{"title":"MerCruiser 4-Stroke Marine Engine 190-350 HP","description":"\u003csection id=\"hero\" style=\"padding:16px; border:1px solid #e5e5e5; border-radius:8px;\"\u003e\n  \u003cp\u003eThis page is for MerCruiser 4‑Stroke marine engines in the 190–350 HP range. Use it to find compatible parts and service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse our main MerCruiser collection at any time. 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.\u003c\/p\u003e\n  \u003cp\u003e\n    \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block; padding:10px 14px; background:#003366; 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=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 190–350 HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eFind serial numbers: engine (often on the flame arrestor or starboard block), transom assembly, and drive unit. Record all three—many parts are drive‑specific (Alpha, Bravo Two, Bravo Three).\u003c\/li\u003e\n    \u003cli\u003eDecode the model: displacement (e.g., 4.3L V6; 5.0\/5.7\/6.2L V8), fuel system (carb\/TKS vs. EFI\/MPI), and drive family. Suffixes can indicate revision level or emissions variant.\u003c\/li\u003e\n    \u003cli\u003eDistinguish platforms: V6 4.3L engines commonly around 190–220 HP; V8 families span roughly 220–350 HP. Carbureted models may feature Turn‑Key Starting (TKS); later models often use EFI\/MPI.\u003c\/li\u003e\n    \u003cli\u003eNote cooling and charging: some packages include closed‑cooling; alternator outputs vary by model. This affects thermostat, pump, and electrical parts selection.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eEngine Platform Overview\u003c\/h2\u003e\n  \u003ch3\u003eV6 4.3L (approx. 190 HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; max-width:900px; 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 #f0f0f0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003e4‑stroke V6, carbureted (TKS on many carb models) or EFI depending on year; typically 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 #f0f0f0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003e4.3 TKS (190 HP) and various 4.3L EFI\/MPI variants (availability by year).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eCompact package, good fuel economy for the class, strong mid‑range torque. Widely supported parts availability.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eImpellers, filters, anodes, and ignition parts often carry across multiple 4.3L variants, but verify by engine and drive serial numbers. TKS enrichment aids cold starts on carb models.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3 style=\"margin-top:20px;\"\u003eV8 5.0L–6.2L (approx. 220–350 HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; max-width:900px; 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 #f0f0f0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003e4‑stroke V8, offered in carb and EFI\/MPI variants across generations; commonly matched to Bravo Two\/Three for heavier boats, Alpha on some packages.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003e5.0L (carb\/MPI), 5.7L\/350 (carb\/MPI), and 6.2L series in various output ratings (typical peak up to ~350 HP depending on year\/configuration).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eHigher torque for planing larger hulls, wide prop and drive ratio options, robust charging for onboard electronics.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eRaw‑water pump location can be crank‑ or belt‑driven; verify before ordering impellers\/pump kits. Anode kits and prop fitment depend on Alpha vs. Bravo drives.\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=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for MerCruiser 4‑stroke sterndrive packages. Always confirm procedures and specifications with the official service manual for your exact engine and drive.\u003c\/p\u003e\n  \u003ctable style=\"width:100%; max-width:1000px; 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 #f5f5f5;\"\u003eEngine oil + filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eUse marine‑grade oil meeting MerCruiser specs (e.g., 25W‑40). Warm engine before draining.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\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 #f5f5f5;\"\u003eGear oil (drive)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eCheck for water intrusion and metal on magnet; service during haul‑out.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\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 #f5f5f5;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eInspect 100 hrs; replace 300 hrs\/3 seasons\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eUse correct heat range and gap for V6 vs V8 and EFI vs carb setups.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\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 #f5f5f5;\"\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eEvery 100 hours or each season\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eReplace more often with ethanol fuel or contamination issues.