{"title":"Mercury 2-Stroke 3.5-9.8HP Outboard Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1100px;margin:0 auto 20px auto\"\u003e\n  \u003cp\u003eDedicated to Mercury 2‑Stroke 3.5–9.8HP outboard engines, this page helps you find compatible parts and service information. Inside you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Mercury collection for a wider selection. Scroll down to the bottom of this page to start browsing parts for this engine, and remember that on the collection page you can 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\/mercury-outboard-parts\" style=\"display:inline-block;padding:10px 16px;background:#111827;color:#fff;text-decoration:none;border-radius:6px\"\u003eBrowse All Mercury Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"max-width:1100px;margin:0 auto 24px auto\"\u003e\n  \u003ch2\u003eHow to Identify Your 3.5–9.8HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the serial\/model plate on the transom bracket or swivel bracket. On small tiller models it’s typically on the port side clamp bracket.\u003c\/li\u003e\n    \u003cli\u003eModel code suffixes usually indicate shaft length and features: S (short 15\"), L (long 20\"), rope vs. electric start, and tiller vs. remote control. Verify against the serial number range.\u003c\/li\u003e\n    \u003cli\u003eThese are 2‑stroke carbureted engines. 3.5–4HP are commonly single‑cylinder; 6–9.8HP are typically twin‑cylinder. Count spark plugs and look at the cylinder head to distinguish platforms.\u003c\/li\u003e\n    \u003cli\u003eSome later small Mercury 2‑strokes share components with Tohatsu‑built variants. Always match parts by serial number and lower‑unit style (short vs. long shaft).\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"max-width:1100px;margin:0 auto 24px auto\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n  \u003ch3\u003e3.5–4HP Single‑Cylinder 2‑Stroke\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eAir‑cooled cowling with water‑cooled leg; single‑cylinder, carbureted 2‑stroke with manual start and tiller steering.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003e3.5HP and 4HP 2‑Stroke tiller models in short (15\") and long (20\") shaft variants.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eVery light and portable; simple carburetor and ignition; easy dockside service.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eMatch impeller kits and gearcase seals to shaft length and serial range; some parts interchange with equivalent Tohatsu‑built units.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003e6–9.8HP Twin‑Cylinder 2‑Stroke\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eInline twin, carbureted 2‑stroke; manual or electric start; tiller or remote options.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003e6HP, 7.5HP, 8HP, and 9.8HP 2‑Stroke families in S\/L shaft variants.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eGood low‑end torque for small inflatables and dinghies; simple maintenance; widely available service parts.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eImpeller and seal kits vary by lower‑unit generation; verify prop hub style and exhaust configuration before ordering.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"max-width:1100px;margin:0 auto 24px auto\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for 2‑stroke portable outboards. Always follow the official Mercury service manual for your exact model and serial number.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eLower Unit Gear Oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eInspect for water intrusion (milky oil). Replace seals if contamination is present.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\"\u003eMercury Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eSpark Plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eInspect 50 hours; replace annually or as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eCheck gap and insulator color; replace if fouled or worn.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\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 #f3f4f6\"\u003eInline Fuel Filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003e50–100 hours\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eReplace if restricted or after contaminated fuel events.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\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:8px;border-bottom:1px solid #f3f4f6\"\u003eWater Pump Impeller \/ Kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eEvery 2 seasons or 100 hours\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eShorter intervals in sandy\/silty water or if telltale weakens.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-water-pump-repair-kits\"\u003eMercury Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eAnodes (Zinc\/Aluminum\/Magnesium)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eInspect 50 hours; replace when 50% consumed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eChoose anode material for your water type (salt\/brackish\/fresh).\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\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:8px;border-bottom:1px solid #f3f4f6\"\u003eFuel\/Oil Mix (2‑Stroke)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eEvery fill‑up\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eUse fresh gasoline and TC‑W3 outboard oil at the ratio specified in your manual (many models use 50:1). Service oil injection if equipped.