{"product_id":"water-pump-impeller-kit-fits-mercruiser-alpha-one-gen-ii-replaces-47-43026q06-47-8m0100526","title":"Water Pump Impeller Kit – Fits MerCruiser Alpha One Gen II (Replaces 47-43026Q06, 47-8M0100526)","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 Impeller Kit\u003c\/strong\u003e is designed for MerCruiser Alpha One Gen II sterndrives manufactured from 1991 onwards (serial numbers D469859 and above). It serves as a complete replacement solution to restore your engine's cooling system performance, preventing overheating and ensuring reliability on the water. This kit is also compatible with a range of Mercury Bigfoot and standard outboard engines.\u003c\/p\u003e\n\u003cp\u003eIt directly replaces MerCruiser part numbers 47-43026Q06 and 47-8M0100526, as well as Sierra 18-3214 and Quicksilver equivalents, providing a reliable aftermarket alternative.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstalls in the lower unit of the sterndrive or outboard.\u003c\/li\u003e\n  \u003cli\u003eIncludes the impeller, housing plate, seals, and gaskets for a comprehensive service.\u003c\/li\u003e\n  \u003cli\u003eEngineered to meet or exceed original equipment specifications for fit and function.\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\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e47-43026Q06\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e47-8M0100526\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eQuicksilver\u003c\/td\u003e\n        \u003ctd\u003e47-43026Q06\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eQuicksilver\u003c\/td\u003e\n        \u003ctd\u003e47-8M0100526\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3214\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 MerCruiser applications, this kit is specifically for Alpha One Gen II sterndrives with serial numbers D469859 and above.\u003c\/p\u003e\n\u003cp\u003eThis impeller kit is also compatible with certain Mercury outboards as detailed 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\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eAlpha One Gen II\u003c\/td\u003e\n        \u003ctd\u003eN\/A\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1991 and newer\u003c\/td\u003e\n        \u003ctd\u003e47-43026Q06\/47-8M0100526\u003c\/td\u003e\n        \u003ctd\u003eFor stern drives with serial numbers D469859 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 Impeller Kit\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eLower Unit\/Sterndrive\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 Impeller\u003c\/li\u003e\n  \u003cli\u003e1 x Face Seal\u003c\/li\u003e\n  \u003cli\u003e1 x Face Seal Setting Tool\u003c\/li\u003e\n  \u003cli\u003e1 x O-Ring\u003c\/li\u003e\n  \u003cli\u003e1 x Water Pump Base Plate\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e Gaskets\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 propeller for safety.\u003c\/li\u003e\n    \u003cli\u003eDrain the gearcase lubricant from the lower unit.\u003c\/li\u003e\n    \u003cli\u003eUnbolt and carefully lower the sterndrive's lower unit to access the water pump assembly.\u003c\/li\u003e\n    \u003cli\u003eRemove the bolts securing the water pump housing cover and lift it off.\u003c\/li\u003e\n    \u003cli\u003eRemove the old impeller, gaskets, and wear plate, noting their orientation. Clean all mating surfaces thoroughly.\u003c\/li\u003e\n    \u003cli\u003eInstall the new base plate, gaskets, and impeller. Ensure the impeller vanes are turned in the correct direction (typically clockwise) while seating it.\u003c\/li\u003e\n    \u003cli\u003eInstall the new seals and O-rings as provided in the kit.\u003c\/li\u003e\n    \u003cli\u003eReinstall the water pump housing and torque its bolts to the manufacturer's specification.\u003c\/li\u003e\n    \u003cli\u003eRe-attach the lower unit, refill the gearcase with fresh lubricant, and reinstall the propeller.\u003c\/li\u003e\n    \u003cli\u003eStart the engine using a water supply (flushing muffs) and verify water is exiting the tell-tale port, indicating proper pump function.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm this kit fits my Alpha One Gen II?\u003c\/summary\u003e\n  \u003cp\u003eThe key is your sterndrive's serial number. This kit is for MerCruiser Alpha One Gen II drives with serial numbers D469859 and higher, which generally covers models from 1991 onwards. If your serial number is lower, you will require a different kit.\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 a weak or non-existent water stream from the \"tell-tale\" outlet, engine overheating alerts or a high temperature gauge reading, and in some cases, a rattling or grinding noise coming from the lower unit area where the pump is located.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should the impeller be replaced?\u003c\/summary\u003e\n  \u003cp\u003eAs a preventative maintenance item, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if the boat is operated frequently in sandy, silty, or saltwater environments.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this a single overmolded plate or a three-piece system?\u003c\/summary\u003e\n  \u003cp\u003eThis kit includes a separate base plate and two gaskets, forming a three-piece system (gasket\/plate\/gasket). This design is a direct replacement for the specified OEM part numbers.\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":50723794846011,"sku":"20KM003-H（R）","price":22.99,"currency_code":"USD","in_stock":true}],"url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-mercruiser-alpha-one-gen-ii-replaces-47-43026q06-47-8m0100526","provider":"SeaSierra","version":"1.0","type":"link"}