{"product_id":"sierra-18-15370-v-belt-37-effective-length-replaces-mercruiser-57-65607-mallory-9-55005","title":"Sierra V-Belt 18-15370 - 37 Inch Belt for MerCruiser 120 HP 2.5L 153 CID Stern Drive","description":"\u003cp\u003eThe Sierra 18-15370 is a premium aftermarket V-belt engineered to OEM quality standards for correct fit, form, and function on applicable MerCruiser stern drive engines. This belt measures 37 inches in effective length with a 29\/64 inch (11.5mm) top width, sized to drive accessories such as the sea water pump pulley on covered applications.\u003c\/p\u003e\u003cp\u003eConstruction combines a synthetic fiber fabric cover, special polyester cord, and a polychloroprene rubber body. The high-strength synthetic cords resist shock loading and hold low-stretch properties for uniform performance over the belt's service life, while the rubber compound section provides smooth, even transfer of load forces to the cords. The belt also offers oil resistance and temperature stability, both standard features across the Sierra belt line. It is finished in white and weighs 0.22 pounds.\u003c\/p\u003e\u003cp\u003eThe 18-15370 is intended for MerCruiser 120 HP 2.5L 153 CID, 4-cylinder engines built 1982-89 (engine serial number range 6229718 - C853255), for use with a cast aluminum sea water pump pulley. It cross-references directly to commonly searched Mercury Marine and Mallory belt numbers, making it a straightforward replacement when the original belt has cracked, glazed, or stretched.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-15370\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e V-Belt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective Length:\u003c\/strong\u003e 37 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Width:\u003c\/strong\u003e 29\/64 inch (11.5 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber (polychloroprene rubber body with synthetic fiber fabric cover and polyester cord)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.22 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Serial Number Range:\u003c\/strong\u003e 6229718 - C853255\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Pulley:\u003c\/strong\u003e Cast aluminum sea water pump pulley\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 57-65607T, 9-55005, 57-65607, 57-65607Q\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMerCruiser 120 HP, 2.5L, 153 CID, 4 cylinder, 1982-89 (engine serial number range 6229718 - C853255)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e57-65607T\u003c\/li\u003e\n\u003cli\u003e9-55005\u003c\/li\u003e\n\u003cli\u003e57-65607\u003c\/li\u003e\n\u003cli\u003e57-65607Q\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the effective length and width of the Sierra 18-15370 V-belt?\u003c\/strong\u003e The Sierra 18-15370 has a 37 inch effective length and a 29\/64 inch (11.5mm) top width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines does the Sierra 18-15370 V-belt fit?\u003c\/strong\u003e This belt fits MerCruiser 120 HP 2.5L 153 CID, 4-cylinder engines built 1982-89, within engine serial number range 6229718 - C853255.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-15370 the same as the Mercury Marine 57-65607 belt?\u003c\/strong\u003e Yes, the Sierra 18-15370 cross-references to Mercury Marine 57-65607T, 57-65607, and 57-65607Q, as well as Mallory 9-55005, so it functions as a direct equivalent.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-15370 V-belt made of?\u003c\/strong\u003e It is built with a polychloroprene rubber body, a synthetic fiber fabric cover, and special polyester cord for durability and oil resistance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-15370 V-belt?\u003c\/strong\u003e The 18-15370 belt is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-15370 V-belt weigh?\u003c\/strong\u003e It weighs 0.22 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-15370 belt require a specific pulley?\u003c\/strong\u003e The 18-15370 is designed for use with a cast aluminum sea water pump pulley on its covered MerCruiser application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-15370 belt resistant to heat and oil exposure?\u003c\/strong\u003e Yes, oil resistance and temperature stability are standard features of this Sierra belt, helping it hold up in the engine bay environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when ordering the Sierra 18-15370?\u003c\/strong\u003e Ordering the 18-15370 gets you one Sierra V-belt sized for the specified MerCruiser 120 HP 2.5L application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does the 18-15370 differ from the Sierra 18-15400 belt?\u003c\/strong\u003e The 18-15400 and 18-15370 are separate Sierra V-belt part numbers listed for overlapping MerCruiser 120 HP 2.5L applications; confirm engine serial number range 6229718 - C853255 and pulley type before ordering to get the correct one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy do the belt's low-stretch properties matter?\u003c\/strong\u003e The 18-15370's high-strength synthetic cords keep stretch low, which assures uniform performance and reduces slippage over the belt's service life.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988088434907,"sku":"SIE-18-15370","price":49.33,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-15370_lg__69680.1722488909.500.750.jpg?v=1785189133","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-15370-v-belt-37-effective-length-replaces-mercruiser-57-65607-mallory-9-55005","provider":"Good Vibes Marina","version":"1.0","type":"link"}