{"product_id":"drive-belt-fits-mercruiser-volvo-penta-17-350hp-replaces-57-74271q-966903","title":"Drive Belt – Fits MerCruiser \u0026 Volvo Penta 17-350HP (Replaces 57-74271Q, 966903)","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 *\/\ntable.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\ntable.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 *\/\ntable.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 high-quality aftermarket \u003cstrong\u003eDrive Belt – Fits MerCruiser \u0026amp; Volvo Penta 17-350HP (Replaces 57-74271Q, 966903)\u003c\/strong\u003e is engineered for a wide range of marine engines. It is designed for MerCruiser models from 175HP to 350HP (4-Stroke, including 4.3L, 5.0L, and 5.7L from 1978–1995) and various Volvo Penta 2001, 2002, and 2003 Series diesel engines (17-30HP), plus the MD17C (2001 Alt) from the 1980s–1990s.\u003c\/p\u003e\n\u003cp\u003eThis component serves as a direct interchange for MerCruiser part numbers 57-68038, 57-74271Q, 57-74271T, 57-77274, 68038, 74271, 74271T, 77274A1; Volvo Penta 960281, 966903; and OMC 0509306, 0509308.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstalls on the engine accessory drive to operate components like the alternator, water pump, or power steering (varies by engine).\u003c\/li\u003e\n\u003cli\u003eConstructed from durable, high-strength rubber to meet demanding marine conditions.\u003c\/li\u003e\n\u003cli\u003eProtected by a 1-year warranty against manufacturing defects for peace of mind.\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 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\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-68038\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-74271T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e57-77274\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e68038\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e74271\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e74271T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e77274A1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e960281\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e966903\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e0509306\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e0509308\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\u003eFor MerCruiser models, please verify your engine's serial number falls within the specified range for a guaranteed fit.\u003c\/p\u003e\n\u003cp\u003eFor Volvo Penta, this belt fits the listed diesel engine series and specific MD17C applications.\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\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e175\/185\/4.3L\u003c\/td\u003e\n\u003ctd\u003e175-185\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–1992\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003ctd\u003eEngine Serial A331455-D714106\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e898\/200\/5.0L\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–1995\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003ctd\u003eEngine Serial 6218462-F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e228\/230\/5.0L\u003c\/td\u003e\n\u003ctd\u003e228-230\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983–1995\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003ctd\u003eEngine Serial 6218462-F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e228\/230\/5.0L MIE\u003c\/td\u003e\n\u003ctd\u003e228-230\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1978–1987\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003ctd\u003eEngine Serial 4929030-B788151\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e255\/260\/5.7L MIE \u0026amp; Ski\u003c\/td\u003e\n\u003ctd\u003e255-260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1978–1986\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003ctd\u003eEngine Serial 4924565-B522505\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e260\/5.7L MIE \u0026amp; Ski\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1987–1993\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003ctd\u003eEngine Serial B522506-F024999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e260\/5.7L\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983–1995\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003ctd\u003eEngine Serial 6218462-F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e350 MAG\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986–1995\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003ctd\u003eEngine Serial A635178-F600999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e340 (7.4L)\u003c\/td\u003e\n\u003ctd\u003e340\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1981–1992\u003c\/td\u003e\n\u003ctd\u003e57-74271Q\u003c\/td\u003e\n\u003ctd\u003eEngine Serial 5889914-D715493\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e2001, 2001B, 2001AG, 2001BG\u003c\/td\u003e\n\u003ctd\u003e17-20\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e966903\u003c\/td\u003e\n\u003ctd\u003eDiesel engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e2002, 2002B, 2002D, 2002AG, 2002BG\u003c\/td\u003e\n\u003ctd\u003e20-25\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e966903\u003c\/td\u003e\n\u003ctd\u003eDiesel engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e2003, 2003B, 2003D, 2003AG, 2003BG, 2003T, 2003TB\u003c\/td\u003e\n\u003ctd\u003e25-30\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e966903\u003c\/td\u003e\n\u003ctd\u003eDiesel engines, including SOLAS