{"product_id":"sierra-marine-v-belt-18-15470","title":"Sierra Marine V-Belt 18-15470 | 47 in. \/ 119.4 cm × 29\/64 in. \/ 11.5 mm","description":"\u003ch2\u003eSierra Marine V-Belt 18-15470\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 18-15470 (Sierra)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Cogged Marine V-Belt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective Length:\u003c\/strong\u003e 47 in. \/ 119.4 cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Width:\u003c\/strong\u003e 29\/64 in. \/ 11.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999566591\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe Sierra 18-15470 is a cogged marine V-belt for selected MerCruiser and OMC inboard and sterndrive accessory-drive systems. High-strength synthetic cords resist stretching and shock-load failure. The precision-moulded cog profile improves flexibility and allows greater airflow around the belt. Rubber sidewalls provide positive, non-slip pulley contact.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cp\u003eVerified MerCruiser GM 454 CID \/ 7.4 L V8 applications:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser 330 — 1982–1987\u003c\/li\u003e\n\u003cli\u003eMerCruiser 340 \/ 7.4L MIE — 1981–1992\u003c\/li\u003e\n\u003cli\u003eMerCruiser 7.4L Bravo — 1988–1991\u003c\/li\u003e\n\u003cli\u003eMerCruiser 7.4L MIE with Hurth Transmission — 1989–1992\u003c\/li\u003e\n\u003cli\u003eMerCruiser 454 MAG Alpha — 1986–1988\u003c\/li\u003e\n\u003cli\u003eMerCruiser 454 MAG Bravo — 1988–1992\u003c\/li\u003e\n\u003cli\u003eOMC inboard\/sterndrive applications specifying OEM belt 0509309\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlways confirm engine model, serial number, existing OEM belt number, and accessory-drive configuration before ordering. Engines with the same displacement can use different belt lengths depending on pulley arrangement, alternator, and production year. Matching the OEM part number and belt width is more reliable than selecting by displacement alone.\u003c\/p\u003e\n\n\u003ch2\u003eCross-Reference Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSierra:\u003c\/strong\u003e 18-15470\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupplier\/Catalogue Reference:\u003c\/strong\u003e 47-15470\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury \/ MerCruiser:\u003c\/strong\u003e 57-78200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury \/ MerCruiser:\u003c\/strong\u003e 57-78200A1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury Quicksilver:\u003c\/strong\u003e 57-78200Q1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOMC:\u003c\/strong\u003e 0509309\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRedline:\u003c\/strong\u003e RL15470\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eMercury documents 57-78200A1 as superseded by 57-78200Q1.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Replace This Belt\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCracks visible between the cogs\u003c\/li\u003e\n\u003cli\u003eFrayed or worn edges\u003c\/li\u003e\n\u003cli\u003eGlazed, hardened, or oil-contaminated surface\u003c\/li\u003e\n\u003cli\u003eIncreased belt dust around pulleys\u003c\/li\u003e\n\u003cli\u003eSlipping, squealing, or loss of tension\u003c\/li\u003e\n\u003cli\u003eBelt has stretched beyond adjustment range\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInspect pulley grooves for wear, corrosion, and alignment before installing\u003c\/li\u003e\n\u003cli\u003eConfirm correct belt routing for your engine configuration\u003c\/li\u003e\n\u003cli\u003eDo not force the belt over pulley flanges with sharp tools — this can damage internal cords\u003c\/li\u003e\n\u003cli\u003eSet belt tension to the engine manufacturer's specification\u003c\/li\u003e\n\u003cli\u003eRotate the assembly by hand to confirm full pulley seating\u003c\/li\u003e\n\u003cli\u003eRecheck tension after initial operation\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 go-to for pre-season service and routine maintenance on MerCruiser and OMC inboard and sterndrive boats. If your engine specifies OEM references 57-78200, 57-78200A1, 57-78200Q1, or OMC 0509309, this is the direct replacement. It's also a practical onboard spare for extended cruising — a belt failure on these big-block engines can simultaneously disable raw water cooling and battery charging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon issue:\u003c\/strong\u003e Belt length alone is not enough to confirm fitment. Customers frequently order by engine displacement without checking the pulley arrangement or OEM number, which leads to slipping, overheating, or premature accessory-drive wear. Always match the original OEM belt number and verify the belt width and pulley configuration before ordering.\u003c\/p\u003e\n\u003cp\u003eFor a complete cooling system service, pair this belt with a raw water pump impeller. 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.\u003c\/p\u003e\n\u003cp\u003eNeed a different belt size? Browse other sizes in the Sierra V-Belt series: \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, and \u003ca href=\"\/products\/11077659721764\"\u003eSierra V-Belt 47-15550\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eShop all \u003ca href=\"\/collections\/engine-parts-maintenance\"\u003eEngine Parts \u0026amp; Maintenance\u003c\/a\u003e or browse \u003ca href=\"\/collections\/propulsion-powertrain\"\u003ePropulsion \u0026amp; Powertrain\u003c\/a\u003e for related components.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51037541236772,"sku":"47-15470","price":71.39,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-15128_082fdfa2-f965-43de-b74a-46b1ee3008bb.jpg?v=1783568592","url":"https:\/\/marisolmarine.com\/products\/sierra-marine-v-belt-18-15470","provider":"Marisol Marine Company","version":"1.0","type":"link"}