{"product_id":"sierra-v-belt-47-15550-marine-inboard-sterndrive","title":"Sierra V-Belt 47-15550 — Marine Inboard Sterndrive","description":"\u003cp\u003eThe Sierra 18-15550 is a cogged marine V-belt designed for selected Mercury MerCruiser big-block inboard and sterndrive accessory-drive systems. High-strength synthetic cords resist stretching and shock loading, while the precision-moulded cog profile improves flexibility and allows cooling airflow around the belt. Its specially compounded rubber construction distributes drive loads evenly and maintains positive contact with the pulley grooves.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMarine replacement cogged V-belt\u003c\/li\u003e\n\u003cli\u003eEffective length: \u003cstrong\u003e55 inches \/ 139.7 cm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eTop width: \u003cstrong\u003e29\/64 inch \/ 11.5 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh-strength, low-stretch synthetic cords\u003c\/li\u003e\n\u003cli\u003ePrecision-moulded cogs improve flexibility\u003c\/li\u003e\n\u003cli\u003eOpen cog profile helps control heat buildup\u003c\/li\u003e\n\u003cli\u003eRubber edges provide positive pulley contact\u003c\/li\u003e\n\u003cli\u003eSynthetic-rubber W-profile construction\u003c\/li\u003e\n\u003cli\u003eSupplied as one replacement belt\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\n\u003cp\u003eDesigned for selected Mercury MerCruiser 7.4L\/454 cubic-inch GM V8 applications, including certain 330 GM 454 engines from 1982–1987 and 454 MAG Alpha applications from 1986–1989. Additional references associate it with selected 454 MAG Bravo and 7.4L Bravo installations through the early 1990s.\u003c\/p\u003e\n\n\u003ch2\u003eSerial Number Fitment Notice\u003c\/h2\u003e\n\u003cp\u003eConfirm the engine model, serial-number range, original belt number and complete accessory-drive arrangement before ordering. MerCruiser 454 and 7.4L engines may use different belts depending on the power-steering system, pulley layout, drive model and production year.\u003c\/p\u003e\n\n\u003ch2\u003eWhen This Part Needs Replacement\u003c\/h2\u003e\n\u003cp\u003eReplace the belt when it develops cracking, glazing, frayed edges, missing cog material, oil contamination or excessive stretching. Squealing, slipping, repeated loss of tension or a belt riding unusually low in the pulley groove can also indicate belt wear, pulley wear or incorrect fitment.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eInspect all pulleys for corrosion, contamination, wear and misalignment before installing the replacement belt. Do not force the belt over the pulley flanges. Set the tension according to the engine manufacturer's specification, rotate the drive by hand to confirm correct seating and recheck the tension after the initial operating period.\u003c\/p\u003e\n\n\u003ch2\u003eAlternate \/ Superseded Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSierra part number: \u003cstrong\u003e18-15550\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSupplier or catalogue reference: \u003cstrong\u003e47-15550\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMallory: \u003cstrong\u003e9-55000\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMercury MerCruiser: \u003cstrong\u003e57-13458\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMercury Quicksilver: \u003cstrong\u003e57-13458Q\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMercury MerCruiser: \u003cstrong\u003e57-13458T\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eUPC: \u003cstrong\u003e030999566744\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e This belt is the right choice for pre-season service and routine maintenance on MerCruiser 7.4L\/454 big-block inboard and sterndrive boats, particularly 330 GM 454 (1982–1987), 454 MAG Alpha (1986–1989) and 454 MAG Bravo\/7.4L Bravo installations through the early 1990s. If your engine specifies OEM belt numbers 57-13458, 57-13458Q or 57-13458T, this is the direct replacement to have ready before launch. It also makes a practical onboard spare — a belt failure on a big-block can simultaneously take out raw water cooling, power steering and battery charging.\u003c\/p\u003e\n\u003cp\u003eThis belt is closely tied to the accessory and power-steering layout used on older MerCruiser big-block engines. Match the original belt number and pulley arrangement rather than ordering by engine displacement alone. Always verify the OEM belt number, drive model and production year before ordering.\u003c\/p\u003e\n\u003cp\u003eFor a complete cooling system service, pair this belt with a raw water pump impeller replacement. See the \u003ca href=\"\/products\/8131470458916\"\u003ePCM Impeller Kit RP061017\u003c\/a\u003e and \u003ca href=\"\/products\/8131470491684\"\u003ePCM \/ Crusader RP061022 Raw Water Pump Impeller\u003c\/a\u003e for compatible options. Need a different belt size? Browse the \u003ca href=\"\/products\/11077659328548\"\u003eSierra V-Belt 47-15400\u003c\/a\u003e, \u003ca href=\"\/products\/11077659361316\"\u003eSierra V-Belt 47-15410\u003c\/a\u003e, \u003ca href=\"\/products\/11077659426852\"\u003eSierra V-Belt 47-15440\u003c\/a\u003e, \u003ca href=\"\/products\/11077659459620\"\u003eSierra V-Belt 47-15450\u003c\/a\u003e, \u003ca href=\"\/products\/11077659492388\"\u003eSierra V-Belt 47-15455\u003c\/a\u003e, \u003ca href=\"\/products\/11077659557924\"\u003eSierra V-Belt 47-15460\u003c\/a\u003e, \u003ca href=\"\/products\/11077659590692\"\u003eSierra V-Belt 47-15470\u003c\/a\u003e, \u003ca href=\"\/products\/11077659623460\"\u003eSierra V-Belt 47-15480\u003c\/a\u003e, and \u003ca href=\"\/products\/11077659656228\"\u003eSierra V-Belt 47-15520\u003c\/a\u003e for other sizes in the same series.\u003c\/p\u003e\n\u003cp\u003eShop all \u003ca href=\"\/collections\/475069022244\"\u003eEngine Parts \u0026amp; Maintenance\u003c\/a\u003e or browse \u003ca href=\"\/collections\/475200946212\"\u003ePropulsion \u0026amp; Powertrain\u003c\/a\u003e for related components.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51037541367844,"sku":"47-15550","price":43.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-15128_9b666b72-6b49-46b6-a585-2d2f2e685b5f.jpg?v=1783568596","url":"https:\/\/marisolmarine.com\/products\/sierra-v-belt-47-15550-marine-inboard-sterndrive","provider":"Marisol Marine Company","version":"1.0","type":"link"}