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\"\u003eMercury Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003ePropeller \u0026amp; Cotter\/Lock Hardware\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eInspect 50 hours or after impact\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eCheck for dings, bent blades, and proper nut\/cotter security.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\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:1100px;margin:0 auto 24px auto\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eCooling System – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-water-pump-repair-kits\"\u003eMercury Water Pump Repair 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\/carburetor\"\u003eCarburetor\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical – \u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase \u0026amp; Seals – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\"\u003eMercury Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGaskets \u0026amp; Oil Seals – \u003ca href=\"https:\/\/seasierra.com\/collections\/gaskets\"\u003eGaskets\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/oil-seals\"\u003eOil Seals\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropellers \u0026amp; Hardware – \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection – \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"max-width:1100px;margin:0 auto 24px auto\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eWeak telltale stream \/ overheat\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eClear intake screen; verify telltale hose; inspect impeller and wear plate; confirm thermostat operation (if equipped).\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eWater pump kit, thermostat, intake screen\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eFresh fuel; correct choke\/enrichment; clean carb jets; check spark plug gap\/condition; inspect inline fuel filter.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eFuel filter, carburetor repair components, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eProp damage or wrong pitch; fouled plugs; restricted fuel delivery; exhaust obstruction.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003ePropeller, spark plugs, fuel filter, gaskets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eExcessive smoke (2‑stroke)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eConfirm correct fuel\/oil ratio; check for stuck choke; clean carb; verify plug heat range.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eSpark plugs, carburetor kit, gaskets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eGearcase noise \/ metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eDrain gear oil and inspect; pressure\/vacuum test; check propshaft for fishing line; inspect seals and bearings.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6\"\u003eLower unit seal kit, bearings, propeller hardware\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"max-width:1100px;margin:0 auto 24px auto\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between years or between the 3.5–4HP and 6–9.8HP platforms?\u003c\/summary\u003e\n    \u003cp\u003eSome components interchange within a platform and serial range, and certain small Mercury 2‑strokes share parts with Tohatsu‑built equivalents. However, water pump and gearcase parts often differ by shaft length and generation. Always confirm by serial number and lower‑unit style.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the water pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule of thumb, every 2 seasons or 100 hours—sooner if you run in sandy or shallow water, or if the telltale weakens. Replace the full kit (impeller, wear plate, seals) when wear is evident.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change lower unit gear oil?\u003c\/summary\u003e\n    \u003cp\u003eChange every 100 hours or annually. If the oil looks milky or contaminated, address seal issues immediately and replace the oil after repairs.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information do you need to confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003ePlease provide the engine’s serial number, horsepower, shaft length (S\/L), and any key options (manual vs. electric start, tiller vs. remote). Photos of the lower unit and nameplate also help ensure an exact match.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1100px;margin:0 auto 36px auto\"\u003e\n  \u003cp\u003eReady to find parts for your Mercury 2‑Stroke 3.5–9.8HP? Browse the main Mercury collection and filter by horsepower, year, and model to locate compatible components.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\" style=\"display:inline-block;margin-top:8px;padding:10px 16px;background:#111827;color:#fff;text-decoration:none;border-radius:6px\"\u003eShop Mercury Outboard Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px;color:#374151\"\u003eIf you’re unsure about your model, send us a clear 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-3-5-9-8-hp-replaces-47-89980-47-68988","title":"Aftermarket Water Pump Impeller with Key for Mercury\/Mariner 2-Stroke 3.5–9.8 HP, 0.438 in Shaft – Replaces 47-68988, 47-89980","description":"\u003csection\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eaftermarket water pump impeller with key\u003c\/strong\u003e is designed for selected Mercury and Mariner 2-stroke outboard applications from 3.5 HP through 9.8 HP. It is intended to restore water-pump circulation and help maintain proper engine cooling when the original impeller is worn, damaged, or hardened.