{"product_id":"water-pump-impeller-repair-kit-fits-mercury-mariner-30-70-hp-replaces-46-77177a3-77177a3","title":"Water Pump Impeller Repair Kit – Fits Mercury\/Mariner 30-70 HP (Replaces 46-77177A3, 77177A3)","description":"\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\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis is a complete \u003cstrong\u003eWater Pump Impeller Repair Kit – Fits Mercury\/Mariner 30-70 HP (Replaces 46-77177A3, 77177A3)\u003c\/strong\u003e, designed for various 2-stroke outboard engines from 1976–1997. The kit includes the impeller, housing, gaskets, and all necessary seals and hardware for a full service, ensuring your engine's cooling system functions reliably.\u003c\/p\u003e\n  \u003cp\u003eIt serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 46-77177A3\/77177A3, Sierra 18-3324, GLM 12100, Mallory 9-48312, and EMP 46-01115.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete Assembly:\u003c\/strong\u003e Includes the plastic housing, neoprene impeller, and all required gaskets, seals, and o-rings for a comprehensive overhaul.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstallation Location:\u003c\/strong\u003e Mounts in the lower unit (gearcase) of the outboard engine.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDurable Materials:\u003c\/strong\u003e Features a housing made from high-strength Nylon PA66 plastic and a flexible neoprene rubber impeller for longevity and performance.\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\u003e46-77177A3 \/ 77177A3\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-3324\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eGLM\u003c\/td\u003e\n          \u003ctd\u003e12100\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMallory\u003c\/td\u003e\n          \u003ctd\u003e9-48312\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eEMP\u003c\/td\u003e\n          \u003ctd\u003e46-01115\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\u003eThis kit is designed for a wide range of Mercury and Mariner 2-stroke outboards. Please verify your engine's serial number against the ranges provided to ensure an exact match.\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\u003eJET (3CYL)\u003c\/td\u003e\n          \u003ctd\u003e30\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1989–1997\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003eSerial Range: 0C159200-0G589999, 9570790 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n          \u003ctd\u003eVarious\u003c\/td\u003e\n          \u003ctd\u003e35\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1984–1989\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003e2 cylinders, Serial Range: 6445653 \u0026amp; Up, 209608 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n          \u003ctd\u003eVarious\u003c\/td\u003e\n          \u003ctd\u003e40\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1978–1983\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003e2 cylinders, Serial Range: 5556230 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003eVarious\u003c\/td\u003e\n          \u003ctd\u003e40\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1989 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003e4 cylinders, Serial Range: 0C159200 \u0026amp; Up, 9570790 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003eVarious\u003c\/td\u003e\n          \u003ctd\u003e45\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1986 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003e4 cylinders, Serial Range: 5531630 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003eVarious\u003c\/td\u003e\n          \u003ctd\u003e50\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1978–1985\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003e4 cylinders, Serial Range: 4962056 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003eVarious\u003c\/td\u003e\n          \u003ctd\u003e50\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1984–1990\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003e3 cylinders, Serial Range: 6428681-0D000749, 0A721308 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003eVarious\u003c\/td\u003e\n          \u003ctd\u003e60\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1984–1990\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003e3 cylinders, Serial Range: 6428681-0D000749, 0A721308 \u0026amp; Up\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003eVarious\u003c\/td\u003e\n          \u003ctd\u003e65\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1976\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003e3 cylinders, Serial Range: 4382057-4571651\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003eVarious\u003c\/td\u003e\n          \u003ctd\u003e70\u003c\/td\u003e\n          \u003ctd\u003e2-Stroke\u003c\/td\u003e\n          \u003ctd\u003e1977–1983\u003c\/td\u003e\n          \u003ctd\u003e46-77177A3\u003c\/td\u003e\n          \u003ctd\u003e3 cylinders, Serial Range: 4977157-0B110053, 5579017-6428680\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 