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\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 #f5f5f5;\"\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003e2 seasons or 200 hours (inspect annually)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eCritical for cooling; shorten interval in sandy\/silty water.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\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 #f5f5f5;\"\u003eAnodes (corrosion protection)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eInspect monthly; replace at ~50% depletion\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eMatch alloy to water type (zinc, aluminum, magnesium).\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\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 #f5f5f5;\"\u003eExhaust\/drive bellows\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eInspect annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003eCracks or pinholes risk water intrusion to the boat\/drive.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f5f5f5;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bellow\"\u003eBellows\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eSerpentine\/alternator belt\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eInspect every 50 hours; replace if worn\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eLook for glazing, ribs cracking, or fraying; tension per spec.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\"\u003eBelts\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=\"margin-top:24px;\"\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 \u0026amp; Electrical – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-alternators\"\u003eMerCruiser Alternators\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/starters\"\u003eStarters\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\u003eSealing \u0026amp; Gaskets – \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=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%; max-width:1000px; 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 #f0f0f0;\"\u003eOverheat alarm or weak raw‑water flow\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eDebris on drive water inlets, worn impeller, thermostat sticking, collapsed hoses.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eWater pump impeller\/kit, pump housing, thermostat, intake screens\/strainers.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eFuel filter clog, stale fuel, fouled plugs, damaged or incorrect‑pitch prop.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eFuel filter, spark plugs, propeller, fuel pump.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eOn carb: TKS\/choke operation, idle mixture; on EFI\/MPI: IAC valve and vacuum leaks; verify base timing.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eSpark plugs, fuel filter, IAC valve, ignition components.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eCheck gear oil level\/condition, water intrusion, prop shaft seal, drive alignment and gimbal bearing.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eGear lube, seal kit, bearings, gaskets.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eLow charging voltage\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eInspect belt condition\/tension, alternator output, wiring connections and grounds.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eAlternator, belt, regulator\/rectifier (as applicable), electrical connectors.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between V6 and V8 or different drive families?\u003c\/summary\u003e\n    \u003cp\u003eSome service parts (anodes, filters, impellers) overlap, but many components depend on displacement, fuel system, and drive type (Alpha vs. Bravo). Always confirm with engine and drive serial numbers before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the raw‑water impeller?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule of thumb, inspect annually and replace every 2 seasons or ~200 hours—sooner if operating in sandy or silty water, or if any overheat\/flow issues appear.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eService the drive lube every 100 hours or annually. Inspect for milkiness (water) or metal on the drain plug magnet; resolve seal or bearing issues before reuse.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the engine serial, transom assembly serial, and drive serial, plus photos of the nameplate and the part being replaced. Noting displacement (4.3\/5.0\/5.7\/6.2), fuel system (carb\/TKS vs. EFI\/MPI), and drive family (Alpha\/Bravo) speeds up verification.