\u003c\/p\u003e\n\u003cp\u003eThe impeller is specified for a \u003cstrong\u003e0.438-inch shaft fit\u003c\/strong\u003e and replaces the listed Mercury references \u003cstrong\u003e47-68988\u003c\/strong\u003e, \u003cstrong\u003e47-89980\u003c\/strong\u003e, and \u003cstrong\u003e47-89980T1\u003c\/strong\u003e. The aftermarket reference associated with this product is \u003cstrong\u003eSierra 18-3054\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAftermarket replacement impeller for selected Mercury and Mariner 2-stroke outboards.\u003c\/li\u003e\n  \u003cli\u003eIncludes the matching key supplied with this product.\u003c\/li\u003e\n  \u003cli\u003eDesigned for applications using a 0.438-inch shaft or impeller bore specification.\u003c\/li\u003e\n  \u003cli\u003eConfirm the exact model, serial-number range, shaft size, and original impeller before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the following references to compare the impeller against your original part and service information. These numbers identify reference or interchange applications; they do not replace the need to verify the engine model and shaft specification.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand or Reference\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eReference Type\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-68988\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\u003e47-89980\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\u003e47-89980T1\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\u003e18-3054\u003c\/td\u003e\n        \u003ctd\u003eAftermarket interchange reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e89980 \/ 68988\u003c\/td\u003e\n        \u003ctd\u003eShort-form reference numbers\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 record specifies Mercury and Mariner \u003cstrong\u003e2-stroke\u003c\/strong\u003e engines rated at \u003cstrong\u003e3.5, 3.6, 4, 4.5, 7.5, and 9.8 HP\u003c\/strong\u003e, provided the engine uses the required \u003cstrong\u003e0.438-inch shaft specification\u003c\/strong\u003e. Model names and serial-number ranges can vary within these horsepower groups, so verify the complete engine identification before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eEngine Type\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eShaft Specification\u003c\/th\u003e\n        \u003cth\u003eOEM Reference\u003c\/th\u003e\n        \u003cth\u003eFitment Note\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \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\u003e3.5\u003c\/td\u003e\n        \u003ctd\u003e0.438 in\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eVerify model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e3.6\u003c\/td\u003e\n        \u003ctd\u003e0.438 in\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eVerify model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e0.438 in\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eVerify model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e4.5\u003c\/td\u003e\n        \u003ctd\u003e0.438 in\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eVerify model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e7.5\u003c\/td\u003e\n        \u003ctd\u003e0.438 in\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eVerify model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e9.8\u003c\/td\u003e\n        \u003ctd\u003e0.438 in\u003c\/td\u003e\n        \u003ctd\u003e47-89980\u003c\/td\u003e\n        \u003ctd\u003eVerify model and serial number.\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\u003eWater pump impeller with key\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eSelected Mercury and Mariner 2-stroke outboards\u003c\/dd\u003e\n  \u003cdt\u003eRated Horsepower\u003c\/dt\u003e\n  \u003cdd\u003e3.5, 3.6, 4, 4.5, 7.5, and 9.8 HP applications\u003c\/dd\u003e\n  \u003cdt\u003eShaft or Bore Specification\u003c\/dt\u003e\n  \u003cdd\u003e0.438 inch\u003c\/dd\u003e\n  \u003cdt\u003eReplacement References\u003c\/dt\u003e\n  \u003cdd\u003eMercury 47-68988, 47-89980, and 47-89980T1\u003c\/dd\u003e\n  \u003cdt\u003eAftermarket Reference\u003c\/dt\u003e\n  \u003cdd\u003eSierra 18-3054\u003c\/dd\u003e\n  \u003cdt\u003eProduct Status\u003c\/dt\u003e\n  \u003cdd\u003eAftermarket replacement; not an OEM Mercury or Quicksilver part\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Water pump impeller\u003c\/li\u003e\n  \u003cli\u003e1 x Matching impeller key\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVerify fitment first:\u003c\/strong\u003e Confirm that your engine is a compatible Mercury or Mariner 2-stroke model rated at 3.5, 3.6, 4, 4.5, 7.5, or 9.8 HP and that the required shaft or bore specification is 0.438 inch.\u003c\/li\u003e\n  \u003cli\u003eDisconnect the battery, shut down the engine, and allow all components to cool before servicing.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit and water-pump cover according to the engine manufacturer's service procedure.\u003c\/li\u003e\n  \u003cli\u003eRemove the old impeller and key. Inspect the pump housing, wear surfaces, seals, and shaft for damage or excessive wear.