with Housing\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eLower Unit\/Gearcase\u003c\/dd\u003e\n    \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eNylon PA66 Plastic\u003c\/dd\u003e\n    \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n    \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene Rubber\u003c\/dd\u003e\n    \u003cdt\u003ePackage Dimensions\u003c\/dt\u003e\n\u003cdd\u003e156 × 102 × 53 mm (6.14 × 4.02 × 2.09 inches)\u003c\/dd\u003e\n    \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.22 kg (7.8 oz)\u003c\/dd\u003e\n    \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eVehicle Specific Fit\u003c\/dd\u003e\n    \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eLifetime (from some aftermarket suppliers)\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Water Pump Housing (77822A1)\u003c\/span\u003e\u003c\/li\u003e\n    \u003cli\u003e1 x Insert (48753)\u003c\/li\u003e\n    \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Impeller (89983T)\u003c\/span\u003e\u003c\/li\u003e\n    \u003cli\u003e1 x Upper Water Pump Gasket (19551)\u003c\/li\u003e\n    \u003cli\u003e1 x Lower Water Pump Gasket (19553)\u003c\/li\u003e\n    \u003cli\u003e1 x Face Plate (32768)\u003c\/li\u003e\n    \u003cli\u003e2 x Gasket (19552)\u003c\/li\u003e\n    \u003cli\u003e1 x O-Ring (25-26722)\u003c\/li\u003e\n    \u003cli\u003e2 x Drain Plug Seal (26-830749)\u003c\/li\u003e\n    \u003cli\u003e2 x O-Ring (805726)\u003c\/li\u003e\n    \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Key (8M0032837)\u003c\/span\u003e\u003c\/li\u003e\n    \u003cli\u003e1 x Rubber (25-20273)\u003c\/li\u003e\n    \u003cli\u003e1 x Shift Bracket Seal (37721001)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eDisconnect the battery's negative terminal before beginning work.\u003c\/li\u003e\n    \u003cli\u003ePlace a drain pan under the gearcase and remove the drain\/fill screws to empty the gear oil.\u003c\/li\u003e\n    \u003cli\u003eRemove the bolts securing the lower unit (gearcase) to the engine and carefully lower it.\u003c\/li\u003e\n    \u003cli\u003eUnbolt and remove the old water pump housing assembly from the driveshaft.\u003c\/li\u003e\n    \u003cli\u003eThoroughly clean the mating surfaces where the new gaskets will sit.\u003c\/li\u003e\n    \u003cli\u003eAssemble the new kit: install the key, new impeller (twist in the direction of engine rotation), face plate, and gaskets onto the driveshaft.\u003c\/li\u003e\n    \u003cli\u003eSlide the new water pump housing over the impeller assembly and secure it with the bolts.\u003c\/li\u003e\n    \u003cli\u003eCarefully guide the driveshaft and water tube into position while reinstalling the lower unit.\u003c\/li\u003e\n    \u003cli\u003eRefill the gearcase with the correct type and amount of marine gear lubricant.\u003c\/li\u003e\n    \u003cli\u003eReconnect the battery. Start the engine using a water supply (flushing muffs) and verify a strong, steady stream from the \"tell-tale\" water 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 my water pump needs replacing?\u003c\/summary\u003e\n    \u003cp\u003eCommon signs of a failing water pump include the engine overheating at idle or low speeds, a weak or non-existent water stream from the \"tell-tale\" outlet, or an impeller that is found to be brittle, cracked, or has missing vanes during a routine inspection.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the recommended replacement interval?\u003c\/summary\u003e\n    \u003cp\u003eFor optimal reliability and engine protection, it is recommended to inspect the impeller annually and replace the entire water pump kit every 2-3 years or 200-300 hours of operation. This interval should be shortened if the engine is operated frequently in sandy, silty, or saltwater conditions.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eMy old pump housing is metal. Why is this one plastic?\u003c\/summary\u003e\n    \u003cp\u003eModern aftermarket housings are often made from high-strength, corrosion-proof materials like Nylon PA66 plastic. These materials are engineered to meet or exceed the durability and performance standards of older metal housings, especially in saltwater environments where corrosion is a concern.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy is a complete kit better than just replacing the impeller?\u003c\/summary\u003e\n    \u003cp\u003eA complete kit is recommended because other components, such as the housing, wear plate, and seals, also degrade over time. A worn housing or bad seals can cause pressure loss and reduce cooling efficiency, even with a new impeller. Replacing the full assembly ensures all components are fresh for maximum reliability.\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":50723965108539,"sku":"21KM009R-2","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/21KM009R-2.png?v=1763038569","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-repair-kit-fits-mercury-mariner-30-70-hp-replaces-46-77177a3-77177a3","provider":"SeaSierra","version":"1.0","type":"link"}