{"title":"Force 2-Stroke Outboard Engine 25-50HP Parts","description":"\u003csection id=\"hero\" style=\"max-width:980px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003cp\u003eThis page is tailored for Force 2‑Stroke 25–50HP outboard engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement categories, and troubleshooting guidance. You can also browse the main Force collection at any time. Scroll to the bottom of the 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  \u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\" style=\"display:inline-block;padding:10px 16px;border:1px solid #005ea2;border-radius:6px;text-decoration:none;color:#fff;background:#0077cc;\"\u003eBrowse All Force Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"max-width:980px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 25–50HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the identity plate: typically on the transom clamp bracket or swivel bracket. Record the model\/serial number stamped on the tag.\u003c\/li\u003e\n    \u003cli\u003eReading model codes: suffixes often indicate shaft length (S\/L\/XL), control type (tiller\/remote), and sometimes a year revision. Compare all characters when checking parts.\u003c\/li\u003e\n    \u003cli\u003ePlatform clues: most 25–50HP Force units are 2‑cylinder carbureted 2‑strokes; certain older 50HP variants may differ. Count spark plug leads and note carburetor layout to confirm.\u003c\/li\u003e\n    \u003cli\u003eEra differences: later Mercury‑era Force models share some components (ignition, gearcase items) with Mercury patterns. Match parts by serial and casting numbers where possible.\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:16px 12px;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n  \u003ch3\u003eInline‑2 Carbureted 2‑Stroke (common on 25–50HP)\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;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eInline‑2, carbureted 2‑stroke, premix fuel (50:1 typical; verify engine decal).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e25–50HP 2‑stroke Force models, including many 40\/50HP two‑cylinder variants from the late 1980s–1990s.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eLight weight, simple carburetion, responsive mid‑range.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eLater units may use Mercury‑pattern ignition\/gearcase components. Always match by serial and gearcase style when ordering parts.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eInline‑3 2‑Stroke (select earlier 50HP variants)\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;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eInline‑3 2‑stroke, carbureted. Less common in this HP band.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eSelect 50HP models in earlier production. Confirm by counting cylinders\/plug leads.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eSmooth idle for size class; potentially broader torque curve.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eParts such as carburetor kits and ignition pieces may be platform‑specific—verify model and serial details before purchase.\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:16px 12px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for typical recreational use. Always follow the official service manual for your exact model and operating environment.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eInspect for water intrusion\/metal. Reseal if contamination is found.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eUse correct heat range and gap; replace if fouled or worn.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\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:6px 4px;\"\u003eInline fuel filter\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eReplace more often with ethanol fuels or dirty tanks.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eEvery 2–3 seasons or 200 hours\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eReplace sooner if weak tell‑tale, overheat alarm, or sand use.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-water-pump-repair-kits\"\u003eForce Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eAnodes (zincs)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eInspect each haul‑out; replace when 50% gone\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eMatch alloy to water type (fresh\/brackish\/salt).\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003ePropeller \u0026amp; hardware inspection\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eEvery season\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCheck blades for dings and hub for damage; ensure correct pitch.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eLower unit seal kit (if water in oil)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eAs needed\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003ePressure\/vacuum test before reseal; replace worn seals.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-lower-unit-seal-kits\"\u003eForce Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eFuel lines \u0026amp; primer bulb\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eEvery 2–3 years\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eUse ethanol‑resistant hose; replace if cracked or soft.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/hoses\"\u003eHoses\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e2‑stroke fuel\/oil mixture\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eEvery fill‑up\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eMost Force engines: 50:1 (verify on cowl\/plate). Use TC‑W3 oil and fresh fuel.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\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:16px 12px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service: \u003ca href=\"https:\/\/seasierra.com\/collections\/force-water-pump-repair-kits\"\u003eForce Water Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eLower Unit Service: \u003ca href=\"https:\/\/seasierra.com\/collections\/force-lower-unit-seal-kits\"\u003eForce Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System: \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/hoses\"\u003eHoses\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical: \u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark plug\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System: \u003ca href=\"https:\/\/seasierra.com\/collections\/force-water-pump-repair-kits\"\u003eWater Pump Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropulsion \u0026amp; Hardware: \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/propeller-guards\"\u003ePropeller Guards\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eControls \u0026amp; Cables: \u003ca href=\"https:\/\/seasierra.com\/collections\/control-throttle-shift-cables\"\u003eThrottle \u0026amp; Shift Cables\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:16px 12px;\"\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;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eWeak tell‑tale or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eInspect intake screen, tell‑tale hose, thermostat; verify impeller age.