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"margin-top:24px; padding:16px; border-top:1px solid #eee;\"\u003e\n  \u003cp\u003eReady to find the right parts? Browse our 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:#003366; color:#fff; text-decoration:none; border-radius:6px;\"\u003eShop MerCruiser Parts\u003c\/a\u003e\u003c\/p\u003e\n  \u003cp style=\"color:#555;\"\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":"serpentine-belt-fits-mercruiser-4-3l-5-0l-5-7l-v6-v8-alpha-engines-replaces-57-861758q","title":"Serpentine Belt for MerCruiser Alpha 4.3L, 5.0L, 5.7L and 350 Mag Engines – Sierra 18-15116","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003eserpentine belt\u003c\/strong\u003e is designed for specified MerCruiser Alpha applications, including 4.3L, 5.0L, 5.7L and 350 Mag engines. It is listed as Sierra \u003cstrong\u003e18-15116\u003c\/strong\u003e and cross-referenced to MerCruiser belt numbers \u003cstrong\u003e57-861758\u003c\/strong\u003e and \u003cstrong\u003e57-861758Q\u003c\/strong\u003e. The belt is used with the applicable accessory-drive arrangement and is intended for engines equipped with a metal 5-3\/4-inch power-steering pump pulley and standard cooling where noted by the application.\u003c\/p\u003e\n\u003cp\u003eAlways match the complete engine model, year and serial-number range before ordering. Belt applications can vary by engine family, cooling configuration, pulley arrangement and accessory layout.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRibbed serpentine belt for the MerCruiser accessory drive.\u003c\/li\u003e\n  \u003cli\u003eListed for selected MerCruiser Alpha and 350 Mag Alpha applications.\u003c\/li\u003e\n  \u003cli\u003eApplication-specific fitment includes the engine serial ranges shown below.\u003c\/li\u003e\n  \u003cli\u003eAftermarket replacement for the listed MerCruiser belt references; not a genuine MerCruiser-branded part.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThe following numbers are the documented product and manufacturer cross-references for this belt.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand or source\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-15116\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e57-861758\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e57-861758Q\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e861758A1\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e861758Q\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e8M0150824\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\u003eUse the engine model, production year and serial number together when confirming fitment. The listed applications use serpentine belt 18-15116 \/ MerCruiser reference 57-861758.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eSerial-number range\u003c\/th\u003e\n        \u003cth\u003eBelt reference\u003c\/th\u003e\n        \u003cth\u003eApplication notes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e4.3L Alpha\u003c\/td\u003e\n        \u003ctd\u003e1996–1999\u003c\/td\u003e\n        \u003ctd\u003eOF803000–OL618999\u003c\/td\u003e\n        \u003ctd\u003e18-15116 \/ 57-861758\u003c\/td\u003e\n        \u003ctd\u003eMetal 5-3\/4-inch power-steering pump pulley; standard cooling application.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e5.0L Alpha\u003c\/td\u003e\n        \u003ctd\u003e1998–1999\u003c\/td\u003e\n        \u003ctd\u003eOL012052–OL618999\u003c\/td\u003e\n        \u003ctd\u003e18-15116 \/ 57-861758\u003c\/td\u003e\n        \u003ctd\u003eMetal 5-3\/4-inch power-steering pump pulley; standard cooling application.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e5.7L Alpha\u003c\/td\u003e\n        \u003ctd\u003e1997–1999\u003c\/td\u003e\n        \u003ctd\u003eOK001501–OL618999\u003c\/td\u003e\n        \u003ctd\u003e18-15116 \/ 57-861758\u003c\/td\u003e\n        \u003ctd\u003eMetal 5-3\/4-inch power-steering pump pulley; standard cooling application.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e350 Mag Alpha\u003c\/td\u003e\n        \u003ctd\u003e1997–2004\u003c\/td\u003e\n        \u003ctd\u003eOK001501–OL618999\u003c\/td\u003e\n        \u003ctd\u003e18-15116 \/ 57-861758\u003c\/td\u003e\n        \u003ctd\u003eConfirm the pulley, cooling-system and accessory configuration before purchase.\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\u003eMarine serpentine belt\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eMerCruiser stern-drive \/ out-drive accessory drive\u003c\/dd\u003e\n  \u003cdt\u003eBelt Type\u003c\/dt\u003e\n  \u003cdd\u003eRibbed serpentine belt\u003c\/dd\u003e\n  \u003cdt\u003eListed Belt Length\u003c\/dt\u003e\n  \u003cdd\u003e86.75 inches\u003c\/dd\u003e\n  \u003cdt\u003eListed Belt Width\u003c\/dt\u003e\n  \u003cdd\u003e13\/16 inch\u003c\/dd\u003e\n  \u003cdt\u003eApplication Configuration\u003c\/dt\u003e\n  \u003cdd\u003eMetal 5-3\/4-inch power-steering pump pulley and standard cooling where specified\u003c\/dd\u003e\n  \u003cdt\u003eColor\u003c\/dt\u003e\n  \u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eAftermarket Reference\u003c\/dt\u003e\n  \u003cdd\u003eSierra 18-15116\u003c\/dd\u003e\n  \u003cdt\u003eMerCruiser References\u003c\/dt\u003e\n  \u003cdd\u003e57-861758, 57-861758Q, 861758A1, 861758Q and 8M0150824\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 Serpentine belt\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eConfirm the engine model, year, serial number and accessory configuration before installation.\u003c\/li\u003e\n  \u003cli\u003eTurn the engine off, allow it to cool completely and disconnect the negative battery cable.\u003c\/li\u003e\n  \u003cli\u003ePhotograph or document the existing belt-routing path before removing the old belt.