\u003c\/li\u003e\n  \u003cli\u003eInstall the supplied key and impeller in the correct orientation. Lubricate the impeller and housing only with a lubricant approved for the application.\u003c\/li\u003e\n  \u003cli\u003eReassemble the water-pump components and lower unit using the correct service-manual procedures and torque specifications.\u003c\/li\u003e\n  \u003cli\u003eAfter installation, run the engine in a safe water supply and confirm a strong cooling-water discharge before normal operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if this impeller fits my specific engine?\u003c\/summary\u003e\n  \u003cp\u003eCheck all fitment conditions together: Mercury or Mariner brand, 2-stroke engine type, rated horsepower of 3.5, 3.6, 4, 4.5, 7.5, or 9.8 HP, the correct model and serial-number range, and the 0.438-inch shaft or bore specification. Do not rely on horsepower alone.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes this product include the key?\u003c\/summary\u003e\n  \u003cp\u003eYes. This product is supplied as a water pump impeller with the matching key.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhich part numbers does this impeller replace?\u003c\/summary\u003e\n  \u003cp\u003eThe listed Mercury references are 47-68988, 47-89980, and 47-89980T1. Sierra 18-3054 is an aftermarket reference associated with the same application. Always compare the original part and shaft specification before installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this impeller fit a 5 HP Mercury outboard?\u003c\/summary\u003e\n  \u003cp\u003eA 5 HP rating is not included in the supplied fitment record. Do not assume compatibility based on nearby horsepower ratings; verify the exact model, serial number, and shaft specification before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing water-pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs include overheating, reduced cooling-water flow, or little to no water discharge from the telltale. Stop using the engine if it overheats and inspect the cooling system before further operation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM Mercury or Quicksilver part?\u003c\/summary\u003e\n  \u003cp\u003eNo. This listing is for an aftermarket replacement impeller with key. Mercury and Quicksilver names and part numbers are used only to identify compatible reference applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the original impeller, shaft or bore size, engine model, and serial-number range before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not operate an outboard with inadequate cooling-water flow.\u003c\/li\u003e\n  \u003cli\u003eFollow the engine manufacturer's service procedures and use appropriate marine-safety practices during installation.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement part, not an OEM Mercury or Quicksilver component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when the correct lower-unit or water-pump service procedure 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\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine replacement parts selected for practical fitment and reliable service.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Support\u003c\/strong\u003e — Clear model, horsepower, and shaft-size information helps you select the correct replacement part.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — We offer aftermarket marine components at competitive prices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723963830587,"sku":"17IM005K","price":18.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_for_Mercury_35_36_4_45_75_98_HP_47-89980_-_JLM_MARINE-8288504.jpg?v=1763038515"},{"product_id":"water-pump-impeller-fits-mercury-mariner-3-5-9-8hp-replaces-47-22748","title":"Water Pump Impeller for Mercury\/Mariner 2-Stroke 3.5–6 HP – Replaces 47-22748","description":"\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003ewater pump impeller\u003c\/strong\u003e is designed for selected Mercury and Mariner 2-stroke outboards rated 3.5, 3.9, 5, and 6 HP. It replaces Mercury OEM part number \u003cstrong\u003e47-22748\u003c\/strong\u003e and aftermarket reference \u003cstrong\u003eSierra 18-3012\u003c\/strong\u003e. Replace a worn or damaged impeller to help restore proper water-pump circulation and cooling-system performance.\u003c\/p\u003e\n\u003cp\u003eThis listing is for one replacement impeller only. It is not an OEM Mercury component and does not include a water-pump housing, gasket, wear plate, drive key, or other installation hardware unless separately specified.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReplacement water pump impeller for selected Mercury and Mariner 2-stroke outboards.\u003c\/li\u003e\n\u003cli\u003eCompany-specified fitment: 3.5 HP, 3.9 HP, 5 HP, and 6 HP models.\u003c\/li\u003e\n\u003cli\u003eReplaces Mercury OEM reference 47-22748.\u003c\/li\u003e\n\u003cli\u003eSingle impeller supplied; verify the original part and engine identification before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\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\u003csection\u003e\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThese are customer-facing manufacturer and aftermarket reference numbers associated with this impeller. Cross-reference numbers are provided for identification; always confirm the complete engine model and serial number before installation.