{"product_id":"water-pump-repair-kit-fits-mercury-mariner-9-9-25-hp-replaces-46-99157t2-46-85098a2","title":"Water Pump Repair Kit – Fits Mercury\/Mariner 9.9–25 HP (Replaces 46-99157T2, 46-85098A2)","description":"\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis \u003cstrong\u003eWater Pump Repair Kit – Fits Mercury\/Mariner 9.9–25 HP\u003c\/strong\u003e is engineered to service the upper water pump assembly on a range of Mercury and Mariner outboard engines. It provides a reliable solution for 2-Stroke models from 15–25 HP (1980–1998) and 4-Stroke models from 9.9–15 HP (1995–2006).\u003c\/p\u003e\n  \u003cp\u003eThis kit serves as a direct replacement for Mercury OEM part numbers 46-99157T2, 46-99157A2, 46-85098A2, 85098A2, 99157A2, and 99157T2.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eCompatible with upper water pump installations.\u003c\/li\u003e\n    \u003cli\u003eFeatures a durable SS316 stainless steel housing for corrosion resistance.\u003c\/li\u003e\n    \u003cli\u003eIncludes a high-performance neoprene marine rubber impeller.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket parts.\u003c\/p\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  \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\u003e46-99157T2\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e46-99157A2\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e46-85098A2\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e85098A2\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e99157A2\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e99157T2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\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\/Mariner owners, please verify your engine's serial number against the notes provided to ensure an exact match.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Mercury\/Mariner 2-Stroke 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\/Mariner\u003c\/td\u003e\n          \u003ctd\u003e15 XD Bigfoot\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\u003e46-99157T2\u003c\/td\u003e\n          \u003ctd\u003eSerial #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\u003e46-99157T2\u003c\/td\u003e\n          \u003ctd\u003eUSA Serial #5837437 \u0026amp; Up, AUS Serial #8071973 \u0026amp; Up, BEL Serial #9308306 \u0026amp; Up, CAN Serial #7209608 \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\u003e46-99157T2\u003c\/td\u003e\n          \u003ctd\u003eUSA Serial #6443973-0T800749, BEL Serial #9415101 \u0026amp; Up, CAN Serial #7209533 \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\u003e1980–1987\u003c\/td\u003e\n          \u003ctd\u003e46-99157T2\u003c\/td\u003e\n          \u003ctd\u003eUSA Serial #5705532 \u0026amp; Up, AUS Serial #8073158 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n          \u003ctd\u003e25 (3-Cylinder)\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\u003e46-99157T2\u003c\/td\u003e\n          \u003ctd\u003eSerial #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\/Marathon\/Super 15\u003c\/td\u003e\n          \u003ctd\u003e25\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1988–1994\u003c\/td\u003e\n          \u003ctd\u003e46-99157T2\u003c\/td\u003e\n          \u003ctd\u003eBEL Serial #9507381 \u0026amp; Up, CAN Serial #0A730007 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n          \u003ctd\u003e25 Sea Pro\/Marathon\/Super 15\u003c\/td\u003e\n          \u003ctd\u003e25\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1988–1998\u003c\/td\u003e\n          \u003ctd\u003e46-99157T2\u003c\/td\u003e\n          \u003ctd\u003eUSA Serial #0B238464 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Mercury\/Mariner 4-Stroke 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\/Mariner\u003c\/td\u003e\n          \u003ctd\u003e9.9 Bigfoot\u003c\/td\u003e\n          \u003ctd\u003e9.9\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1995–1998\u003c\/td\u003e\n          \u003ctd\u003e46-99157T2\u003c\/td\u003e\n          \u003ctd\u003eUSA Serial #0G760300-0T979999, BEL Serial #0P075166-0P325499\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n          \u003ctd\u003e15 Bigfoot\u003c\/td\u003e\n          \u003ctd\u003e15\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1998\u003c\/td\u003e\n          \u003ctd\u003e46-99157T2\u003c\/td\u003e\n          \u003ctd\u003eUSA Serial #0G590000 \u0026amp; Up, BEL Serial #9973100 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\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\u003eUpper Water Pump\u003c\/dd\u003e\n    \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eStainless Steel (SS316)\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene Marine Rubber\u003c\/dd\u003e\n    \u003cdt\u003eGasket Material\u003c\/dt\u003e\n\u003cdd\u003eNon-asbestos\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Pump Housing Assembly (Replaces 99157A02, 99157A1)\u003c\/li\u003e\n    \u003cli\u003e1 x Impeller (Replaces 8508910, 47-85089-3, 47-85089-10)\u003c\/li\u003e\n    \u003cli\u003e1 x Face Plate (Replaces 85083)\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket (Replaces 993261)\u003c\/li\u003e\n    \u003cli\u003e1 x Key (Replaces 8M0032838)\u003c\/li\u003e\n    \u003cli\u003e1 x Seal (Replaces 85090001, 85090)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e Washer (transparent) (Replaces 12-86645-1)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e4 x\u003c\/span\u003e Insulator (Replaces 23-85095)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e3 x\u003c\/span\u003e O-ring\u003c\/li\u003e\n    \u003cli\u003e1 x Water Tube Guide Sleeve\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n      \u003cli\u003eDisconnect the battery and remove the engine cover.