{"product_id":"water-pump-impeller-kit-fits-mercury-mercruiser-135-150-hp-efi-4-stroke-replaces-46-8m0061040","title":"Water Pump Impeller Kit – Fits Mercury\/MerCruiser 135\/150 HP EFI 4-Stroke (Replaces 46-8M0061040)","description":"\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis \u003cstrong\u003eWater Pump Impeller Kit – Fits Mercury\/MerCruiser 135\/150 HP EFI 4-Stroke (Replaces 46-8M0061040)\u003c\/strong\u003e is engineered for Mercury 135 HP and 150 HP EFI 4-Stroke outboards. It is also compatible with F150 and F75-115 1.7L EFI Four Stroke models that use the same housing style.\u003c\/p\u003e\n  \u003cp\u003eIt serves as a direct replacement for Mercury part numbers 46-8M0061040 and 8M0061040.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eInstalls in the upper water pump housing assembly.\u003c\/li\u003e\n    \u003cli\u003eEngineered as a comprehensive repair kit, including the essential impeller, housing, and gaskets.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\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  \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:320px; }\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  \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\u003e46-8M0061040\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e8M0061040\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\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  \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\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\u003eF150\u003c\/td\u003e\n          \u003ctd\u003e150\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e46-8M0061040\u003c\/td\u003e\n          \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003eF75-115\u003c\/td\u003e\n          \u003ctd\u003e75-115\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e46-8M0061040\u003c\/td\u003e\n          \u003ctd\u003e1.7L EFI\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e135\u003c\/td\u003e\n          \u003ctd\u003e135\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e46-8M0061040\u003c\/td\u003e\n          \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e150\u003c\/td\u003e\n          \u003ctd\u003e150\u003c\/td\u003e\n          \u003ctd\u003e4-Stroke\u003c\/td\u003e\n          \u003ctd\u003e46-8M0061040\u003c\/td\u003e\n          \u003ctd\u003eEFI\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\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\u003eUpper Housing Assembly\u003c\/dd\u003e\n    \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003eWeight: 1.30 lb (0.59 kg); Length: 4.50 in (114.3 mm); Width: 4.25 in (108 mm); Height: 6.25 in (158.8 mm)\u003c\/dd\u003e\n    \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e1.30 lb (0.59 kg)\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Upper Housing\u003c\/li\u003e\n    \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Impeller\u003c\/span\u003e\u003c\/li\u003e\n    \u003cli\u003e1 x Face Plate\u003c\/li\u003e\n    \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Gaskets (Set)\u003c\/span\u003e\u003c\/li\u003e\n    \u003cli\u003e1 x Key\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eDisconnect the battery cables and ensure the engine has completely cooled before starting.\u003c\/li\u003e\n    \u003cli\u003eRemove the gearcase (lower unit) from the outboard by undoing the mounting bolts.\u003c\/li\u003e\n    \u003cli\u003eUnbolt and carefully detach the old water pump housing from the driveshaft. Note the orientation of all parts.\u003c\/li\u003e\n    \u003cli\u003eThoroughly clean the mating surfaces on the gearcase, removing any old gasket material or debris.\u003c\/li\u003e\n    \u003cli\u003eInstall the new key and impeller onto the driveshaft. Assemble the new base plate, gaskets, and upper housing.\u003c\/li\u003e\n    \u003cli\u003eApply a light coat of marine grease to the interior of the housing and bolt threads.\u003c\/li\u003e\n    \u003cli\u003eSecure the new water pump assembly, tightening the bolts to the manufacturer's recommended torque specification.\u003c\/li\u003e\n    \u003cli\u003eReinstall the lower unit, reconnect the battery, and test the engine's cooling system in water before full operation.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\u003csummary\u003eHow do I verify this kit fits my motor?\u003c\/summary\u003e\u003cp\u003eThis kit fits specific Mercury 135\/150 HP EFI 4-Stroke outboards and select F75-115 1.7L models. The most reliable method is to match your engine's original part number to 46-8M0061040. Use the compatibility table and images to confirm, but always prioritize the part number.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eWhat are the signs of a worn water pump impeller?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include the engine overheating at low RPMs, a weak or no water stream from the tell-tale port, or a brittle, cracked, or melted appearance on the old impeller's vanes during inspection.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eHow often should I replace my engine's water pump impeller?\u003c\/summary\u003e\u003cp\u003eAs a best practice for preventative maintenance, we recommend replacing the impeller every 100-200 operating hours or every 1-2 years, whichever comes first. Usage in saltwater or silty\/sandy conditions may require more frequent changes.\u003c\/p\u003e\u003c\/details\u003e\n  \u003cdetails\u003e\u003csummary\u003eAre special tools required for this installation?\u003c\/summary\u003e\u003cp\u003eStandard marine workshop tools like a socket set, wrenches, and a screwdriver are generally sufficient. A torque wrench is highly recommended to ensure the housing bolts are tightened to proper OEM specifications, preventing leaks and damage.\u003c\/p\u003e\u003c\/details\u003e\n  \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\n  \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\n  \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\n\u003c\/section\u003e\n\u003csection\u003e\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\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n    \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003eManufacturer-Direct Value — 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":50718268981563,"sku":"18KM002-3","price":79.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_Kit_for_Mercury135_-_150_HP_EFI_4-Stroke_46-8M0061040_-_JLM_MARINE-8289840.jpg?v=1762958653","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-kit-fits-mercury-mercruiser-135-150-hp-efi-4-stroke-replaces-46-8m0061040","provider":"SeaSierra","version":"1.0","type":"link"}