{"product_id":"water-pump-impeller-repair-kit-fits-mercury-175-300-hp-450r-v6-v8-4-stroke-outboards-replaces-47-8m0142980-8m0205803","title":"Water Pump Impeller Repair Kit – Fits Mercury 175–300 HP \u0026 450R V6\/V8 4-Stroke Outboards (Replaces 47-8M0142980\/8M0205803)","description":"\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eWater Pump Impeller Repair Kit\u003c\/strong\u003e is designed for Mercury Marine 4-stroke outboards, including 175–300 HP V6 (3.4L) and V8 (4.6L) models, plus 450R racing engines (2019 and newer, S\/N 2B529482+). It provides everything needed for a complete water pump service to maintain engine cooling and prevent overheating.\u003c\/p\u003e\n\u003cp\u003eThis kit is a direct interchange for Mercury part numbers 47-8M0142980, 8M0205803, and 98-8M0142980.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEngineered as a direct-fit replacement for straightforward installation.\u003c\/li\u003e\n\u003cli\u003eFeatures a high-performance neoprene rubber impeller for flexibility and durability.\u003c\/li\u003e\n\u003cli\u003eIncludes all necessary gaskets, seals, and hardware for a full repair.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-8M0142980\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e8M0205803\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e98-8M0142980\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eFor Mercury Marine outboards, this kit fits select V6 (3.4L) and V8 (4.6L) models from 2019 and newer with serial numbers 2B529482 and above.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eV6 Outboards\u003c\/td\u003e\n        \u003ctd\u003e175\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer (S\/N 2B529482+)\u003c\/td\u003e\n        \u003ctd\u003e47-8M0142980\/8M0205803\u003c\/td\u003e\n        \u003ctd\u003e3.4L displacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eV6 Outboards\u003c\/td\u003e\n        \u003ctd\u003e200\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer (S\/N 2B529482+)\u003c\/td\u003e\n        \u003ctd\u003e47-8M0142980\/8M0205803\u003c\/td\u003e\n        \u003ctd\u003e3.4L displacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eV6 Outboards\u003c\/td\u003e\n        \u003ctd\u003e225\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer (S\/N 2B529482+)\u003c\/td\u003e\n        \u003ctd\u003e47-8M0142980\/8M0205803\u003c\/td\u003e\n        \u003ctd\u003e3.4L displacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n        \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eV6 Outboards\u003c\/td\u003e\n        \u003ctd\u003e250\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer (S\/N 2B529482+)\u003c\/td\u003e\n        \u003ctd\u003e47-8M0142980\/8M0205803\u003c\/td\u003e\n        \u003ctd\u003e3.4L displacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eV8 Outboards\u003c\/td\u003e\n        \u003ctd\u003e250\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer (S\/N 2B529482+)\u003c\/td\u003e\n        \u003ctd\u003e47-8M0142980\/8M0205803\u003c\/td\u003e\n        \u003ctd\u003e4.6L displacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eV8 Outboards\u003c\/td\u003e\n        \u003ctd\u003e300\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer (S\/N 2B529482+)\u003c\/td\u003e\n        \u003ctd\u003e47-8M0142980\/8M0205803\u003c\/td\u003e\n        \u003ctd\u003e4.6L displacement\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eRacing 450R\u003c\/td\u003e\n        \u003ctd\u003e450\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer (S\/N 2B529482+)\u003c\/td\u003e\n        \u003ctd\u003e47-8M0142980\/8M0205803\u003c\/td\u003e\n        \u003ctd\u003e4.6L displacement\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 Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eHigh-performance neoprene rubber impeller with marine-grade corrosion resistant metal components\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 Year (for aftermarket versions)\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eDesigned for improved flexibility across broad temperature ranges; provides higher flow rates and cooling protection\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 (47-89984Q5\/47-89984T5\/47-89984T6)\u003c\/li\u003e\n  \u003cli\u003e1 x Drive Key\u003c\/li\u003e\n  \u003cli\u003e1 x Gasket\u003c\/li\u003e\n  \u003cli\u003e1 x Wear Plate\u003c\/li\u003e\n  \u003cli\u003e1 x O-ring\u003c\/li\u003e\n  \u003cli\u003e1 x Face Seal\u003c\/li\u003e\n  \u003cli\u003e1 x Drain Plug Seal\u003c\/li\u003e\n  \u003cli\u003e1 x Water Pump Gasket\u003c\/li\u003e\n  \u003cli\u003e1 x Actuator Seal\u003c\/li\u003e\n  \u003cli\u003e1 x Face Seal Tool\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the negative battery cable to prevent accidental starting.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit (gearcase) from the outboard motor. Refer to your service manual for specific bolt locations.\u003c\/li\u003e\n  \u003cli\u003eUnbolt and remove the water pump housing to access the impeller.\u003c\/li\u003e\n  \u003cli\u003eTake note of the old impeller's vane direction before removing it, along with the old gaskets, seals, and wear plate.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean all mating surfaces, removing any old gasket material or corrosion.\u003c\/li\u003e\n  \u003cli\u003eInstall the new wear plate, gaskets, and seals from the kit. Lightly grease the new impeller and slide it into the housing while turning the driveshaft clockwise to seat the vanes correctly.\u003c\/li\u003e\n  \u003cli\u003eReinstall the water pump housing, ensuring all bolts are torqued to the manufacturer's specification.\u003c\/li\u003e\n  \u003cli\u003eReattach the lower unit to the outboard and reconnect the battery cable. Start the engine and verify a steady stream of water from the tell-tale outlet.\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 kit fits my Mercury outboard?\u003c\/summary\u003e\n  \u003cp\u003eThis kit is specifically for Mercury V6 (3.4L) and V8 (4.6L) 4-stroke outboards (175–450 HP) manufactured in 2019 or later with a serial number of 2B529482 or higher. Always confirm your engine's model, year, and serial number before purchasing.\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 symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the \"telltale\" outlet, or a melted water pump housing. Upon inspection, a worn impeller will have cracked, brittle, or permanently bent vanes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should I replace my water pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eFor preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1 to 2 years (or every 100-200 hours of operation). More frequent replacement may be necessary if you operate in saltwater or sandy\/silty conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n  \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723787768123,"sku":"wp6lluA9i8t","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/wp6lluA9i8t.png?v=1763031774","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-repair-kit-fits-mercury-175-300-hp-450r-v6-v8-4-stroke-outboards-replaces-47-8m0142980-8m0205803","provider":"SeaSierra","version":"1.0","type":"link"}