{"product_id":"57-34359-v-belt-for-mercruiser-3-7l-4-3l-5-0l-5-7l-sterndrive-engines","title":"57-34359 V-Belt for MerCruiser 3.7L 4.3L 5.0L 5.7L Sterndrive Engines | JLM Marine","description":"\u003ch2\u003e57-34359 V-Belt for MerCruiser 3.7L 4.3L 5.0L 5.7L Sterndrive Engines | JLM Marine\u003c\/h2\u003e\n\n\u003cp\u003eThis high-quality \u003cstrong\u003ealternator drive V-belt\u003c\/strong\u003e is engineered for \u003cstrong\u003eMerCruiser 3.7L, 4.3L, 5.0L, and 5.7L sterndrive engines\u003c\/strong\u003e manufactured between 1973 and 1995. Designed to deliver reliable performance in demanding marine environments, this belt ensures consistent power delivery from your alternator and water pump.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket replacement directly cross-references \u003cstrong\u003eOEM part numbers 57-33170, 57-33170Q, 57-37619T, and 57-34359\u003c\/strong\u003e, as well as Sierra 18-15520, providing broad compatibility across multiple MerCruiser sterndrive applications.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e51-inch V-belt\u003c\/strong\u003e designed specifically for water pump and alternator drive applications\u003c\/li\u003e\n  \u003cli\u003eDirect fit for MerCruiser 3.7L, 4.3L, 5.0L, and 5.7L sterndrive engines\u003c\/li\u003e\n  \u003cli\u003eReplaces multiple OEM part numbers for simplified sourcing\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\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\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\u003e57-34359\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMerCruiser OEM\u003c\/td\u003e\n      \u003ctd\u003e57-33170\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMerCruiser OEM\u003c\/td\u003e\n      \u003ctd\u003e57-33170Q\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMerCruiser OEM\u003c\/td\u003e\n      \u003ctd\u003e57-37619T\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSierra\u003c\/td\u003e\n      \u003ctd\u003e18-15520\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\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\" style=\"border-collapse:collapse; width:100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eEngine Displacement\u003c\/th\u003e\n      \u003cth\u003eModel \/ HP\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\u003e3.7L\u003c\/td\u003e\n      \u003ctd\u003e185 (4bbl)\u003c\/td\u003e\n      \u003ctd\u003e1983-1984\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e3.7L\u003c\/td\u003e\n      \u003ctd\u003e175\u003c\/td\u003e\n      \u003ctd\u003e1987\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e3.7L\u003c\/td\u003e\n      \u003ctd\u003e185 (2bbl)\u003c\/td\u003e\n      \u003ctd\u003e1985-1986\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e3.7L\u003c\/td\u003e\n      \u003ctd\u003e205\u003c\/td\u003e\n      \u003ctd\u003e1985-1991\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e4.3L\u003c\/td\u003e\n      \u003ctd\u003e175 \/ 185 \/ 4.3L\u003c\/td\u003e\n      \u003ctd\u003e1985-1992\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.0L\u003c\/td\u003e\n      \u003ctd\u003e225 (FORD)\u003c\/td\u003e\n      \u003ctd\u003e1973-1974\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.0L\u003c\/td\u003e\n      \u003ctd\u003e200\u003c\/td\u003e\n      \u003ctd\u003e1985-1987\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.0L\u003c\/td\u003e\n      \u003ctd\u003e228\u003c\/td\u003e\n      \u003ctd\u003e1983-1984\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.0L\u003c\/td\u003e\n      \u003ctd\u003e228 \/ 230 \/ 5.0L MIE\u003c\/td\u003e\n      \u003ctd\u003e1978-1987\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.0L\u003c\/td\u003e\n      \u003ctd\u003e230\u003c\/td\u003e\n      \u003ctd\u003e1985-1987\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.0L\u003c\/td\u003e\n      \u003ctd\u003e5.0LX\u003c\/td\u003e\n      \u003ctd\u003e1988\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.0L\u003c\/td\u003e\n      \u003ctd\u003e898\u003c\/td\u003e\n      \u003ctd\u003e1983-1984\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.0L\u003c\/td\u003e\n      \u003ctd\u003e898 \/ 200 \/ 5.0L\u003c\/td\u003e\n      \u003ctd\u003e1985-1995\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.7L\u003c\/td\u003e\n      \u003ctd\u003e260 \/ 5.7L\u003c\/td\u003e\n      \u003ctd\u003e1983-1995\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.7L\u003c\/td\u003e\n      \u003ctd\u003e320 EFI\u003c\/td\u003e\n      \u003ctd\u003e1987-1989\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.7L\u003c\/td\u003e\n      \u003ctd\u003e350 MAG ALPHA\u003c\/td\u003e\n      \u003ctd\u003e1986-1995\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5.7L\u003c\/td\u003e\n      \u003ctd\u003e5.7L\u003c\/td\u003e\n      \u003ctd\u003e1988-1995\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\" style=\"border-collapse:collapse; width:100%;\"\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 Number\u003c\/td\u003e\n      \u003ctd\u003e57-34359\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eType\u003c\/td\u003e\n      \u003ctd\u003eWater Pump V-Belt\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBelt Length\u003c\/td\u003e\n      \u003ctd\u003e51 inches\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMotor \u0026amp; Engine Type\u003c\/td\u003e\n      \u003ctd\u003eMerCruiser 3.7L 4.3L 5.0L 5.7L Sterndrive Engines\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\u003eThis package includes:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 × 51\" V-Belt\u003c\/strong\u003e\u003c\/span\u003e\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 ensure safety before beginning any work on your engine.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccess the belt area\u003c\/strong\u003e by removing any engine covers or components obstructing the alternator and water pump pulleys.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelease tension\u003c\/strong\u003e on the old belt by loosening the alternator mounting bolts or adjusting the tensioner mechanism.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRemove the old belt\u003c\/strong\u003e from the pulleys, noting the routing path for proper reinstallation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInspect all pulleys\u003c\/strong\u003e for wear, damage, or debris, and clean if necessary.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoute the new 51\" V-belt\u003c\/strong\u003e around the water pump, crankshaft, and alternator pulleys following the original path.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjust the alternator position\u003c\/strong\u003e to achieve proper belt tension—typically 1\/2 inch deflection with moderate thumb pressure at the belt's midpoint.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTighten all mounting bolts\u003c\/strong\u003e securely once proper tension is achieved.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRotate the pulleys by hand\u003c\/strong\u003e to confirm the belt is seated correctly and running smoothly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReinstall any covers or components\u003c\/strong\u003e removed during access.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReconnect the battery\u003c\/strong\u003e and start the engine to verify proper operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCheck belt tension\u003c\/strong\u003e after initial run-in and re-adjust if necessary.\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 V-belt fits my MerCruiser engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Cross-reference your engine model and year with the compatibility table above. Also verify that your current belt matches OEM part numbers 57-33170, 57-33170Q, 57-37619T, or 57-34359. If your engine is listed but the belt length differs, do not purchase.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my alternator drive belt?\u003c\/strong\u003e\u003cbr\u003e\nA: Inspect your V-belt every 100 hours of operation or annually. Replace immediately if you notice cracking, fraying, glazing, or slippage. Most marine belts should be replaced every 2-3 years or 300-500 hours under normal conditions.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my V-belt is failing?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include squealing noise during acceleration, dimming electrical accessories, battery not charging, overheating engine, or visible belt damage such as cracks and glazing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How tight should the belt be after installation?\u003c\/strong\u003e\u003cbr\u003e\nA: Proper tension allows approximately 1\/2 inch (12-13mm) of deflection when moderate thumb pressure is applied at the belt's longest span. Over-tightening can damage bearings; under-tightening causes slippage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM belt or aftermarket?\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":50976591118649,"sku":"23BL354","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/23BL354_1.jpg?v=1755251205","url":"https:\/\/jlmmarine.com\/products\/57-34359-v-belt-for-mercruiser-3-7l-4-3l-5-0l-5-7l-sterndrive-engines","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}