versions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003eMD17C\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e966903\u003c\/td\u003e\n\u003ctd\u003e2001 Alt application\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\u003eV-Belt\u003c\/dd\u003e\n\u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eEngine Accessory Drive\u003c\/dd\u003e\n\u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003eLength: 863-891mm (34-35.125\"), Width: 9.5-11.5mm (3\/8\"-29\/64\")\u003c\/dd\u003e\n\u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eAlternator, Water Pump, Power Steering (varies by engine)\u003c\/dd\u003e\n\u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003eRubber\u003c\/dd\u003e\n\u003cdt\u003eBelt Type\u003c\/dt\u003e\n\u003cdd\u003eV-Belt\u003c\/dd\u003e\n\u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 year against manufacturing defects\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\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1\u003c\/span\u003e x Drive Belt (57-74271Q\/966903)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect the negative battery terminal to prevent accidental starts.\u003c\/li\u003e\n\u003cli\u003eLocate the drive belt routing diagram, usually on a sticker in the engine bay. If not present, sketch the current belt's path.\u003c\/li\u003e\n\u003cli\u003eFind the belt tensioner pulley and use the appropriate tool (e.g., a breaker bar or wrench) to release the tension.\u003c\/li\u003e\n\u003cli\u003eCarefully slide the old, worn belt off the pulleys.\u003c\/li\u003e\n\u003cli\u003eInspect all pulleys for wobble, damage, or seizure. Spin them by hand to ensure they move freely and quietly.\u003c\/li\u003e\n\u003cli\u003eRoute the new belt according to the diagram, starting with the crankshaft pulley and finishing with an easy-to-reach smooth pulley.\u003c\/li\u003e\n\u003cli\u003eEnsure the ribbed side of the belt is seated correctly in all grooved pulleys.\u003c\/li\u003e\n\u003cli\u003eSlowly release the tensioner, allowing it to apply the correct tension to the new belt.\u003c\/li\u003e\n\u003cli\u003eDouble-check the entire belt path to confirm it is properly aligned on every pulley.\u003c\/li\u003e\n\u003cli\u003eReconnect the battery, start the engine, and listen for unusual noises while visually ensuring the belt tracks correctly.\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 this belt is the right one for my engine?\u003c\/summary\u003e\n\u003cp\u003eFirst, cross-reference your engine's original part number with our Part Number Matrix. Second, check your engine model, HP, and year in the Engine \u0026amp; Model Compatibility table. For MerCruiser engines, verifying the serial number is the most reliable method. If you're still unsure, measure your old belt and compare it to the dimensions provided: Length: 863-891mm (34-35.125\"), Width: 9.5-11.5mm (3\/8\"-29\/64\").\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are the signs of a failing drive belt?\u003c\/summary\u003e\n\u003cp\u003eCommon symptoms include loud squealing or chirping noises from the engine, visible cracks or fraying on the belt's surface, a glazed or shiny appearance, or pieces of rubber missing. A failing belt can also cause poor performance of accessories like the alternator (dimming lights) or water pump (overheating).\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow often should this belt be replaced?\u003c\/summary\u003e\n\u003cp\u003eWhile there is no universal schedule, we recommend inspecting the drive belt annually for signs of wear. As a general preventative measure, replacement every 3 to 5 years is a good practice, depending on engine hours and operating conditions. Always follow your engine manufacturer's specific service recommendations if available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this belt different from the original OEM part?\u003c\/summary\u003e\n\u003cp\u003eThis is an aftermarket part designed to function as a direct replacement for the original. It is manufactured to meet or exceed OEM specifications for fit, durability, and performance, offering a reliable and cost-effective alternative without compromising on quality.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat happens if I install the wrong size belt?\u003c\/summary\u003e\n\u003cp\u003eInstalling an incorrect belt can lead to serious issues. A belt that is too long will slip, causing improper accessory function and generating excess heat that leads to premature failure. A belt that is too short will be difficult or impossible to install and will place excessive strain on the bearings of your alternator, water pump, and other pulleys, leading to their rapid failure.\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). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\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 5–15 days. Standard shipping is free; expedited options 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\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our 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 images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended for safety and 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 tested for real-world conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723788456251,"sku":"24BL093","price":24.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/24BL093_1.jpg?v=1763031787","url":"https:\/\/seasierra.com\/products\/drive-belt-fits-mercruiser-volvo-penta-17-350hp-replaces-57-74271q-966903","provider":"SeaSierra","version":"1.0","type":"link"}