{"product_id":"water-pump-impeller-repair-kit-fits-mercury-mariner-15-hp-outboards-replaces-8m0070780-42038q3","title":"Water Pump Impeller Repair Kit – Fits Mercury\/Mariner 15 HP Outboards (Replaces 8M0070780, 42038Q3)","description":"\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\u003csection\u003e\n    \u003ch2\u003eProduct Details\u003c\/h2\u003e\n    \u003cp\u003eThis \u003cstrong\u003eWater Pump Impeller Repair Kit\u003c\/strong\u003e is engineered for Mercury and Mariner 15 HP two-stroke outboard motors. It includes all the essential components to service the lower unit water pump assembly, addressing a worn or damaged impeller to restore engine cooling performance.\u003c\/p\u003e\n    \u003cp\u003eThis kit is a direct replacement for Mercury part numbers 8M0070780, 42038T3, and Quicksilver aftermarket number 42038Q3.\u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInstallation Location:\u003c\/strong\u003e Lower unit gearcase.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSpecific Fitment:\u003c\/strong\u003e Designed for Mercury\/Mariner 15 HP carburetor models with SeaPro designation.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Restores water circulation to prevent engine overheating.\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    \u003cdiv class=\"ss-table-wrap\"\u003e\n        \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n            \u003cthead\u003e\n                \u003ctr\u003e\n                    \u003cth\u003eBrand\u003c\/th\u003e\n                    \u003cth\u003ePart Number\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\u003e8M0070780\u003c\/td\u003e\n                    \u003ctd\u003eOEM Part Number\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003eMercury\u003c\/td\u003e\n                    \u003ctd\u003e42038T3\u003c\/td\u003e\n                    \u003ctd\u003eAlternative OEM Number\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003eQuicksilver\u003c\/td\u003e\n                    \u003ctd\u003e42038Q3\u003c\/td\u003e\n                    \u003ctd\u003eAftermarket Replacement\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    \u003cp\u003e\u003cstrong\u003eFor Mercury \u0026amp; Mariner Outboards:\u003c\/strong\u003e This kit is intended for the specific 2-stroke models listed. Always verify your engine's serial number or original part number before ordering.\u003c\/p\u003e\n    \u003cdiv class=\"ss-table-wrap\"\u003e\n        \u003ctable class=\"ss-table\" aria-label=\"Engine 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\u003e15 HP Carb SeaPro\u003c\/td\u003e\n                    \u003ctd\u003e15\u003c\/td\u003e\n                    \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                    \u003ctd\u003e8M0070780\u003c\/td\u003e\n                    \u003ctd\u003eLower unit gearcase\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003eMercury\u003c\/td\u003e\n                    \u003ctd\u003e15 HP\u003c\/td\u003e\n                    \u003ctd\u003e15\u003c\/td\u003e\n                    \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                    \u003ctd\u003e42038T3\u003c\/td\u003e\n                    \u003ctd\u003eFor Mercury and Mariner outboards\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n                    \u003ctd\u003e6–15 HP\u003c\/td\u003e\n                    \u003ctd\u003e6–15\u003c\/td\u003e\n                    \u003ctd\u003e2-Stroke\u003c\/td\u003e\n                    \u003ctd\u003e42038Q3\u003c\/td\u003e\n                    \u003ctd\u003eQuicksilver aftermarket part\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\u003eLower unit replacement\u003c\/dd\u003e\n        \u003cdt\u003eHousing Color\u003c\/dt\u003e\n        \u003cdd\u003eBlack\u003c\/dd\u003e\n        \u003cdt\u003eCompatible Engines\u003c\/dt\u003e\n        \u003cdd\u003eFits Mercury\/Mariner 15 HP carburetor models with SeaPro designation\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\u003eWater Pump Impeller (Replaces 42038K02)\u003c\/li\u003e\n        \u003cli\u003eGaskets and Seals\u003c\/li\u003e\n        \u003cli\u003eHousing Components\u003c\/li\u003e\n    \u003c\/ul\u003e\nsection\u0026gt;\n\u003csection\u003e\n    \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n    \u003col\u003e\n        \u003cli\u003eDisconnect the battery and shift linkage.\u003c\/li\u003e\n        \u003cli\u003eRemove the lower unit mounting bolts and carefully lower the gearcase assembly.\u003c\/li\u003e\n        \u003cli\u003eUnbolt and remove the existing water pump housing.\u003c\/li\u003e\n        \u003cli\u003eNote the rotational direction of the old impeller's vanes before removal.\u003c\/li\u003e\n        \u003cli\u003eClean all mating surfaces of debris and old gasket material.\u003c\/li\u003e\n        \u003cli\u003eInstall the new wear plate, gaskets, and seals as provided in the kit.\u003c\/li\u003e\n        \u003cli\u003eSlide the new impeller onto the driveshaft, turning the shaft clockwise to seat the vanes correctly inside the housing.\u003c\/li\u003e\n        \u003cli\u003eReinstall the water pump housing and torque its bolts to manufacturer specifications.\u003c\/li\u003e\n        \u003cli\u003eCarefully guide the lower unit back into place, ensuring the driveshaft and water tube align.\u003c\/li\u003e\n        \u003cli\u003eSecure the mounting bolts, reattach the shift linkage, and reconnect the battery.\u003c\/li\u003e\n        \u003cli\u003eStart the engine and immediately check the tell-tale for a strong, steady stream of water.\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\n        \u003csummary\u003eHow do I know if my water pump impeller is failing?\u003c\/summary\u003e\n        \u003cp\u003eCommon signs of a failing impeller include a weak or non-existent water stream from the \"tell-tale\" outlet, engine overheating alarms, or a reduction in engine performance. Visible damage like cracked, brittle, or missing vanes on the old impeller during an inspection also indicates a need for replacement.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eHow often should this part be replaced?\u003c\/summary\u003e\n        \u003cp\u003eAs a routine maintenance item, it is recommended to replace the water pump impeller every 1 to 2 years or every 100-200 hours of operation, whichever comes first. Service intervals should be shorter for boats used in saltwater or in water with heavy sediment.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eWill this kit fit 4-stroke Mercury models?\u003c\/summary\u003e\n        \u003cp\u003eNo, this kit is specifically designed for the 15 HP 2-stroke outboard models listed in the compatibility table, including SeaPro variants. It is not compatible with 4-stroke engines. Always confirm your engine's specific model and part number requirements before ordering.\u003c\/p\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n        \u003csummary\u003eWhat is the difference between the part numbers 8M0070780, 42038T3, and 42038Q3?\u003c\/summary\u003e\n        \u003cp\u003eThese part numbers are interchangeable for this application. 8M0070780 is a primary Mercury OEM part number, 42038T3 is a related OEM number, and 42038Q3 is a common cross-reference for the Quicksilver aftermarket equivalent. All are designed to fit the same set of engines.\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 is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for consistency and quality.\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 is 5–15 days. Standard shipping is free; expedited options will 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\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use. If 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 their original condition. See our full policy page or reach out for instructions.\u003c\/p\u003e\n    \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 the images and specifications against your original part before purchasing. If anything differs—even if your model appears on a compatibility list—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 optimal 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\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions, with an average transit time of 5–15 days.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Our model provides fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\u003c\/section\u003e\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718270357819,"sku":"24KM153-QM","price":89.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/24KM153-QM.png?v=1762958702","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-repair-kit-fits-mercury-mariner-15-hp-outboards-replaces-8m0070780-42038q3","provider":"SeaSierra","version":"1.0","type":"link"}