{"product_id":"water-pump-repair-kit-fits-mercury-175-300hp-450r-v6-v8-4-stroke-outboards-replaces-8m0205803-8m0142980","title":"Water Pump Repair Kit – Fits Mercury 175-300HP \u0026 450R V6\/V8 4-Stroke Outboards (Replaces 8M0205803, 8M0142980)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\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\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eWater Pump Repair Kit\u003c\/strong\u003e is designed for Mercury Marine 175-300HP 3.4L V6 and 4.6L V8 4-stroke outboards, including 450R models, from 2019 and newer (serial number 2B529482 and above).\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Mercury part numbers 8M0205803, 8M0142980, 47-8M0205803, and 98-8M0142980.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEngineered for direct-fit installation.\u003c\/li\u003e\n\u003cli\u003eComplete kit includes all necessary gaskets, seals, and a new impeller.\u003c\/li\u003e\n\u003cli\u003eRestores cooling system performance to prevent engine overheating.\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\u003e8M0205803\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e8M0142980\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-8M0205803\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\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\u003e3.4L V6\u003c\/td\u003e\n        \u003ctd\u003e175\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer\u003c\/td\u003e\n        \u003ctd\u003e8M0205803\u003c\/td\u003e\n        \u003ctd\u003eSerial no. 2B529482 and above\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e3.4L V6\u003c\/td\u003e\n        \u003ctd\u003e200\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer\u003c\/td\u003e\n        \u003ctd\u003e8M0205803\u003c\/td\u003e\n        \u003ctd\u003eSerial no. 2B529482 and above\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e3.4L V6\u003c\/td\u003e\n        \u003ctd\u003e225\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer\u003c\/td\u003e\n        \u003ctd\u003e8M0205803\u003c\/td\u003e\n        \u003ctd\u003eSerial no. 2B529482 and above\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e4.6L V8\u003c\/td\u003e\n        \u003ctd\u003e200\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer\u003c\/td\u003e\n        \u003ctd\u003e8M0205803\u003c\/td\u003e\n        \u003ctd\u003eSerial no. 2B529482 and above\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e4.6L V8\u003c\/td\u003e\n        \u003ctd\u003e225\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer\u003c\/td\u003e\n        \u003ctd\u003e8M0205803\u003c\/td\u003e\n        \u003ctd\u003eSerial no. 2B529482 and above\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e4.6L V8\u003c\/td\u003e\n        \u003ctd\u003e250\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer\u003c\/td\u003e\n        \u003ctd\u003e8M0205803\u003c\/td\u003e\n        \u003ctd\u003eSerial no. 2B529482 and above\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e4.6L V8\u003c\/td\u003e\n        \u003ctd\u003e300\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer\u003c\/td\u003e\n        \u003ctd\u003e8M0205803\u003c\/td\u003e\n        \u003ctd\u003eSerial no. 2B529482 and above\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eRacing\u003c\/td\u003e\n        \u003ctd\u003e450R\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2019 and newer\u003c\/td\u003e\n        \u003ctd\u003e8M0205803\u003c\/td\u003e\n        \u003ctd\u003eSerial no. 2B529482 and above\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 Repair Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement\u003c\/dd\u003e\n  \u003cdt\u003eFitment Requirement\u003c\/dt\u003e\n\u003cdd\u003eFor Mercury V6\/V8 4-stroke outboards with serial number 2B529482 and above\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 Gasket (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x Face Plate (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x Face Plate Gasket (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x Impeller Key (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x Impeller (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x Face Seal (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x Drain Plug Seal (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x Water Pump Gasket (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x O-Ring (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x Actuator Seal (8M0205803)\u003c\/li\u003e\n  \u003cli\u003e1 x Face Seal Tool (8M0205803)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and remove the lower unit from the outboard motor.\u003c\/li\u003e\n  \u003cli\u003eRemove the old water pump housing, impeller, gaskets, and seals.\u003c\/li\u003e\n  \u003cli\u003eClean all mating surfaces thoroughly, ensuring they are free of old gasket material and corrosion.\u003c\/li\u003e\n  \u003cli\u003eInstall the new gaskets, face plate, impeller (with key), and seals from the kit.\u003c\/li\u003e\n  \u003cli\u003eLubricate the inside of the housing and the impeller with marine grease before assembling.\u003c\/li\u003e\n  \u003cli\u003eReinstall the water pump housing and torque bolts to manufacturer specifications.\u003c\/li\u003e\n  \u003cli\u003eReattach the lower unit to the outboard and test the engine in the water to verify proper cooling function.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if this kit fits my Mercury outboard?\u003c\/summary\u003e\u003cp\u003eThis kit is for Mercury 3.4L V6 and 4.6L V8 four-stroke outboards (175–450HP) made in 2019 or later, specifically with a serial number of 2B529482 and above. Always check your serial number before ordering.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water pump?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include the engine overheating at idle or low speeds, a weak or non-existent \"telltale\" water stream, or an audible alarm from the engine's warning system.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should the water pump impeller be replaced?\u003c\/summary\u003e\u003cp\u003eAs a preventative maintenance item, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this kit difficult to install?\u003c\/summary\u003e\u003cp\u003eInstallation requires basic mechanical skills and tools to drop the lower unit. If you are not comfortable with this process, we highly recommend professional installation to ensure proper function and avoid engine damage.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\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\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\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\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\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003eManufacturer-Direct Value — 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":50723787800891,"sku":"Z4-KVEB-D9Q6","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Z4-KVEB-D9Q6.png?v=1763031775","url":"https:\/\/seasierra.com\/products\/water-pump-repair-kit-fits-mercury-175-300hp-450r-v6-v8-4-stroke-outboards-replaces-8m0205803-8m0142980","provider":"SeaSierra","version":"1.0","type":"link"}