{"product_id":"water-pump-impeller-kit-with-housing-fits-mercury-mariner-30-70-hp-replaces-46-77177a3-sierra-18-3324","title":"Water Pump Impeller Kit with Housing – Fits Mercury\/Mariner 30-70 HP (Replaces 46-77177A3, Sierra 18-3324)","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 with Housing\u003c\/strong\u003e is an essential service part for Mercury\/Mariner 2-stroke outboard engines ranging from 30 to 70 HP, covering models from 1977 to 1997.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 46-77177A3, Quicksilver 77177A3, Sierra 18-3324, GLM 12100, and Mallory 9-48312.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstallation: Direct-fit replacement for the original assembly.\u003c\/li\u003e\n\u003cli\u003eCore Components: Includes a neoprene rubber impeller, stainless steel wear plate, and a complete upper and lower pump housing.\u003c\/li\u003e\n\u003cli\u003eDurability: Designed with corrosion-resistant materials for reliable performance in marine environments.\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\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eQuicksilver\u003c\/td\u003e\n\u003ctd\u003e77177A3\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    \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\u003eJET\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\u003eUSA 0C159200-0G589999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e-\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 cylinder\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e-\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\u003eUSA 4860103 thru MY1983, AUS 8052125 \u0026amp; above, BEL 9184451 thru MY1983, CAN 7112423 \u0026amp; above\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989 and up\u003c\/td\u003e\n\u003ctd\u003e46-77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinder\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986 and up\u003c\/td\u003e\n\u003ctd\u003e46-77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinder\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e-\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 cylinder; USA 5531630 \u0026amp; above, AUS 8063985 \u0026amp; above, BEL 9248006 \u0026amp; above, CAN 7143688 \u0026amp; above\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e-\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 cylinder; USA 6428681-0D000749, BEL 9385911-9683054, CAN 7208333 \u0026amp; above\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e-\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 cylinder; USA 6428681-0D000749, BEL 9385911-9683054, CAN 7208333 \u0026amp; above\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e-\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 cylinder\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e-\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 cylinder; USA 4977157-6428680, AUS 8050200 \u0026amp; above, BEL 9196961-9385910, CAN 7110998-7208332\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMariner Magnum\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eUp to 1996\u003c\/td\u003e\n\u003ctd\u003e46-77177A3\u003c\/td\u003e\n\u003ctd\u003eVerified fit by customer review\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 with Housing\u003c\/dd\u003e\n\u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement\u003c\/dd\u003e\n\u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003eNeoprene rubber (impeller), stainless steel, plastic\u003c\/dd\u003e\n\u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003ePlastic, metal\u003c\/dd\u003e\n\u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e108 × 108 × 51 mm (4.25 × 4.25 × 2.0 in)\u003c\/dd\u003e\n\u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.34 kg (0.75 lb)\u003c\/dd\u003e\n\u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eLifetime (from some aftermarket suppliers)\u003c\/dd\u003e\n\u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eIncludes complete water pump assembly with upper and lower housings\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 Impeller\u003c\/li\u003e\n\u003cli\u003e1 x Impeller Plate\u003c\/li\u003e\n\u003cli\u003e1 x Impeller Key\u003c\/li\u003e\n\u003cli\u003e1 x Water Pump Housing\u003c\/li\u003e\n\u003cli\u003e1 x Water Pump Base\u003c\/li\u003e\n\u003cli\u003e1 x Water Pump Base Gasket\u003c\/li\u003e\n\u003cli\u003e1 x Lower Gasket\u003c\/li\u003e\n\u003cli\u003e1 x Upper Gasket\u003c\/li\u003e\n\u003cli\u003e1 x Drain Screw Gasket\u003c\/li\u003e\n\u003cli\u003e1 x Rubber Washer\u003c\/li\u003e\n\u003cli\u003e1 x O-Ring\u003c\/li\u003e\n\u003cli\u003e1 x Water Tube Coupling \u003cspan style=\"color:#d0021b;\"\u003e(included in some kits)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect the battery and uncouple the shift linkage.\u003c\/li\u003e\n\u003cli\u003eRemove the lower unit (gearcase) mounting bolts and carefully lower the unit from the outboard leg.\u003c\/li\u003e\n\u003cli\u003eUnbolt and remove the old water pump assembly from the top of the lower unit. Note the orientation of all parts.\u003c\/li\u003e\n\u003cli\u003eThoroughly clean the driveshaft and mating surfaces where the pump housing sits.\u003c\/li\u003e\n\u003cli\u003eInstall the new lower gasket, wear plate, and impeller key. Slide the new impeller onto the driveshaft, turning the shaft clockwise to bed the vanes.\u003c\/li\u003e\n\u003cli\u003eLightly lubricate the inside of the new housing and slide it down over the impeller.\u003c\/li\u003e\n\u003cli\u003eSecure the new housing with its bolts, tightening them to the manufacturer's recommended torque specification.\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit, carefully aligning the driveshaft, shift shaft, and water tube. Reconnect all linkages.\u003c\/li\u003e\n\u003cli\u003eOnce assembled, test the engine using a flush-muff or in the water to confirm a strong telltale stream and proper cooling.\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 specific engine model?\u003c\/summary\u003e\u003cp\u003eThis kit is designed for a wide range of Mercury and Mariner 2-stroke outboards from 30–70 HP (1977–1997). To confirm fitment, please consult the detailed Engine \u0026amp; Model Compatibility table on this page and verify your engine's model year or serial number range.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\u003cp\u003eCommon signs of a worn or damaged impeller include the engine overheating at idle or low speeds, a weak or non-existent stream of water from the \"telltale\" indicator, and a burnt rubber smell. Upon inspection, the old impeller may appear brittle, cracked, or have missing vanes.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should the water pump be serviced?\u003c\/summary\u003e\u003cp\u003eFor preventative maintenance, it is recommended to inspect and\/or replace the water pump impeller every 1-2 years or every 100-200 hours of operation. Service intervals may be shorter in saltwater or silty\/sandy conditions.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs the housing included in this kit?\u003c\/summary\u003e\u003cp\u003eYes, this is a complete water pump service kit that includes both the upper and lower housings, the impeller, a new wear plate, and all necessary gaskets, o-rings, and hardware for a full replacement.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eMy old part is stamped 46-77177A3. Is this the right kit?\u003c\/summary\u003e\u003cp\u003eYes, this kit is a direct aftermarket replacement for Mercury OEM part number 46-77177A3. It also cross-references with several other part numbers listed in our Part Number Matrix.\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":50723965075771,"sku":"655G8Dl5F9o","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/655G8Dl5F9o.png?v=1763038567","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-with-housing-fits-mercury-mariner-30-70-hp-replaces-46-77177a3-sierra-18-3324","provider":"SeaSierra","version":"1.0","type":"link"}