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eReference Type\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n        \u003ctd\u003eOEM replacement reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3012\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\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe company catalog specifies compatibility with Mercury and Mariner 2-stroke outboards in the 3.5, 3.9, 5, and 6 HP ranges. Horsepower alone is not sufficient to confirm fitment, so compare the complete model and serial number with your engine parts diagram before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Compatible Engine Models\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eFitment Notes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003e3.5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003e3.9\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003e5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n        \u003ctd\u003e6\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n        \u003ctd\u003eCatalog records include a Mercury 6 HP model 60 application with serial range 1408611 through 1916138.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Do not assume compatibility with 9.8 HP, 9.9 HP, or other models solely because they use a similar-looking impeller. Confirm the application against the engine's model and serial number.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n \u003cdd\u003eWater pump impeller\u003c\/dd\u003e\n \u003cdt\u003eApplication\u003c\/dt\u003e\n \u003cdd\u003eSelected Mercury and Mariner 2-stroke outboards\u003c\/dd\u003e\n \u003cdt\u003eRated HP Range\u003c\/dt\u003e\n \u003cdd\u003e3.5, 3.9, 5, and 6 HP\u003c\/dd\u003e\n \u003cdt\u003eOEM Replacement Reference\u003c\/dt\u003e\n \u003cdd\u003eMercury 47-22748\u003c\/dd\u003e\n \u003cdt\u003eAftermarket Reference\u003c\/dt\u003e\n \u003cdd\u003eSierra 18-3012\u003c\/dd\u003e\n \u003cdt\u003eProduct Configuration\u003c\/dt\u003e\n \u003cdd\u003eSingle replacement impeller\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n \u003cdd\u003eInstall according to the applicable engine service manual and water-pump assembly requirements.\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Water pump impeller\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWater-pump housing components, gaskets, wear plates, keys, pins, and other hardware are not included unless separately listed.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect the battery, remove the emergency-stop lanyard, and follow the safety procedures in the applicable service manual.\u003c\/li\u003e\n\u003cli\u003ePlace the outboard in neutral and remove the lower unit according to the manufacturer's procedure.\u003c\/li\u003e\n\u003cli\u003eLocate the water-pump housing and remove the cover and related components as specified by the service manual.\u003c\/li\u003e\n\u003cli\u003eRemove the old impeller and inspect the housing, wear plate, drive shaft, pin or key arrangement, and associated seals for wear or damage.\u003c\/li\u003e\n\u003cli\u003eClean debris and corrosion from the water-pump area before installing the replacement.\u003c\/li\u003e\n\u003cli\u003eInstall the impeller in the correct orientation for your engine's water-pump design. Do not force the impeller or omit any required pin, key, gasket, or seal.\u003c\/li\u003e\n\u003cli\u003eReassemble the water pump and lower unit using the manufacturer's torque specifications.\u003c\/li\u003e\n\u003cli\u003eTest the cooling-water flow with an appropriate flush attachment before operating the outboard on the water.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eInstallation should be performed by a qualified technician when the correct water-pump configuration or engine serial range is uncertain.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm this impeller fits my engine?\u003c\/summary\u003e\n  \u003cp\u003eConfirm that your engine is a Mercury or Mariner 2-stroke model rated 3.5, 3.9, 5, or 6 HP, then verify the complete model and serial number against the engine parts diagram. Also compare the old impeller's dimensions, hub, and drive-pin or key arrangement before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes this impeller fit a 9.8 or 9.9 HP outboard?\u003c\/summary\u003e\n  \u003cp\u003eThe company fitment for this product is limited to 3.5, 3.9, 5, and 6 HP 2-stroke applications. Do not use this listing for a 9.8 or 9.9 HP engine unless the exact engine parts catalog confirms the same replacement reference and application.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing water-pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs include weak or absent cooling-water flow, overheating, an overheat warning, or visible cracking, brittleness, deformation, or missing vanes when the impeller is inspected.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should I replace the impeller?\u003c\/summary\u003e\n  \u003cp\u003eReplacement intervals depend on the engine manufacturer's maintenance schedule and operating conditions. Inspect the impeller during scheduled service and replace it when it is worn, damaged, hardened, or when cooling-water flow is inadequate.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM Mercury part?\u003c\/summary\u003e\n  \u003cp\u003eNo. This is an aftermarket replacement impeller identified for use in applications that reference Mercury OEM part number 47-22748 and Sierra reference 18-3012.