{"product_id":"water-pump-impeller-kit-with-housing-fits-mercury-mariner-30-70-hp-replaces-46-77177a3-77177a3","title":"Water Pump Impeller Kit with Housing – 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 with Housing\u003c\/strong\u003e is designed for Mercury and Mariner 30-70 HP 2-stroke outboard engines manufactured between 1977 and 1997. It ensures your engine's cooling system functions efficiently by providing all necessary components for a full replacement, protecting the engine from overheating and costly damage.\u003c\/p\u003e\n\u003cp\u003eThe kit serves as a direct replacement for multiple part numbers, including Mercury 46-77177A3 and 77177A3, Sierra 18-3324, GLM 12100, and Tutorautomotive 46-01115, offering a reliable and cost-effective alternative to OEM parts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngineered for direct OEM replacement and fitment.\u003c\/li\u003e\n  \u003cli\u003eIncludes a durable neoprene rubber impeller for robust performance.\u003c\/li\u003e\n  \u003cli\u003eA comprehensive kit containing the housing, gaskets, O-rings, and plates for a complete overhaul.\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 brands.\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\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\u003eTutorautomotive\u003c\/td\u003e\n        \u003ctd\u003e46-01115\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 specifically designed for various Mercury and Mariner outboard engines. Ensure your model and serial number range match the specifications for proper fitment.\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\u003eOutboard\u003c\/td\u003e\n        \u003ctd\u003e30\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1977–1989\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003eSerial #1271884-1448139\u003c\/td\u003e\n      \u003c\/tr\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\u003e\u003c\/td\u003e\n        \u003ctd\u003e46-77177A3\u003c\/td\u003e\n        \u003ctd\u003eSerial #C159200-G589999\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\u003e1979–1983\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\u003eImpeller Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene rubber compound\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eVaries by manufacturer (aftermarket warranties may apply)\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 (47-89983\/18-3007)\u003c\/li\u003e\n  \u003cli\u003e1 x Upper Pump Housing (46-77822A1\/18-3118)\u003c\/li\u003e\n  \u003cli\u003e1 x Water Pump Base (46-77177A1)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e Plate (27-32770\/27-19551)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e2 x\u003c\/span\u003e Drain Gasket (12-20260\/12-19183)\u003c\/li\u003e\n  \u003cli\u003e1 x Drain Plug (12-49221)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e3 x\u003c\/span\u003e Water Pump Base Gasket (27-32771\/27-77417\/27-19552)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e3 x\u003c\/span\u003e O-Ring (25-26855\/25-45711\/25-26722)\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.\u003c\/li\u003e\n  \u003cli\u003eDisassemble the water pump housing to access the old impeller and wear plate.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean all mating surfaces, removing any old gasket material or debris.\u003c\/li\u003e\n  \u003cli\u003eInstall the new gaskets, wear plate, and impeller. Ensure the impeller vanes are oriented correctly (typically by turning the driveshaft clockwise during installation).\u003c\/li\u003e\n  \u003cli\u003eInstall the new housing and torque the bolts to the manufacturer’s specification.\u003c\/li\u003e\n  \u003cli\u003eRe-install the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.\u003c\/li\u003e\n  \u003cli\u003eOnce assembled, start the engine using a water supply (flushing muffs or in water) and verify a steady water 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 can I be sure this kit will fit my engine?\u003c\/summary\u003e\n  \u003cp\u003eThe most reliable method is to check your engine's model, horsepower, and year against our compatibility table. For models with serial number ranges, verifying your engine's serial number is crucial for confirming an exact match.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the common signs of a failing water pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eThe most common symptoms include the engine overheating at idle or low speeds, and a weak or absent stream of water from the tell-tale port. A brittle or cracked impeller discovered during inspection also indicates immediate need for replacement.\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\u003eAs a general maintenance guideline, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if you operate frequently in saltwater or sandy\/silty conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs the pump housing always necessary to replace?\u003c\/summary\u003e\n  \u003cp\u003eWhile the impeller is the most common failure point, the housing can become scored or warped from debris or impeller failure. Since this kit includes a new housing, it is best practice to replace it along with the impeller to ensure optimal pump pressure and longevity.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the difference between this aftermarket kit and an OEM one?\u003c\/summary\u003e\n  \u003cp\u003eThis aftermarket kit is designed to meet or exceed OEM specifications for fit, form, and function. The primary differences are the brand and price. We use high-quality materials, such as durable neoprene for the impeller, to ensure reliable performance at a better value.\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":50723966714171,"sku":"21KM009","price":65.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_with_Housing_for_Mercury_30_JET_35_40_45_50_60_65_70_HP_46-77177A3_-_JLM_MARINE-8286369.jpg?v=1763038644","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-with-housing-fits-mercury-mariner-30-70-hp-replaces-46-77177a3-77177a3","provider":"SeaSierra","version":"1.0","type":"link"}