{"product_id":"water-pump-repair-kit-fits-mercury-mariner-2-stroke-15-25-hp-4-stroke-9-9-15-hp-replaces-47-85089t7-47-85089q4","title":"Water Pump Repair Kit – Fits Mercury\/Mariner 2-Stroke 15-25 HP \u0026 4-Stroke 9.9-15 HP (Replaces 47-85089T7, 47-85089Q4)","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 – Fits Mercury\/Mariner 2-Stroke 15-25 HP \u0026amp; 4-Stroke 9.9-15 HP\u003c\/strong\u003e is designed to restore the cooling system on a range of Mercury and Mariner outboards. It is compatible with 2-Stroke models from 15 HP to 25 HP (1980–1998), including Sea Pro and XD variants, and specific 4-Stroke BigFoot models from 9.9 HP to 15 HP (1998 and newer).\u003c\/p\u003e\n\u003cp\u003eThis kit serves as a direct interchange for Mercury part numbers 47-85089T7, 47-85089Q4, 47-85089T4, as well as aftermarket equivalents like Sierra 18-3215 and GLM 12107.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eEngineered for a direct OEM-replacement fit and simple installation.\u003c\/li\u003e\n    \u003cli\u003eBuilt with durable CR rubber and stainless steel components for reliable use in both salt and freshwater.\u003c\/li\u003e\n    \u003cli\u003eIncludes a new impeller, wear plate, gaskets, and all necessary seals for a complete water pump service.\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 suppliers.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference 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\u003e47-85089T7\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-85089Q4\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e47-85089T4\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3215\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e12107\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 and year in the tables below. Verifying serial numbers is crucial for ensuring proper fitment.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMercury\/Mariner 2-Stroke Engines:\u003c\/strong\u003e This kit is designed for various 15 HP to 25 HP models produced between 1980 and 1998. Please check your engine's serial number against the ranges listed below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Mercury\/Mariner 2-Stroke Engine 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\/Mariner\u003c\/td\u003e\n        \u003ctd\u003e15 XD\u003c\/td\u003e\n        \u003ctd\u003e15\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1997–1998\u003c\/td\u003e\n        \u003ctd\u003e47-85089T7\u003c\/td\u003e\n        \u003ctd\u003eBEL ser# 9927000 \u0026amp; Up\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n        \u003ctd\u003e18, 18XD\u003c\/td\u003e\n        \u003ctd\u003e18\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1980–1985\u003c\/td\u003e\n        \u003ctd\u003e47-85089T7\u003c\/td\u003e\n        \u003ctd\u003eUSA ser# 5837437 \u0026amp; Up\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n        \u003ctd\u003e20, 20XD\u003c\/td\u003e\n        \u003ctd\u003e20\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1986–1987\u003c\/td\u003e\n        \u003ctd\u003e47-85089T7\u003c\/td\u003e\n        \u003ctd\u003eUSA ser# 6443973-0T800749\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n        \u003ctd\u003e25, 25XD\u003c\/td\u003e\n        \u003ctd\u003e25\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1980–1987\u003c\/td\u003e\n        \u003ctd\u003e47-85089T7\u003c\/td\u003e\n        \u003ctd\u003eUSA ser# 5705532 \u0026amp; Up\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n        \u003ctd\u003e25, 25XD\u003c\/td\u003e\n        \u003ctd\u003e25\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1980–1983\u003c\/td\u003e\n        \u003ctd\u003e47-85089T7\u003c\/td\u003e\n        \u003ctd\u003eAUS ser# 8073158 \u0026amp; Up\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n        \u003ctd\u003e25 (3-Cyl.)\u003c\/td\u003e\n        \u003ctd\u003e25\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1997 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003e47-85089T7\u003c\/td\u003e\n        \u003ctd\u003eUSA ser# 0E268781 \u0026amp; Up\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n        \u003ctd\u003e25 Sea Pro, Super 15\u003c\/td\u003e\n        \u003ctd\u003e25, 15\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1988–1998\u003c\/td\u003e\n        \u003ctd\u003e47-85089T7\u003c\/td\u003e\n        \u003ctd\u003eUSA ser# 0B238464 \u0026amp; Up\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003eMercury\/Mariner 4-Stroke Engines:\u003c\/strong\u003e This kit fits specific 9.9 HP and 15 HP BigFoot models from 1998 onward. Check your serial number to ensure a correct match.