{"product_id":"864625t-serpentine-belt-idler-pulley-for-mercruiser-v6-v8-4-3l-5-0l-5-7l-6-2l-8-2l","title":"864625T Serpentine Belt Idler Pulley for Mercruiser V6 V8 4.3L 5.0L 5.7L 6.2L 8.2L | JLM Marine","description":"\u003ch2\u003e864625T Serpentine Belt Idler Pulley for Mercruiser V6 V8 4.3L 5.0L 5.7L 6.2L 8.2L\u003c\/h2\u003e\n\n\u003cp\u003eThis \u003cstrong\u003e4-1\/4\" Serpentine Belt Idler Pulley\u003c\/strong\u003e is engineered for \u003cstrong\u003e1999 and newer Mercruiser Stern Drive engines\u003c\/strong\u003e, including \u003cstrong\u003e4.3L, 5.0L, 5.7L, 6.2L, and 8.2L V6\/V8\u003c\/strong\u003e configurations with Alpha and Bravo stern drives. It ensures proper belt tension and reliable performance in demanding marine environments.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket replacement directly cross-references \u003cstrong\u003eOEM 864625T, 849296T\u003c\/strong\u003e, and multiple industry part numbers including \u003cstrong\u003e57-8638764, 57-862086, 57-862086A1, 57-865615004, 57-865615Q04, and 18-15101\u003c\/strong\u003e, providing broad compatibility across Mercruiser engine platforms.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulley Size:\u003c\/strong\u003e 4-1\/4 inches diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Engine idler pulley for serpentine belt systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Race stern drive and standard Mercruiser V6\/V8 engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\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\u003eMercruiser OEM\u003c\/td\u003e\n\u003ctd\u003e864625T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser OEM\u003c\/td\u003e\n\u003ctd\u003e849296T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e57-8638764\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e57-862086\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e57-8620861\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e57-862086A1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e57-865615004\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e57-865615Q04\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e18-15101\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\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\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eYears\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\u003e4.3L V6\u003c\/td\u003e\n\u003ctd\u003e1999 and newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser\u003c\/td\u003e\n\u003ctd\u003e5.0L V8\u003c\/td\u003e\n\u003ctd\u003e1999 and newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser\u003c\/td\u003e\n\u003ctd\u003e5.7L V8\u003c\/td\u003e\n\u003ctd\u003e1999 and newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e1999 and newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser\u003c\/td\u003e\n\u003ctd\u003e8.2L V8\u003c\/td\u003e\n\u003ctd\u003e1999 and newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser\u003c\/td\u003e\n\u003ctd\u003eAlpha Stern Drive\u003c\/td\u003e\n\u003ctd\u003e1999 and newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser\u003c\/td\u003e\n\u003ctd\u003eBravo Stern Drive\u003c\/td\u003e\n\u003ctd\u003e1999 and newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercruiser\u003c\/td\u003e\n\u003ctd\u003eRace Stern Drive\u003c\/td\u003e\n\u003ctd\u003e1999 and newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e864625T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePulley Size\u003c\/td\u003e\n\u003ctd\u003e4-1\/4 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eEngine Idler Pulley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Type\u003c\/td\u003e\n\u003ctd\u003eMerCruiser V6 V8 Engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eSerpentine Belt System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eYour package includes the following component:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 × Serpentine Belt Idler Pulley (4-1\/4\")\u003c\/strong\u003e\u003c\/span\u003e – Same as picture shown\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisconnect the battery\u003c\/strong\u003e to prevent electrical hazards during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocate the existing serpentine belt idler pulley\u003c\/strong\u003e on your Mercruiser engine. Refer to your engine manual if needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelease tension on the serpentine belt\u003c\/strong\u003e using the tensioner tool or appropriate wrench to loosen the belt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove the serpentine belt\u003c\/strong\u003e from the idler pulley and other pulleys, noting the belt routing for reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnbolt the old idler pulley\u003c\/strong\u003e from its mounting bracket using the appropriate socket or wrench.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInspect the mounting surface and bracket\u003c\/strong\u003e for wear, damage, or debris; clean if necessary.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition the new 4-1\/4\" idler pulley\u003c\/strong\u003e onto the mounting bracket, aligning the bolt holes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure the pulley with the mounting bolt\u003c\/strong\u003e, tightening to manufacturer's torque specifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRe-route the serpentine belt\u003c\/strong\u003e according to the original path, ensuring it sits properly on all pulleys including the new idler.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply tension to the belt\u003c\/strong\u003e using the tensioner, ensuring proper belt alignment and tension.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReconnect the battery\u003c\/strong\u003e and start the engine briefly to verify smooth belt operation without slipping or noise.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerform a final visual inspection\u003c\/strong\u003e to confirm the belt is running true on all pulleys and the idler is functioning correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this idler pulley fits my Mercruiser engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine is a 1999 or newer Mercruiser 4.3L, 5.0L, 5.7L, 6.2L, or 8.2L V6\/V8 with Alpha, Bravo, or Race stern drive. Cross-reference your current pulley's OEM number (864625T, 849296T, or equivalents listed) and confirm the 4-1\/4\" diameter matches your original part.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my idler pulley needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include squealing or chirping noises from the belt area, visible wobbling or play in the pulley, excessive belt wear or fraying, and rough or grinding bearing feel when spinning the pulley by hand with the belt removed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the serpentine belt idler pulley?\u003c\/strong\u003e\u003cbr\u003e\nA: Inspect the idler pulley during routine maintenance or whenever replacing the serpentine belt (typically every 3–5 years or per your engine's service schedule). Replace immediately if you notice noise, wobble, rough bearing rotation, or any visible damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or aftermarket replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: 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\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: 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\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: 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\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\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\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\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":50990712193337,"sku":"23TP206","price":27.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/23TP206_1.jpg?v=1755251121","url":"https:\/\/jlmmarine.com\/ru\/products\/864625t-serpentine-belt-idler-pulley-for-mercruiser-v6-v8-4-3l-5-0l-5-7l-6-2l-8-2l","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}