bravo drive\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eGM and MIE marine engines\u003c\/td\u003e\n\u003ctd\u003e4.3L V6 and 5.0L–6.2L V8 applications\u003c\/td\u003e\n\u003ctd\u003eAs applicable\u003c\/td\u003e\n\u003ctd\u003eWithin the listed application range\u003c\/td\u003e\n\u003ctd\u003e1998–2009\u003c\/td\u003e\n\u003ctd\u003eVerify belt routing and original reference number\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 The exact belt routing and accessory arrangement may depend on the drive, power-steering equipment, alternator position, cooling configuration, and serial-number range. Compare the removed belt and consult the engine service information when necessary.\u003c\/p\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\u003eSerpentine belt\u003c\/dd\u003e\n    \u003cdt\u003eQuantity\u003c\/dt\u003e\n\u003cdd\u003e1 belt\u003c\/dd\u003e\n    \u003cdt\u003eNominal width\u003c\/dt\u003e\n\u003cdd\u003e13\/16 inch\u003c\/dd\u003e\n    \u003cdt\u003eNominal length\u003c\/dt\u003e\n\u003cdd\u003e105 inches\u003c\/dd\u003e\n    \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eSelected MerCruiser stern-drive and out-drive systems, including Alpha Gen II and Bravo drive applications\u003c\/dd\u003e\n    \u003cdt\u003eEngine range\u003c\/dt\u003e\n\u003cdd\u003e4.3L V6, 155–205 HP; 5.0L–6.2L V8, 180–300 HP\u003c\/dd\u003e\n    \u003cdt\u003eListed model years\u003c\/dt\u003e\n\u003cdd\u003e1998–2009\u003c\/dd\u003e\n    \u003cdt\u003eReplacement type\u003c\/dt\u003e\n\u003cdd\u003eAftermarket replacement belt\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\u003cli\u003e1 × serpentine belt\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSafety first:\u003c\/strong\u003e Switch off the engine, remove the ignition key, and disconnect the battery according to the boat and engine manufacturer's safety procedures.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDocument the routing:\u003c\/strong\u003e Photograph or diagram the existing belt path before removal. Do not rely on memory alone.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRelease belt tension:\u003c\/strong\u003e If the engine is equipped with an automatic tensioner, use the correct tool to release tension. If it uses an adjustable accessory mount, follow the applicable service procedure.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInspect related components:\u003c\/strong\u003e Check pulleys, tensioners, idlers, bearings, and accessory mounts for damage, seizure, contamination, or misalignment.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstall the belt:\u003c\/strong\u003e Route the belt around the correct pulleys without twisting it. Ensure every rib is fully seated in the pulley grooves.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSet and verify tension:\u003c\/strong\u003e Apply the manufacturer's specified tension where adjustment is required. Rotate the engine by hand as appropriate and recheck alignment before starting.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFinal check:\u003c\/strong\u003e Reconnect the battery, start the engine briefly in a safe, ventilated area, and confirm that the belt tracks smoothly without squealing, rubbing, or walking off a pulley.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eMaintenance and FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I confirm that this belt fits my engine?\u003c\/summary\u003e\n    \u003cp\u003eCheck the engine displacement, horsepower, model year, drive type, serial number, original belt reference, belt width, and belt length. Also compare the routing and accessory layout. A similar engine displacement does not by itself confirm compatibility.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the signs of a worn serpentine belt?\u003c\/summary\u003e\n    \u003cp\u003eInspect for cracking, fraying, glazing, missing ribs, oil contamination, uneven wear, looseness, or rib separation. Squealing, chirping, belt dust, and inconsistent accessory operation can also indicate belt or pulley problems.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an OEM Mercury or MerCruiser belt?\u003c\/summary\u003e\n    \u003cp\u003eNo. This is an aftermarket replacement belt listed against the Mercury\/MerCruiser and Sierra reference numbers shown above. Mercury and MerCruiser are trademarks of their respective owners.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this listing include an idler pulley or tensioner?\u003c\/summary\u003e\n    \u003cp\u003eNo. This listing includes one serpentine belt only. An idler pulley, tensioner, and other accessories are not included.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the belt be replaced?\u003c\/summary\u003e\n    \u003cp\u003eInspect the belt during routine engine maintenance and replace it when wear, contamination, damage, abnormal noise, or loss of tension is found. Follow the engine manufacturer's maintenance recommendations for inspection intervals.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I install this belt without checking the serial number?\u003c\/summary\u003e\n    \u003cp\u003eIt is not recommended. The listed engine families can use different belt arrangements depending on drive, accessory, and serial-number conditions. Verify the complete application before installation.\u003c\/p\u003e\n  \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 original belt number, dimensions, routing, engine serial number, drive type, and accessory configuration before ordering.\u003c\/li\u003e\n    \u003cli\u003eDo not operate the engine with a misaligned, damaged, contaminated, or incorrectly tensioned belt.\u003c\/li\u003e\n    \u003cli\u003eDisconnect the battery and keep hands, clothing, and tools away from moving pulleys during installation and testing.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended when the belt routing or tensioning system is unfamiliar.\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-focused parts:\u003c\/strong\u003e We supply replacement components for recreational and commercial marine applications.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eApplication-conscious listings:\u003c\/strong\u003e We provide reference numbers and fitment information to help customers compare their original parts.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGlobal fulfillment:\u003c\/strong\u003e Standard and expedited delivery options are available where supported at checkout.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723790061883,"sku":"23BL264","price":41.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/23BL264_1.jpg?v=1763031844"}],"url":"https:\/\/seasierra.com\/collections\/mercruiser-4-stroke-190-377hp-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}