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes the package include a key, gasket, or water-pump kit?\u003c\/summary\u003e\n  \u003cp\u003eNo. This listing is for one impeller only. Confirm and purchase any required key, pin, gasket, seal, housing, or other water-pump components separately if they are not already serviceable on your engine.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify the engine brand, model, horsepower, stroke, and serial number before purchase.\u003c\/li\u003e\n\u003cli\u003eCompare the old impeller and the water-pump assembly, including the hub and drive-pin or key arrangement.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement, not an OEM Mercury component.\u003c\/li\u003e\n\u003cli\u003eNever operate an outboard without adequate cooling-water flow. Stop the engine immediately if overheating or a loss of telltale flow occurs.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended when the application or installation procedure is uncertain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — Replacement components for selected outboard and marine applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Product references and fitment information are provided to help customers compare parts before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomer Support\u003c\/strong\u003e — Contact support with your engine model and serial number if you need help checking an application.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723963863355,"sku":"17IM002","price":15.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_for_Mercury_39_-_98_HP_47-22748_-_JLM_MARINE-8289774.jpg?v=1763038518"},{"product_id":"water-pump-impeller-fits-mercury-marine-3-9-6-9-8-hp-replaces-mercury-marine-47-22748-sierra-marine-18-3074","title":"Aftermarket Water Pump Impeller with Key – for Mercury Mariner 2-Stroke 3.5, 3.9, 5 \u0026 6 HP – Replaces Mercury 47-22748","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 \u003cstrong\u003eaftermarket water pump impeller with key\u003c\/strong\u003e is designed for selected Mercury Mariner 2-stroke outboard engines rated at 3.5, 3.9, 5, and 6 HP. It is a direct replacement for the water-pump impeller used in the engine cooling system and helps restore proper water circulation when the original impeller is worn, cracked, brittle, or damaged.\u003c\/p\u003e\n\u003cp\u003eThe impeller is supplied with a key and is identified as an aftermarket replacement for Mercury Marine part number \u003cstrong\u003e47-22748\u003c\/strong\u003e. The aftermarket reference associated with this product is \u003cstrong\u003e18-3012\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProduct Type: Water pump impeller with key\u003c\/li\u003e\n  \u003cli\u003eEngine Type: 2-stroke outboard\u003c\/li\u003e\n  \u003cli\u003eInstallation Method: Direct replacement\u003c\/li\u003e\n  \u003cli\u003eApplication: Mercury Mariner 3.5, 3.9, 5, and 6 HP engines\u003c\/li\u003e\n  \u003cli\u003eIncluded Components: One impeller and one key\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number References\u003c\/h2\u003e\n\u003cp\u003eUse the references below together with your engine model and original component dimensions to confirm the correct application.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number References\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eReference Type\u003c\/th\u003e\n        \u003cth\u003eBrand or Catalog\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\u003eOEM replacement reference\u003c\/td\u003e\n        \u003ctd\u003eMercury Marine\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAftermarket reference\u003c\/td\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3012\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\u003eThis product is listed for Mercury Mariner 2-stroke engines in the horsepower range shown below. Model names, production years, and serial-number ranges can vary by market and engine configuration, so compare the original impeller and verify the exact engine identification before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eEngine Rating\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eApplication Scope\u003c\/th\u003e\n        \u003cth\u003eReplacement Reference\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e3.5 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003eSelected engines\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n        \u003ctd\u003eConfirm the original impeller dimensions and key arrangement.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e3.9 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003eSelected engines\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n        \u003ctd\u003eConfirm the original impeller dimensions and key arrangement.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e5 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003eSelected engines\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n        \u003ctd\u003eConfirm the original impeller dimensions and key arrangement.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e6 HP\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003eSelected engines\u003c\/td\u003e\n        \u003ctd\u003e47-22748\u003c\/td\u003e\n        \u003ctd\u003eCatalog fitment depends on the exact model and serial-number range.