{"product_id":"water-pump-impeller-repair-kit-fits-mercury-marine-30-jet-35-70-hp-outboards-replaces-46-77177a3-46-77516a3-46-73640a2","title":"Water Pump Impeller Repair Kit – Fits Mercury Marine 30 JET, 35-70 HP Outboards (Replaces 46-77177A3, 46-77516A3, 46-73640A2)","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 Repair Kit\u003c\/strong\u003e is designed for a range of 2-stroke Mercury Marine and Mariner outboard motors, including 30 JET, 35 HP, 40 HP, 45 HP, 50 HP, 60 HP, 65 HP, and 70 HP models manufactured between 1976 and 1997. It contains all necessary components to restore the engine’s cooling system, preventing overheating and ensuring reliable operation.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 46-77177A3, 46-77516A3, and 46-73640A2, as well as equivalents from Sierra, GLM, and Mallory.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eInstalls in the lower unit gearcase.\u003c\/li\u003e\n    \u003cli\u003eConstructed from marine-grade neoprene, nylon, and stainless steel for durability.\u003c\/li\u003e\n    \u003cli\u003eIncludes a complete set of gaskets, seals, and housings for a full rebuild.\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\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e46-77516A3\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e46-73640A2\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3322\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3323\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\u003e12170\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e12180\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\u003e9-48303\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-48302\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\u003eS\/N 0C159200 through 0G589999\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e(2 CYL.)\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\u003eS\/N 6445653 \u0026amp; Up\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e(2 CYL.)\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1978–1979\u003c\/td\u003e\n\u003ctd\u003e46-77177A3\u003c\/td\u003e\n\u003ctd\u003eS\/N 4860103 through 5556229\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e(2 CYL.)\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980–1983\u003c\/td\u003e\n\u003ctd\u003e46-77177A3\u003c\/td\u003e\n\u003ctd\u003eS\/N 5556230 through 6445653\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e(4 CYL.)\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\u003e46-77177A3\u003c\/td\u003e\n\u003ctd\u003eS\/N 0C159200 \u0026amp; Up\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e(4 CYL.)\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\u003e46-77177A3\u003c\/td\u003e\n\u003ctd\u003eS\/N 5531630 \u0026amp; Up\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e(4 CYL.)\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\u003eS\/N 4962056 \u0026amp; Up\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e(3 CYL.)\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\u003eS\/N 6428681 through 0D000749\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e(3 CYL.)\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\u003eS\/N 6428681 through 0D000749\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e650 (3 CYL.)\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\u003eS\/N 4382057 through 4571651\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e(3 CYL.)\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1979–1983\u003c\/td\u003e\n\u003ctd\u003e46-77177A3\u003c\/td\u003e\n\u003ctd\u003eS\/N 4977157 through 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\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eLower Unit Gearcase\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003eMarine Grade CR-Neoprene (Impeller and Seals), Nylon PA66 (Housing and Base), Stainless Steel 316 (Wear Plate)\u003c\/dd\u003e\n  \u003cdt\u003ePackage Dimensions\u003c\/dt\u003e\n\u003cdd\u003e15.7 × 10.3 × 8.2 cm (6.14 × 4.06 × 3.23 in)\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.35 kg (12.3 oz)\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eStandard 30-day return through retailers\u003c\/dd\u003e\n  \u003cdt\u003eOther Attributes\u003c\/dt\u003e\n\u003cdd\u003eComplete kit including 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 \u003cspan style=\"color:#d0021b;\"\u003eWater Pump Impeller (47-89983\/18-3007)\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003cli\u003e1 x \u003cspan style=\"color:#d0021b;\"\u003eUpper Pump Housing (46-77822A1\/18-3118)\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003cli\u003e1 x Water Pump Base (46-77177A1)\u003c\/li\u003e\n  \u003cli\u003e2 x Plates (27-32770, 27-19551)\u003c\/li\u003e\n  \u003cli\u003e2 x Drain Gaskets (12-20260, 12-19183)\u003c\/li\u003e\n  \u003cli\u003e1 x Drain Plug (12-49221)\u003c\/li\u003e\n  \u003cli\u003e3 x Water Pump Base Gaskets (27-32771, 27-77417, 27-19552)\u003c\/li\u003e\n  \u003cli\u003e3 x O-Rings (25-26855, 25-45711, 25-26722)\u003c\/li\u003e\n  \u003cli\u003e1 x Installation Instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n    \u003cli\u003eBefore starting, disconnect the battery and ensure the engine is securely mounted.\u003c\/li\u003e\n    \u003cli\u003eShift the outboard into neutral and remove the propeller.\u003c\/li\u003e\n    \u003cli\u003eUnbolt and carefully lower the gearcase from the driveshaft housing. Disconnect the shift shaft if necessary.\u003c\/li\u003e\n    \u003cli\u003eRemove the old water pump housing, impeller, and wear plate, noting the order of all parts.\u003c\/li\u003e\n    \u003cli\u003eClean all mating surfaces thoroughly, removing any old gasket material or debris.\u003c\/li\u003e\n    \u003cli\u003eInstall the new components from the kit in the reverse order of removal. Lightly grease the new impeller to ease installation.\u003c\/li\u003e\n    \u003cli\u003eReassemble the gearcase, ensuring all bolts are torqued to the manufacturer’s specifications.\u003c\/li\u003e\n    \u003cli\u003eRefer to your outboard's official service manual for detailed procedures and torque values.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow can I tell if this kit fits my specific motor?\u003c\/summary\u003e\n  \u003cp\u003eThe most reliable method is to match your engine's serial number (S\/N) to the ranges listed in the compatibility table. Also verify the model, horsepower, and year range. If in doubt, compare images to your existing parts before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are common signs of a failing impeller?\u003c\/summary\u003e\n  \u003cp\u003eThe primary symptom is engine overheating, often indicated by an alarm or temperature gauge. Other signs include a weak or inconsistent stream of water from the \"telltale\" outlet and, in severe cases, steam instead of water.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eMy outboard is Japanese-made. Are there special installation notes?\u003c\/summary\u003e\n  \u003cp\u003eYes. For some Japanese-manufactured Mariner outboards, you may need to retain and reuse the original housing grommet seal gasket, as the one supplied in the kit may not fit. For non-Japanese models, a separate grommet kit (part no. 26-38452\/26-38453) is recommended.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should a water pump impeller be replaced?\u003c\/summary\u003e\n  \u003cp\u003eAs a general maintenance guideline, inspect the impeller annually and plan for replacement every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can vary based on usage conditions (e.g., saltwater vs. freshwater, sandy\/silty water).\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM or aftermarket part?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). It has been built to meet or exceed OEM-level specifications with comparable high-quality materials. We ensure our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the shipping speed and cost?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free for most orders, with expedited options available at checkout where applicable.\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 use. Should an issue arise, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original packaging. See our policy page or reach out for detailed 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 purchase. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component, not an Original Equipment Manufacturer (OEM) part.\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 rigorously tested for real-world saltwater and freshwater 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 our manufacturing partners, we provide fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723965043003,"sku":"21KM009-QM","price":35.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/21KM009-QM.png?v=1763038566","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-repair-kit-fits-mercury-marine-30-jet-35-70-hp-outboards-replaces-46-77177a3-46-77516a3-46-73640a2","provider":"SeaSierra","version":"1.0","type":"link"}