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eWater pump kit, impeller, gaskets, thermostat\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCheck fuel quality, primer bulb firmness, fuel filter, and spark plug condition\/gap.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eSpark plugs, fuel filter, fuel lines, carburetor service kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCompression test, plug color, propeller damage or incorrect pitch.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003ePropeller, spark plugs, fuel pump, carburetor parts\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eExcessive smoke (2‑stroke)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eConfirm 50:1 premix (unless specified otherwise), choke not stuck, and carb flooding.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCarburetor needle\/seat, float, choke components\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCheck oil level\/condition; pressure test for leaks; inspect prop hub and shaft for damage.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eLower unit seal kit, bearings, shims, propeller hub\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:16px 12px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable across different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eSome later Force models share Mercury‑pattern components, but interchange varies by year, serial, and cylinder configuration. Always confirm by model\/serial and compare casting or component numbers before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the impeller?\u003c\/summary\u003e\n    \u003cp\u003eAs a preventive measure every 2–3 seasons (or ~200 hours). Replace sooner if the tell‑tale weakens, the engine overheats, or the motor is run in sandy or silty water.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should the lower unit gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eChange at least annually or every 100 hours. Inspect for water (milky oil) or metal debris; if present, perform a pressure\/vacuum test and reseal the gearcase.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide model and serial numbers, horsepower, shaft length, and a clear photo of the nameplate. Photos of the target area (e.g., gearcase, carburetor, ignition module) also help match parts accurately.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"max-width:980px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003cp\u003eReady to find parts? Browse the main Force collection and narrow by horsepower, year, and model.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\" style=\"display:inline-block;padding:10px 16px;border:1px solid #005ea2;border-radius:6px;text-decoration:none;color:#fff;background:#0077cc;\"\u003eShop Force Outboard Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px;color:#444;\"\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":"water-pump-impeller-fits-mercury-mariner-15-50-hp-replaces-47-8508910","title":"Water Pump Impeller for Mercury\/Mariner 2-Stroke 15–30 HP and Select 4-Stroke Models","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 aftermarket \u003cstrong\u003ewater pump impeller\u003c\/strong\u003e is designed for specified Mercury and Mariner outboard applications. The company fitment records identify this impeller for Mercury\/Mariner 2-stroke 15–30 HP engines and the listed 4-stroke models below. It is intended as a direct replacement for the original water-pump impeller when the engine, model, stroke type, and part-number reference match.\u003c\/p\u003e\n\u003cp\u003eThe primary replacement references documented for this impeller are Mercury part numbers \u003cstrong\u003e47-85089-3\u003c\/strong\u003e, \u003cstrong\u003e47-85089-10\u003c\/strong\u003e, \u003cstrong\u003e47-85089\u003c\/strong\u003e, and \u003cstrong\u003e47-8508910\u003c\/strong\u003e. Sierra \u003cstrong\u003e18-3057\u003c\/strong\u003e and Mallory \u003cstrong\u003e9-45303\u003c\/strong\u003e are listed as aftermarket reference numbers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSingle aftermarket water pump impeller; not a complete repair kit.\u003c\/li\u003e\n  \u003cli\u003eDesigned for the specified Mercury and Mariner 2-stroke and 4-stroke applications.\u003c\/li\u003e\n  \u003cli\u003eHigh-volume, long-vane impeller configuration associated with the documented 47-85089-10 reference.\u003c\/li\u003e\n  \u003cli\u003eConfirm the original impeller, engine model, stroke type, and part number before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse these references for identification and cross-checking. Number listings are reference information and 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\u003eRole\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e47-85089-3\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e47-85089-10\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e47-85089\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e47-8508910\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\u003e18-3057\u003c\/td\u003e\n\u003ctd\u003eAftermarket reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-45303\u003c\/td\u003e\n\u003ctd\u003eAftermarket 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 company fitment records cover the following application groups. For the 2-stroke range, verify the exact engine model and serial-number range because the supplied company data identifies the range by horsepower only.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Mercury and Mariner Engine Compatibility\"\u003e\n    \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eModel or Description\u003c\/th\u003e\n\u003cth\u003eFitment Note\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e15–30 HP\u003c\/td\u003e\n\u003ctd\u003eSpecified 2-stroke outboards\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model and serial number.