\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\u003eWater pump impeller with key\u003c\/dd\u003e\n  \u003cdt\u003eReplacement Type\u003c\/dt\u003e\n  \u003cdd\u003eAftermarket direct replacement\u003c\/dd\u003e\n  \u003cdt\u003eEngine Type\u003c\/dt\u003e\n  \u003cdd\u003e2-stroke outboard\u003c\/dd\u003e\n  \u003cdt\u003eOutside Diameter\u003c\/dt\u003e\n  \u003cdd\u003e1.250 in (31.75 mm)\u003c\/dd\u003e\n  \u003cdt\u003eInside Diameter\u003c\/dt\u003e\n  \u003cdd\u003e0.456 in (approximately 11.58 mm)\u003c\/dd\u003e\n  \u003cdt\u003eKey\u003c\/dt\u003e\n  \u003cdd\u003eIncluded with the product\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eDirect fit when the engine application and dimensions match\u003c\/dd\u003e\n  \u003cdt\u003eIntended Environment\u003c\/dt\u003e\n  \u003cdd\u003eFor marine cooling-system service; always follow the engine manufacturer's maintenance and operating instructions.\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  \u003cli\u003e1 x Impeller key\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eStop the engine and follow all manufacturer safety procedures before beginning work.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit according to the service procedure for your specific Mercury Mariner engine.\u003c\/li\u003e\n  \u003cli\u003eRemove the water-pump housing and take out the old impeller and key.\u003c\/li\u003e\n  \u003cli\u003eInspect the housing, wear plate, water tube, seals, and related components for scoring, distortion, blockage, or damage. Replace damaged parts as required.\u003c\/li\u003e\n  \u003cli\u003eInstall the supplied key in the driveshaft keyway and fit the new impeller in the correct position.\u003c\/li\u003e\n  \u003cli\u003eReinstall the water-pump housing, ensuring that the impeller vanes are positioned correctly as the housing is fitted.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit and confirm that the driveshaft and water tube are properly aligned.\u003c\/li\u003e\n  \u003cli\u003eOperate the engine only in an appropriate test tank or body of water, and verify that cooling-water flow is present before normal use.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm that this impeller fits my engine?\u003c\/summary\u003e\u003cp\u003eVerify that your engine is a Mercury Mariner 2-stroke model in the 3.5, 3.9, 5, or 6 HP range. Then compare the original impeller's outside diameter, inside diameter, key arrangement, model identification, and serial-number range where applicable. Do not rely on horsepower alone.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water-pump impeller?\u003c\/summary\u003e\u003cp\u003eTypical signs include overheating, reduced cooling-water flow, an intermittent or weak telltale stream, or impeller vanes that are cracked, brittle, deformed, or missing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes the product include the key?\u003c\/summary\u003e\u003cp\u003eYes. The product is supplied as a water pump impeller with one key.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM Mercury part?\u003c\/summary\u003e\u003cp\u003eNo. This is an aftermarket replacement component intended to replace the Mercury Marine 47-22748 impeller when the application and dimensions match.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use this listing for a 4-stroke or 9.8 HP engine?\u003c\/summary\u003e\u003cp\u003eThe company application data specifies Mercury Mariner 2-stroke engines rated at 3.5, 3.9, 5, and 6 HP. A 4-stroke or 9.8 HP engine is not confirmed for this product by the supplied company record.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should an outboard impeller be replaced?\u003c\/summary\u003e\u003cp\u003eReplacement timing depends on the engine manufacturer's maintenance schedule, operating hours, water conditions, and the condition of the existing impeller. Inspect the impeller during scheduled cooling-system service and replace it if wear or damage is found.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirm the exact engine model, stroke, horsepower, serial-number range where applicable, and original impeller dimensions before purchasing.\u003c\/li\u003e\n  \u003cli\u003eDo not run an outboard without an adequate water supply for cooling.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component, not an original Mercury Marine part.\u003c\/li\u003e\n  \u003cli\u003eIf the original component differs in diameter, key arrangement, vane design, or overall profile, do not install this replacement.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when the water-pump assembly or lower unit 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 — We supply replacement components for routine marine maintenance and repair.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Product descriptions emphasize engine type, application scope, and reference numbers to support part selection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePractical Maintenance Support\u003c\/strong\u003e — Always compare the original component and follow the service procedure for your specific engine.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723963896123,"sku":"17IM002K","price":18.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_for_Mercury_39_6_98_HP_47-22748_-_JLM_MARINE-8288494.jpg?v=1763038521"}],"url":"https:\/\/seasierra.com\/collections\/mercury-2-stroke-3-5-9-8hp-outboard-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}