{"product_id":"water-pump-impeller-key-for-mercruiser-mercury-mariner-force-mc1-r-mr-alpha-one","title":"Water Pump Impeller \u0026 Key for Mercruiser Mercury Mariner Force MC1 R MR Alpha One | JLM Marine","description":"\u003ch2\u003eGear Housing Components for Mercruiser Mercury Mariner Force MC1 R MR Alpha One\u003c\/h2\u003e\n\u003cp\u003eThis comprehensive gear housing component set is engineered to fit a wide range of \u003cstrong\u003eMercruiser MC1\/R and MR\/Alpha One\u003c\/strong\u003e stern drives, as well as \u003cstrong\u003eMercury Mariner L4, L6 \u0026amp; V6 outboards (65–225 HP)\u003c\/strong\u003e and \u003cstrong\u003eForce outboards (75–150 HP)\u003c\/strong\u003e. Designed as a direct aftermarket replacement, this package ensures reliable performance across multiple marine drive configurations.\u003c\/p\u003e\n\u003cp\u003eWhether you're servicing a Mercruiser stern drive or a Mercury\/Force outboard, this kit delivers the essential components needed to maintain proper water pump operation and gear housing integrity.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes \u003cstrong\u003eoutboard rubber impeller with key\/pin\u003c\/strong\u003e for complete installation\u003c\/li\u003e\n\u003cli\u003eCompatible with both stern drive and outboard applications\u003c\/li\u003e\n\u003cli\u003eFits multiple horsepower ranges from 65 HP to 225 HP\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"width: 100%; border-collapse: collapse;\"\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\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser\u003c\/td\u003e\n\u003ctd\u003eMC1 \/ R\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eGear housing components\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser\u003c\/td\u003e\n\u003ctd\u003eMR \/ Alpha One\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eGear housing components\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eL4, L6 \u0026amp; V6\u003c\/td\u003e\n\u003ctd\u003e65–225 HP\u003c\/td\u003e\n\u003ctd\u003eOutboard engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForce\u003c\/td\u003e\n\u003ctd\u003eOutboard\u003c\/td\u003e\n\u003ctd\u003e75, 90, 120, 140, 150 HP\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\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cp\u003eThis kit includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color: red;\"\u003e\u003cstrong\u003eOutboard Rubber Impeller with Key \/ Pin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect the battery and raise the drive unit or outboard to access the gear housing. Ensure the engine is completely cool before beginning work.\u003c\/li\u003e\n\u003cli\u003eRemove the lower unit according to your service manual. This typically involves draining gear oil and disconnecting the shift linkage.\u003c\/li\u003e\n\u003cli\u003eLocate the water pump housing on the lower unit. Remove the retaining screws or bolts securing the pump cover.\u003c\/li\u003e\n\u003cli\u003eCarefully extract the old impeller, noting the direction of the vanes. Inspect the pump housing for wear or damage.\u003c\/li\u003e\n\u003cli\u003eClean the impeller cavity thoroughly, removing any debris, old gasket material, or corrosion.\u003c\/li\u003e\n\u003cli\u003eApply a thin coat of glycerin or soapy water to the new impeller vanes to ease installation. Never use petroleum-based lubricants.\u003c\/li\u003e\n\u003cli\u003eInsert the key or pin into the impeller shaft slot, ensuring it seats properly in the groove.\u003c\/li\u003e\n\u003cli\u003eInstall the new impeller with vanes oriented in the correct direction (typically curved forward in the direction of rotation). Rotate the drive shaft gently to help seat the impeller.\u003c\/li\u003e\n\u003cli\u003eReplace any gaskets or O-rings included in your kit. Install the water pump cover and torque fasteners to manufacturer specifications.\u003c\/li\u003e\n\u003cli\u003eReassemble the lower unit to the gear housing, reconnecting shift linkage and ensuring proper alignment.\u003c\/li\u003e\n\u003cli\u003eRefill the gear case with the correct grade and quantity of gear oil. Check for leaks at all seals.\u003c\/li\u003e\n\u003cli\u003eReconnect the battery, run the engine in a test tank or on-water, and verify strong water flow from the tell-tale.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this fits my Mercruiser or Mercury engine?\u003c\/strong\u003e\u003cbr\u003eA: Cross-reference your engine model and horsepower with the compatibility table above. For Mercruiser stern drives, verify your model is MC1, R, MR, or Alpha One. For Mercury outboards, confirm you have an L4, L6, or V6 engine rated between 65–225 HP. If uncertain, consult your owner's manual or use the serial number guides linked above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the impeller?\u003c\/strong\u003e\u003cbr\u003eA: Marine impellers should be replaced annually or every 200–300 hours of operation, whichever comes first. If you operate in debris-heavy waters, sandy conditions, or notice reduced water flow, inspect and replace more frequently.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my impeller is failing?\u003c\/strong\u003e\u003cbr\u003eA: Common symptoms include weak or no water discharge from the tell-tale, engine overheating, steam from the exhaust, or pieces of rubber in the water pump housing. If you observe any of these, stop the engine immediately and inspect the impeller.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this impeller kit on both stern drives and outboards?\u003c\/strong\u003e\u003cbr\u003eA: Yes, this kit is designed for both Mercruiser stern drive gear housings (MC1\/R, MR\/Alpha One) and Mercury\/Force outboard lower units within the specified horsepower ranges. Always verify fitment against your specific model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between this aftermarket impeller and the OEM part?\u003c\/strong\u003e\u003cbr\u003eA: This is an aftermarket replacement part built to meet OEM specifications. We use comparable-grade rubber compounds and precision molding to ensure reliable water flow and durability. Production is done in an ISO9002-certified facility with rigorous quality control, offering excellent value compared to OEM pricing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need any special tools to install this impeller?\u003c\/strong\u003e\u003cbr\u003eA: Basic hand tools (screwdrivers, wrenches, sockets) are typically sufficient. You may also need a gear oil pump, drain pan, and torque wrench. Refer to your engine's service manual for model-specific tool requirements and torque specifications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or aftermarket?\u003c\/strong\u003e\u003cbr\u003eA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003eA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003eA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50488877973817,"sku":"17IC004-K","price":21.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Water_Pump_Impeller_Kit_for_Mercury_-__Mercruiser_-_OMC_-_Johnson_-_Evinrude_Impeller_Service_Set_65_to_225_hp_47-89984T4_-_JLM_MARINE-8289798.jpg?v=1755252001","url":"https:\/\/jlmmarine.com\/products\/water-pump-impeller-key-for-mercruiser-mercury-mariner-force-mc1-r-mr-alpha-one","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}