{"product_id":"water-pump-impeller-fits-mercury-marine-3-9-6-9-8-hp-replaces-mercury-marine-47-22748-sierra-marine-18-3074","title":"Water Pump Impeller – Fits Mercury Marine 3.9, 6 \u0026 9.8 HP (Replaces Mercury Marine 47-22748, Sierra Marine 18-3074)","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 – Fits Mercury Marine 3.9, 6 \u0026amp; 9.8 HP (Replaces 47-22748)\u003c\/strong\u003e is a direct-fit replacement for maintaining the cooling system on Mercury Marine 2-Stroke 3.9 HP, 6 HP (1974–2007) and 4-Stroke 9.8 HP engines. Engineered for reliability, it ensures your engine receives proper water circulation to prevent overheating.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct cross-reference for multiple part numbers, including Mercury Marine 47-22748, Sierra Marine 18-3074, and Mallory 9-45308.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstallation Method: Direct Replacement\u003c\/li\u003e\n  \u003cli\u003eEnvironment: Fully compatible with saltwater and freshwater\u003c\/li\u003e\n  \u003cli\u003eIncluded Components: Impeller with brass hub\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 Marine\u003c\/td\u003e\n\u003ctd\u003e47-22748\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003ctd\u003e18-3074\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-45308\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAM\u003c\/td\u003e\n\u003ctd\u003eAM47-22748\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e89600\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSEI Marine\u003c\/td\u003e\n\u003ctd\u003e96-299-03C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCEF\u003c\/td\u003e\n\u003ctd\u003e500309\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\u003eFor Mercury engines, please verify your model and serial number range (S\/N) 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\u003e3.9\u003c\/td\u003e\n\u003ctd\u003e3.9 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eS\/N 1655013–2498135\u003c\/td\u003e\n\u003ctd\u003e47-22748\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eS\/N 888005–1916138\u003c\/td\u003e\n\u003ctd\u003e47-22748\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e9.8\u003c\/td\u003e\n\u003ctd\u003e9.8 HP\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003emodel 110 (2 CYL)\u003c\/td\u003e\n\u003ctd\u003e47-22748\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMark 5\u003c\/td\u003e\n\u003ctd\u003e5 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eS\/N 574128–786612\u003c\/td\u003e\n\u003ctd\u003e47-22748\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003eMark 6, 6A\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eS\/N 888005–UP\u003c\/td\u003e\n\u003ctd\u003e47-22748\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e3.5 HP\u003c\/td\u003e\n\u003ctd\u003e3.5 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eS\/N 358136–6202172\u003c\/td\u003e\n\u003ctd\u003e47-22748\u003c\/td\u003e\n\u003ctd\u003e\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\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect Replacement\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eNeoprene with Brass Hub\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eBlade Dimensions\u003c\/dt\u003e\n\u003cdd\u003eA: 11.60mm (0.456\"), B: 32.00mm (1.26\"), C: 14.40mm (0.567\")\u003c\/dd\u003e\n  \u003cdt\u003eNumber of Blades\u003c\/dt\u003e\n\u003cdd\u003e6\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e90g (0.45 oz)\u003c\/dd\u003e\n  \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eDirect Fit\u003c\/dd\u003e\n  \u003cdt\u003eSaltwater Rating\u003c\/dt\u003e\n\u003cdd\u003eCompatible\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Water Pump Impeller (47-22748)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery to prevent accidental starting.\u003c\/li\u003e\n  \u003cli\u003ePlace a container under the lower unit and drain the gearcase lube.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit (outdrive) from the engine assembly.\u003c\/li\u003e\n  \u003cli\u003eUnbolt and remove the water pump housing to access the old impeller.\u003c\/li\u003e\n  \u003cli\u003eInspect the housing, wear plate, and seals for scoring, warping, or damage. Replace if necessary.\u003c\/li\u003e\n  \u003cli\u003eSlide the new impeller onto the driveshaft, ensuring the blades are oriented correctly (typically in the direction of shaft rotation).\u003c\/li\u003e\n  \u003cli\u003eReassemble the water pump housing, applying a light coat of marine grease.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit, ensuring the driveshaft and water tube are properly aligned.\u003c\/li\u003e\n  \u003cli\u003eRefill the gearcase with the manufacturer-specified lubricant.\u003c\/li\u003e\n  \u003cli\u003eOnce reassembled, start the engine in water and verify a strong, steady stream from the \"telltale\" water outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if this impeller fits my Mercury engine?\u003c\/summary\u003e\u003cp\u003eRefer to the compatibility table and verify your engine model, horsepower, and, most importantly, its serial number (S\/N). If your engine's S\/N falls within the specified range for your model, this part should fit.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include the engine overheating, especially at idle or low speeds; a weak or non-existent water stream from the \"telltale\" outlet; and a brittle or cracked appearance on the old impeller's blades upon inspection.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should I replace my outboard's impeller?\u003c\/summary\u003e\u003cp\u003eFor preventative maintenance, it is recommended to replace the impeller every 1 to 2 years, or every 100-200 hours of operation. More frequent replacement may be necessary if operating primarily in saltwater or sandy\/silty conditions.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this impeller safe for saltwater use?\u003c\/summary\u003e\u003cp\u003eYes. This impeller is manufactured with a durable neoprene housing and a corrosion-resistant brass hub, making it fully suitable for saltwater environments.\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). It has been built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 facility and are batch-inspected for consistency and quality.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit is 5–15 days for most regions. Standard shipping is free; expedited options will appear at checkout where available for your location.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, 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 condition. See our policy page or reach out for instructions.\u003c\/p\u003e\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 purchasing. 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 OEM part.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is highly recommended for safety and optimal 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 conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions with a typical transit time of 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723963896123,"sku":"17IM002K","price":23.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_for_Mercury_39_6_98_HP_47-22748_-_JLM_MARINE-8288494.jpg?v=1763038521","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-fits-mercury-marine-3-9-6-9-8-hp-replaces-mercury-marine-47-22748-sierra-marine-18-3074","provider":"SeaSierra","version":"1.0","type":"link"}