{"product_id":"water-pump-repair-kit-fits-mercury-mariner-outboards-30-70-hp-replaces-77177a3","title":"Water Pump Repair Kit – Fits Mercury \u0026 Mariner Outboards 30-70 HP (Replaces 77177A3)","description":"\u003csection\u003e\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\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\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis comprehensive \u003cstrong\u003eWater Pump Repair Kit\u003c\/strong\u003e is designed for Mercury and Mariner 2-cycle outboards from 30 HP through 70 HP (1977–1997). It includes all the essential components for a complete water pump overhaul, ensuring your engine remains properly cooled.\u003c\/p\u003e\n\u003cp\u003eThis kit directly replaces Mercury part number 46-77177A3 and is interchangeable with Sierra 18-3324, GLM 12100, and Mallory 9-48312.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstallation requires removal of the lower unit (gearcase).\u003c\/li\u003e\n\u003cli\u003eKit includes a new impeller, housing, face plate, gaskets, and seals.\u003c\/li\u003e\n\u003cli\u003eHousing components are constructed from durable plastic and metal.\u003c\/li\u003e\n\u003c\/ul\u003e\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\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\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 \u0026amp; Mariner models, verify your engine's HP, cylinder count, and serial number range (if 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\/Mariner\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\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinders (USA 0C159200-0G589999)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\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\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e2 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\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\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e2 cylinders (USA 4860103 \u0026amp; below, BEL 9184451 \u0026amp; below)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989–Up\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–Up\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\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\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinders (USA 5531630 \u0026amp; above)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\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\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e3 cylinders (USA 6428681-0D000749)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\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\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e3 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1976\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e3 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\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\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e3 cylinders (USA 4977157-6428680)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\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\u003eRequires lower unit removal\u003c\/dd\u003e\n\u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003ePlastic and metal\u003c\/dd\u003e\n\u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e108mm × 102mm × 95mm (4.25\" × 4.00\" × 3.75\")\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\u003e1 year (varies by manufacturer)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eWater Pump Impeller (89983T)\u003c\/li\u003e\n\u003cli\u003eUpper Housing\u003c\/li\u003e\n\u003cli\u003eLower Housing\u003c\/li\u003e\n\u003cli\u003eFace Plate\u003c\/li\u003e\n\u003cli\u003eFace Seal\u003c\/li\u003e\n\u003cli\u003eSeal Carrier\u003c\/li\u003e\n\u003cli\u003eWater Tube Coupling\u003c\/li\u003e\n\u003cli\u003eDrive Key\u003c\/li\u003e\n\u003cli\u003eMultiple gaskets \u003cspan style=\"color:#d0021b;\"\u003e(quantity varies by manufacturer)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect the battery and shift the outboard into neutral.\u003c\/li\u003e\n\u003cli\u003eRemove the propeller and drain the gearcase oil.\u003c\/li\u003e\n\u003cli\u003eUnbolt and carefully lower the gearcase (lower unit) from the driveshaft housing.\u003c\/li\u003e\n\u003cli\u003eRemove the old water pump housing, impeller, and all associated gaskets and seals.\u003c\/li\u003e\n\u003cli\u003eClean all mating surfaces thoroughly, ensuring they are free of old gasket material and corrosion.\u003c\/li\u003e\n\u003cli\u003eInstall the new components in the reverse order of removal, following an OEM service manual for guidance.\u003c\/li\u003e\n\u003cli\u003eLightly grease the new impeller and interior of the housing with marine-grade grease before assembly.\u003c\/li\u003e\n\u003cli\u003eTorque all bolts to the manufacturer's specified values.\u003c\/li\u003e\n\u003cli\u003eReinstall the gearcase, refill with fresh gear lube, and reinstall the propeller.\u003c\/li\u003e\n\u003cli\u003eReconnect the battery and test the engine in water, confirming a steady stream of water from the tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if this kit fits my engine?\u003c\/summary\u003e\u003cp\u003eThis kit fits specific Mercury and Mariner 2-stroke outboards from 30–70 HP, manufactured between 1977 and 1997. Always check your engine's model, year, and serial number against our compatibility table. When in doubt, compare the parts in our photos to your old ones.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhen should I replace my water pump kit?\u003c\/summary\u003e\u003cp\u003eFor preventative maintenance, we recommend inspecting your impeller annually and replacing the entire water pump kit every 2–3 years or 200–300 hours, whichever comes first. In saltwater or sandy conditions, more frequent replacement is advised.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water pump?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include a weak or intermittent water stream from the \"tell-tale\" outlet, engine overheating alarms, and in severe cases, steam from the exhaust. A dry-rotted, cracked, or brittle impeller is a clear sign it needs immediate replacement.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs special knowledge needed to install this kit?\u003c\/summary\u003e\u003cp\u003eYes, installation requires removing the lower unit (gearcase), which can be complex. We strongly recommend professional installation unless you are experienced with outboard motor repair and have the appropriate tools and a service manual.\u003c\/p\u003e\u003c\/details\u003e\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\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\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\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\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\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723966550331,"sku":"24KM023","price":51.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Mercury_Mariner_-_BRP_Johnson_-_Evinrude_18-3324_-_JLM_MARINE-8290082.jpg?v=1763038636","url":"https:\/\/seasierra.com\/products\/water-pump-repair-kit-fits-mercury-mariner-outboards-30-70-hp-replaces-77177a3","provider":"SeaSierra","version":"1.0","type":"link"}