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Mercury\/Mariner 4-Stroke Engine 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\/Mariner\u003c\/td\u003e\n        \u003ctd\u003eBigFoot (323cc)\u003c\/td\u003e\n        \u003ctd\u003e15\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1998\u003c\/td\u003e\n        \u003ctd\u003e47-85089T7\u003c\/td\u003e\n        \u003ctd\u003eUSA ser# 0G590000 \u0026amp; Up\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n        \u003ctd\u003eBigFoot (323cc)\u003c\/td\u003e\n        \u003ctd\u003e9.9\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1998+\u003c\/td\u003e\n        \u003ctd\u003e47-85089T7\u003c\/td\u003e\n        \u003ctd\u003eUSA ser# 0G760300-0T979999\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 OEM Replacement\u003c\/dd\u003e\n  \u003cdt\u003eMaterials\u003c\/dt\u003e\n\u003cdd\u003eCR Rubber (impeller), Stainless Steel (components)\u003c\/dd\u003e\n  \u003cdt\u003ePackage Dimensions\u003c\/dt\u003e\n\u003cdd\u003e6.57 × 5.98 × 1.34 inches (167 × 152 × 34 mm)\u003c\/dd\u003e\n  \u003cdt\u003ePackage Weight\u003c\/dt\u003e\n\u003cdd\u003e0.11 kg (0.24 lbs)\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eDesigned for salt and freshwater environments\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eLimited Lifetime (for Sierra branded version)\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 (Replaces 47-85089-10)\u003c\/li\u003e\n  \u003cli\u003e2 x Plastic Washer (Replaces 12-86645-1)\u003c\/li\u003e\n  \u003cli\u003e2 x Gasket (Replaces 27-99326)\u003c\/li\u003e\n  \u003cli\u003e1 x Key (Replaces 28-8M0032838)\u003c\/li\u003e\n  \u003cli\u003e1 x Wear Plate (Replaces 85083)\u003c\/li\u003e\n  \u003cli\u003e1 x O-Ring (Replaces 25-69202)\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. Remove the lower unit (gearcase) from the outboard motor.\u003c\/li\u003e\n  \u003cli\u003eCarefully disassemble the water pump housing, noting the order and orientation of all components.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean all mating surfaces and inspect the inside of the housing for scoring, warping, or corrosion.\u003c\/li\u003e\n  \u003cli\u003eInstall the new wear plate, gaskets, and seals provided in the kit.\u003c\/li\u003e\n  \u003cli\u003eLiberally lubricate the new impeller and the inside of the pump housing with silicone grease, marine-grade lubricant, or dish soap to prevent damage during initial startup.\u003c\/li\u003e\n  \u003cli\u003eSlide the new impeller onto the driveshaft, turning the shaft clockwise to help flex the vanes into the housing correctly.\u003c\/li\u003e\n  \u003cli\u003eReassemble the pump housing, tighten bolts to the manufacturer's specified torque, and reinstall the lower unit.\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 specific Mercury\/Mariner engine?\u003c\/summary\u003e\n  \u003cp\u003eThe most reliable way is to match your engine's model, year, and serial number to the ranges listed in the compatibility tables. Serial numbers are critical for ensuring an exact match, especially for engines made around transition years.\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 the engine overheating at idle or low speeds, a weak or non-existent stream of water from the \"telltale\" outlet, and in some cases, an engine alarm.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should the water pump impeller be replaced?\u003c\/summary\u003e\n  \u003cp\u003eAs a general maintenance guideline, inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use. Replacement frequency should be increased if operating in sandy, silty, or saltwater 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). It is built to OEM-level specifications with comparable materials. The component is manufactured in an ISO 9002 facility and is batch-inspected for quality and 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 is 5–15 days. Standard shipping is free, and expedited options will appear at checkout where available for your location.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\n  \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their 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 and specifications against your original part before purchase. If anything differs—even if your model appears on the compatibility list—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and to ensure optimal 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 rigorously tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions, with typical transit times of 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Our model provides fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718270619963,"sku":"O0-ILG7-8CVQ","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/O0-ILG7-8CVQ.png?v=1762958712","url":"https:\/\/seasierra.com\/products\/water-pump-repair-kit-fits-mercury-mariner-2-stroke-15-25-hp-4-stroke-9-9-15-hp-replaces-47-85089t7-47-85089q4","provider":"SeaSierra","version":"1.0","type":"link"}