\u003c\/li\u003e\n  \u003cli\u003eRelease the belt tensioner or accessory adjustment as required by the specific engine configuration.\u003c\/li\u003e\n  \u003cli\u003eRemove the old belt and inspect the pulleys for wobble, damage, corrosion, contamination or damaged grooves.\u003c\/li\u003e\n  \u003cli\u003eRoute the replacement belt around the pulleys according to the engine service information. Make sure every rib is fully seated.\u003c\/li\u003e\n  \u003cli\u003eRestore the specified belt tension and rotate the engine by hand, where appropriate, to verify correct tracking.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, start the engine and observe the belt briefly for tracking, noise or slippage. Stop the engine immediately if the belt does not run correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm that this belt fits my engine?\u003c\/summary\u003e\n  \u003cp\u003eMatch your MerCruiser engine model, year and complete serial-number range to the compatibility table. Also verify the pulley and cooling-system configuration. If any of these details differ, consult the engine service information before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhich belt references does this part replace?\u003c\/summary\u003e\n  \u003cp\u003eThis aftermarket belt is listed as Sierra 18-15116 and cross-referenced to MerCruiser numbers 57-861758 and 57-861758Q. Additional documented MerCruiser references include 861758A1, 861758Q and 8M0150824.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are signs that the serpentine belt needs replacement?\u003c\/summary\u003e\n  \u003cp\u003eInspect the belt for cracking, fraying, glazing, missing ribs, contamination or abnormal wear. Squealing, chirping, poor accessory operation or visible belt misalignment can also indicate a belt, pulley or tension problem.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes this belt fit later MerCruiser Alpha engines?\u003c\/summary\u003e\n  \u003cp\u003eNot necessarily. The listed 4.3L, 5.0L and 5.7L Alpha applications are limited to the years and serial ranges shown. Later engines may use different belt references, so do not rely on engine displacement alone.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM MerCruiser belt?\u003c\/summary\u003e\n  \u003cp\u003eNo. This is an aftermarket replacement belt listed against the MerCruiser references shown above. MerCruiser and related manufacturer names and part numbers are used only to identify application and cross-reference information.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I use this belt with modified accessories?\u003c\/summary\u003e\n  \u003cp\u003eModified accessory drives, different pulleys, high-output alternators or other non-standard equipment may require a different belt length or configuration. Verify the complete drive arrangement before installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should a marine serpentine belt be inspected?\u003c\/summary\u003e\n  \u003cp\u003eInspect the belt during regular maintenance and before extended operation. Follow the engine manufacturer's service information for replacement intervals and inspect more frequently in severe, wet or contaminated operating conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShipping speed and cost?\u003c\/summary\u003e\n  \u003cp\u003eTypical transit is 5–15 days depending on destination and service selected. Available shipping methods and costs are shown at checkout.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty and returns?\u003c\/summary\u003e\n  \u003cp\u003eReturns and any applicable warranty are handled according to the current store policy. Contact support with your order details if you need assistance.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eDo not work on a running engine or attempt belt removal while components are hot or moving.\u003c\/li\u003e\n  \u003cli\u003eVerify the model, year, serial number, pulley arrangement and cooling configuration before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not install a belt that is contaminated, damaged or incorrectly sized.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not a genuine MerCruiser-branded component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended if the correct routing or tension procedure is uncertain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine-Focused Parts\u003c\/strong\u003e — We supply replacement components for marine propulsion and accessory systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Conscious Listings\u003c\/strong\u003e — Fitment information is organized around model, year and serial-number conditions where available.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGlobal Fulfillment\u003c\/strong\u003e — Standard and expedited shipping options are displayed at checkout where available.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723790029115,"sku":"24BL094","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/24BL094_1.jpg?v=1763031842"}],"url":"https:\/\/seasierra.com\/collections\/mercruiser-4-stroke-marine-engine-190-350-hp.oembed","provider":"SeaSierra","version":"1.0","type":"link"}