{"product_id":"water-pump-impeller-kit-fits-mercury-mariner-30-70-hp-replaces-46-77177a3-77177a3","title":"Water Pump Impeller Kit – Fits Mercury\/Mariner 30-70 HP (Replaces 46-77177A3, 77177A3)","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 complete \u003cstrong\u003eWater Pump Impeller Kit – Fits Mercury\/Mariner 2-Cycle 30-70 HP (Replaces 46-77177A3, 77177A3)\u003c\/strong\u003e provides everything needed to restore your engine's cooling system. It is designed for Mercury\/Mariner 2-Stroke outboards from 30 HP to 70 HP, covering models from 1976–1997, including 30 JET, 35, 40, 45, 50, 60, 65, and 70 HP variants.\u003c\/p\u003e\n\u003cp\u003eThis kit serves as a direct interchange for several part numbers, including Mercury 46-77177A3, Sierra 18-3324, GLM 12100, Mallory 9-48312, and Quicksilver 77177A3.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEngineered for direct OEM replacement installation.\u003c\/li\u003e\n\u003cli\u003eThe housing combines durable PA66 Nylon plastic for the upper section with a stainless steel cup and plate for corrosion resistance.\u003c\/li\u003e\n\u003cli\u003eIncludes a high-quality neoprene rubber impeller, gaskets, plates, and all necessary hardware for a full 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\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3 \/ 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\u003eSeaSierra\u003c\/td\u003e\n        \u003ctd\u003e183324\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\u003eNorthBoat\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\u003eThis kit is designed for a range of Mercury and Mariner 2-stroke outboard engines from 30 to 70 HP. Please check your serial number to ensure correct fitment, as specified in the notes.\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\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e30 JET\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 #9570790 \u0026amp; Up\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\u003e1984–1989\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003e2 Cylinder (S\/N 6445653 \u0026amp; Up)\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\u003e1978–1979\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003e2 Cylinder (S\/N 4860103-5556229)\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\u003e1980–1983\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003e2 Cylinder (S\/N 5556230-6445653)\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\u003e1989-Up\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003e4 Cylinder (S\/N 0C159200 \u0026amp; Up)\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\u003e1986-Up\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003e4 Cylinder (S\/N 5531630 \u0026amp; Up)\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\u003e1978–1985\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003e4 Cylinder (S\/N 4962056 \u0026amp; Up)\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\u003e1984–1990\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003e3 Cylinder (S\/N 6428681-0D000749)\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\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 (S\/N 6428681-0D000749)\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\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 (S\/N 4382057-4571651)\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\u003e1977–1983\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003e3 Cylinder (S\/N 4977157-6428680)\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 Kit with Housing\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM replacement\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003ePA66 Nylon Plastic (Upper Housing), Stainless Steel (Cup and Plate)\u003c\/dd\u003e\n  \u003cdt\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene Rubber\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e294 g (0.65 lb)\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eVaries by manufacturer (lifetime warranty from some aftermarket suppliers)\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eComplete kit including impeller, housing, base, plates, gaskets, and necessary hardware\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 Impeller (47-20268)\u003c\/li\u003e\n  \u003cli\u003e1 x Impeller Plate (32768)\u003c\/li\u003e\n  \u003cli\u003e1 x Impeller Key\u003c\/li\u003e\n  \u003cli\u003e1 x Water Pump Housing (46-48746A1)\u003c\/li\u003e\n  \u003cli\u003e1 x Water Pump Base (46-77177A1)\u003c\/li\u003e\n  \u003cli\u003e1 x Water Pump Base Gasket (27-32771)\u003c\/li\u003e\n  \u003cli\u003e1 x Water Pump Base Gasket (27-77417)\u003c\/li\u003e\n  \u003cli\u003e1 x Lower Water Pump Gasket (27-32769)\u003c\/li\u003e\n  \u003cli\u003e1 x Upper Water Pump Gasket (27-19551)\u003c\/li\u003e\n  \u003cli\u003e2 x Drain Screw Gasket (12-19183)\u003c\/li\u003e\n  \u003cli\u003e1 x Rubber Washer (12-49221)\u003c\/li\u003e\n  \u003cli\u003e3 x O-Ring\u003c\/li\u003e\n  \u003cli\u003e1 x Exhaust Leg Rubber Seal (37721) (Note: included in some kits)\u003c\/li\u003e\n\u003c\/ul\u003e\n\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 lower unit (gearcase) by unbolting it from the engine's midsection. Be prepared for it to be heavy.\u003c\/li\u003e\n  \u003cli\u003eLocate the water pump housing, typically on top of the lower unit, and remove the bolts securing it.\u003c\/li\u003e\n  \u003cli\u003eSlide the old housing and impeller off the driveshaft. Note the orientation of the impeller vanes.\u003c\/li\u003e\n  \u003cli\u003eClean the mounting surfaces and inspect the driveshaft for wear.\u003c\/li\u003e\n  \u003cli\u003eInstall the new gaskets, wear plate, and impeller key. Slide the new impeller onto the shaft, rotating it in the direction of engine rotation to bend the vanes correctly.\u003c\/li\u003e\n  \u003cli\u003eApply a light coat of marine grease to the inside of the new housing and install it over the impeller.\u003c\/li\u003e\n  \u003cli\u003eSecure the new housing with bolts, tightening them to the manufacturer's specified torque.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit, ensuring the driveshaft and water tube align correctly.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery and test the engine using a water supply (flushing muffs) to confirm a strong water stream from the tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if this kit fits my exact engine?\u003c\/summary\u003e\n  \u003cp\u003eThe best way to ensure fitment is to match your engine's model, horsepower, year, and serial number to the information in the Engine \u0026amp; Model Compatibility table. Serial number ranges are critical for many models.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the \"tell-tale\" outlet, and a dry, cracked, or deformed appearance of the old impeller upon inspection.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should I replace my water pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eFor preventative maintenance, it's recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. Consult your engine's service manual for specific intervals.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs there anything special about installing the new impeller?\u003c\/summary\u003e\n  \u003cp\u003eYes, ensure the impeller vanes are bent in the correct direction during installation. Lubricating the inside of the pump housing with marine grease helps the impeller seat correctly and prevents damage during the first startup.\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":50723964453179,"sku":"1U-6VYV-30E5","price":34.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/1U-6VYV-30E5.png?v=1763038546","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-mercury-mariner-30-70-hp-replaces-46-77177a3-77177a3","provider":"SeaSierra","version":"1.0","type":"link"}