\u003c\/li\u003e\n      \u003cli\u003eDrain the gearcase oil from the lower unit.\u003c\/li\u003e\n      \u003cli\u003eRemove the bolts securing the lower unit (gearcase) to the engine's midsection and carefully lower it.\u003c\/li\u003e\n      \u003cli\u003eLocate the water pump housing on top of the gearcase. Remove its mounting bolts to expose the impeller and internal components.\u003c\/li\u003e\n      \u003cli\u003eRemove the old impeller, face plate, gaskets, and seals. Clean all surfaces thoroughly.\u003c\/li\u003e\n      \u003cli\u003eInstall the new gasket, face plate, and impeller from the kit. Ensure the impeller key is correctly seated on the driveshaft.\u003c\/li\u003e\n      \u003cli\u003eLubricate the inside of the housing and the new impeller with a marine-safe lubricant.\u003c\/li\u003e\n      \u003cli\u003eRe-install the water pump housing and tighten the bolts to the manufacturer's specified torque.\u003c\/li\u003e\n      \u003cli\u003eRe-attach the lower unit to the engine, ensuring the driveshaft and water tube are properly aligned.\u003c\/li\u003e\n      \u003cli\u003eRefill the gearcase with fresh oil, reconnect the battery, and test the engine in water to verify proper cooling.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I confirm this kit fits my specific engine?\u003c\/summary\u003e\n    \u003cp\u003eCheck the compatibility tables and verify your engine's model, horsepower, and year range. Most importantly, match your engine's serial number with the ranges listed in the 'Notes' column for a precise fit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are common signs of a failing water pump?\u003c\/summary\u003e\n    \u003cp\u003eThe most common sign is engine overheating at idle or low speeds. You may also notice a weak or inconsistent stream of water from the tell-tale outlet. Reduced engine performance can also indicate a cooling problem.\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 preventative maintenance measure, it's recommended to inspect the impeller annually and replace it every 1-2 years (or every 100-200 hours of use), depending on operating conditions. More frequent replacement may be needed in sandy or saltwater environments.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I install this repair kit myself?\u003c\/summary\u003e\n    \u003cp\u003eWhile DIY installation is possible for those with mechanical experience, professional installation is recommended to ensure safety and correct function. The process involves handling the lower unit, which can be heavy and requires careful alignment during reassembly.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eMy engine still overheats after replacing the kit. What could be the issue?\u003c\/summary\u003e\n    \u003cp\u003eIf overheating persists, check for other blockages in the cooling system, such as clogged intake screens, a faulty thermostat, or debris in the engine's internal water passages. Also, ensure the water tube was correctly aligned during installation.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an OEM part or an aftermarket one?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is for an aftermarket replacement, not an OEM component. It is built to meet or exceed OEM-level specifications using comparable high-quality materials and is manufactured in an ISO 9002 certified facility with batch inspections for quality assurance.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow fast is shipping and what are the costs?\u003c\/summary\u003e\n    \u003cp\u003eWe ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options and their costs will be presented at checkout.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n    \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal marine use. Should an issue arise, contact our support team with your order details. Returns of unused items in their original condition are accepted within our standard return window. Please see our full policy page or contact us for instructions.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n  \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify images and specifications against your original part before purchasing. If anything differs—even if your model appears compatible—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 strongly recommended for safety and optimal performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\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 arrival in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with manufacturers, we provide 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":50718270685499,"sku":"WX-1N8V-H5PI","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/WX-1N8V-H5PI.png?v=1762958715","url":"https:\/\/seasierra.com\/products\/water-pump-repair-kit-fits-mercury-mariner-9-9-25-hp-replaces-46-99157t2-46-85098a2","provider":"SeaSierra","version":"1.0","type":"link"}