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e8 HP\u003c\/td\u003e\n\u003ctd\u003eBodensee; internal application listing\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e9.9 HP\u003c\/td\u003e\n\u003ctd\u003e323 cc\u003c\/td\u003e\n\u003ctd\u003eInternational or model-specific application; confirm exact model.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e13.5 HP\u003c\/td\u003e\n\u003ctd\u003eInternational\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e15 HP\u003c\/td\u003e\n\u003ctd\u003eSpecified 4-stroke model\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e25 HP\u003c\/td\u003e\n\u003ctd\u003eSpecified 4-stroke model\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e30 HP\u003c\/td\u003e\n\u003ctd\u003eStandard and 3-cylinder EFI applications\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e40 HP\u003c\/td\u003e\n\u003ctd\u003eStandard, 3-cylinder carbureted, Italy, and specified 3-cylinder EFI applications\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e45 HP\u003c\/td\u003e\n\u003ctd\u003eBodensee\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e50 HP\u003c\/td\u003e\n\u003ctd\u003eStandard and Bigfoot\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model.\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\u003eWater pump impeller\u003c\/dd\u003e\n  \u003cdt\u003eProduct Configuration\u003c\/dt\u003e\n\u003cdd\u003eSingle impeller\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eMercury \/ Mariner outboard cooling systems\u003c\/dd\u003e\n  \u003cdt\u003eVane Configuration\u003c\/dt\u003e\n\u003cdd\u003eHigh-volume, long-vane design\u003c\/dd\u003e\n  \u003cdt\u003eOutside Diameter\u003c\/dt\u003e\n\u003cdd\u003eApproximately 73.0 mm (2.875 in)\u003c\/dd\u003e\n  \u003cdt\u003eInside Diameter\u003c\/dt\u003e\n\u003cdd\u003eApproximately 16.0 mm (0.625 in)\u003c\/dd\u003e\n  \u003cdt\u003eHeight\u003c\/dt\u003e\n\u003cdd\u003eApproximately 12.6 mm\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Water pump impeller\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The company record identifies this product as a single impeller, not a kit. A key, gasket, washers, O-rings, wear plate, and other water-pump service parts are not included unless separately stated in the order details.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eVerify the engine model, stroke type, serial number, and original impeller reference before beginning work.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the battery and follow the outboard manufacturer’s service procedure for removing the lower unit.\u003c\/li\u003e\n  \u003cli\u003eRemove the water-pump housing and take out the old impeller.\u003c\/li\u003e\n  \u003cli\u003eInspect the housing, wear plate, keyway, gaskets, O-rings, and related components for wear or damage. Replace service parts as required.\u003c\/li\u003e\n  \u003cli\u003eClean the housing and mating surfaces before installing the replacement impeller.\u003c\/li\u003e\n  \u003cli\u003eInstall the impeller using the correct key and orient the vanes in the direction specified by the engine manufacturer.\u003c\/li\u003e\n  \u003cli\u003eReassemble the water pump and lower unit using the manufacturer’s torque specifications.\u003c\/li\u003e\n  \u003cli\u003eRun the engine according to the manufacturer’s testing procedure and confirm proper cooling-water flow before normal operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eMaintenance \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm that this impeller fits my engine?\u003c\/summary\u003e\n  \u003cp\u003eMatch your engine brand, horsepower, stroke type, exact model, and serial number to the compatibility information. Also compare the original impeller and its manufacturer reference with the documented references, including Mercury 47-85089-3 or 47-85089-10 and Sierra 18-3057.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this a complete water-pump kit?\u003c\/summary\u003e\n  \u003cp\u003eNo. This product is a single aftermarket water pump impeller. It does not include a key, gasket, washers, O-rings, wear plate, housing, or other repair-kit components.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a worn water-pump impeller?\u003c\/summary\u003e\n  \u003cp\u003ePossible signs include weak cooling-water flow, overheating warnings, or overheating during operation. Inspect the complete cooling system because water-flow problems can have causes other than the impeller.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShould the key and gaskets be replaced at the same time?\u003c\/summary\u003e\n  \u003cp\u003eInspect the key, housing, wear plate, gaskets, and O-rings during service. Replace any worn, damaged, hardened, or distorted components with parts appropriate for the specific engine.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM component?\u003c\/summary\u003e\n  \u003cp\u003eNo. This is an aftermarket replacement impeller. The OEM and aftermarket numbers shown on this page are reference numbers for identification only.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eDo not rely on horsepower alone. Confirm the exact model, stroke type, serial number, and original part number.\u003c\/li\u003e\n  \u003cli\u003eDo not install this impeller if its dimensions, keyway, vane configuration, or reference markings differ from the original part without professional verification.\u003c\/li\u003e\n  \u003cli\u003eFollow the outboard manufacturer’s service manual and torque specifications.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when lower-unit or water-pump service is unfamiliar.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — Practical aftermarket components for routine marine maintenance and repair.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Product references and fitment information are provided to support careful part identification.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomer Support\u003c\/strong\u003e — Contact support with your engine model, serial number, and original part information when application assistance is needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723786228027,"sku":"17IM007","price":15.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_for_Mercury_15-50_HP_47-8508910_-_0755466_-_JLM_MARINE-8289726.jpg?v=1763031719"}],"url":"https:\/\/seasierra.com\/collections\/force-2-stroke-outboard-engine-25-50hp-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}