{"product_id":"water-pump-repair-kit-fits-mercury-mariner-2-cycle-30-70-hp-outboards-replaces-mercury-mariner-77177a3","title":"Water Pump Repair Kit – Fits Mercury\/Mariner 2-Cycle 30-70 HP Outboards (Replaces Mercury\/Mariner 77177A3)","description":"\u003csection\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-Cycle 30-70 HP Outboards (Replaces 77177A3)\u003c\/strong\u003e is a complete assembly designed to restore the cooling system on Mercury and Mariner 2-cycle outboards from 30 HP to 70 HP, generally covering models from 1977 to 1997. It ensures your engine maintains optimal temperature, preventing overheating and potential damage.\u003c\/p\u003e\n\u003cp\u003eThis kit provides a direct interchange for OEM part numbers Mercury\/Mariner 77177A3 and 46-77177A3, as well as aftermarket references Sierra 18-3324, GLM 12100, and Tutoroto 77177A3.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Engineered for direct replacement of the original housing and components.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEngine Compatibility:\u003c\/strong\u003e Specifically for 2-cycle gasoline outboard engines.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Includes the impeller, upper and lower housings, gaskets, and all necessary seals and keys for a comprehensive 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.\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\/Mariner\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\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\u003eTutoroto\u003c\/td\u003e\n\u003ctd\u003e77177A3\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\u003eCompatibility for Mercury and Mariner outboards is detailed below. For many models, checking your engine's serial number against the listed ranges is crucial for ensuring a precise fit.\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 \/ Serial Number\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\u003eOutboard\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1977–1997\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eOutboard\u003c\/td\u003e\n\u003ctd\u003e35\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eUSA 6445653+, BEL 9384476+, CAN 7209608+\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eOutboard\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eAll 2-cylinder engines through 1983\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eOutboard\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e4-cylinder (USA 0C159200+, BEL 9570790+)\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eOutboard\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e4-cylinder engines\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eOutboard\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e4-cylinder with plastic water pumps\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eOutboard\u003c\/td\u003e\n\u003ctd\u003e50–60\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e3-cylinder (USA 6428681–0D000749, BEL 9385911–9683054, CAN 7208333+)\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eOutboard\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e3-cylinder (USA 4977157–6428680, AUS 8050200+, BEL 9196961–9385910, CAN 7110998–7208332)\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e30 JET\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eUSA 0C159200–0G589999\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e\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\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eGasoline (2-Cycle)\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eRubber\/Metal components\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eVaries by manufacturer (Lifetime warranty on aftermarket kits)\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eComplete kit including impeller, upper and lower housings, face plate, gaskets, drive key, face seal, seal carrier, and water tube coupling\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 \u003cspan style=\"color:#d0021b;\"\u003eWater Pump Impeller\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003cli\u003e1 x \u003cspan style=\"color:#d0021b;\"\u003eUpper Housing\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003cli\u003e1 x \u003cspan style.=\"color:#d0021b;\"\u003eLower Housing\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003cli\u003e1 x Face Plate\u003c\/li\u003e\n  \u003cli\u003e1 x Face Seal\u003c\/li\u003e\n  \u003cli\u003e1 x Seal Carrier\u003c\/li\u003e\n  \u003cli\u003e1 x Water Tube Coupling\u003c\/li\u003e\n  \u003cli\u003e1 x Drive Key\u003c\/li\u003e\n  \u003cli\u003eMultiple x Gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eSafety first: Disconnect the battery and spark plug wires before beginning work.\u003c\/li\u003e\n  \u003cli\u003ePlace a drain pan under the lower unit and remove the gearcase drain and vent screws to empty the lubricant.\u003c\/li\u003e\n  \u003cli\u003eRemove the bolts securing the lower unit (gearcase) to the outboard's leg and carefully lower it.\u003c\/li\u003e\n  \u003cli\u003eUnbolt and detach the old water pump housing assembly from the gearcase.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean the driveshaft and all mating surfaces to remove old gasket material and corrosion.\u003c\/li\u003e\n  \u003cli\u003eSlide the new impeller key into the driveshaft and install the new impeller, ensuring the vanes are oriented correctly (typically clockwise).\u003c\/li\u003e\n  \u003cli\u003eAssemble the new housings, gaskets, and seals according to your service manual's diagram. Lightly grease components as specified.\u003c\/li\u003e\n  \u003cli\u003eRe-install the complete water pump assembly onto the gearcase and torque bolts to manufacturer specifications.\u003c\/li\u003e\n  \u003cli\u003eGuide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Secure with mounting bolts.\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 and spark plugs. Test the engine in water, confirming a steady stream from the tell-tale 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 this water pump kit will fit my engine?\u003c\/summary\u003e\n  \u003cp\u003eThe most reliable method is to match your engine's model, horsepower, and serial number to the ranges provided in the \"Engine \u0026amp; Model Compatibility\" table. Serial number is often the key to confirming the correct part, especially for models spanning many years.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing water pump?\u003c\/summary\u003e\n  \u003cp\u003eKey indicators include a weak or nonexistent water stream from the tell-tale port, frequent engine overheating alarms, and a noticeable drop in engine performance. Upon inspection, you might find the old impeller is cracked, brittle, or has broken vanes.\u003c\/p\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should the water pump be serviced?\u003c\/summary\u003e\n  \u003cp\u003eAs a best practice for preventative maintenance, inspect the impeller annually and plan to replace the entire water pump kit every 1-2 years or 100-200 hours of operation. Service intervals should be shorter for engines used in saltwater or silty\/sandy conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhy is a complete kit with housing recommended over just an impeller?\u003c\/summary\u003e\n  \u003cp\u003eA complete kit is recommended because the housing, wear plate, and seals can become worn or warped by heat and debris over time. Replacing only the impeller in a worn housing can lead to poor sealing and inefficient water pressure, failing to solve the overheating issue. This kit ensures all critical components are restored.\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 has been built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 facility and are 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 time is 5–15 days. Standard shipping is free, and expedited options will appear at checkout if they are 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. Should any issues arise, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in original condition. See our full 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 ordering. 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 highly recommended for safety, proper function, 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 rigoriously tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Enjoy free standard delivery to most regions, with parts typically arriving in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with manufacturers, we offer fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/details\u003e\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723964682555,"sku":"DJ-HPJE-1UD7","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/DJ-HPJE-1UD7.png?v=1763038555","url":"https:\/\/seasierra.com\/products\/water-pump-repair-kit-fits-mercury-mariner-2-cycle-30-70-hp-outboards-replaces-mercury-mariner-77177a3","provider":"SeaSierra","version":"1.0","type":"link"}