{"product_id":"sierra-18-18100-serpentine-belt-for-mercury-135-150-175-dfi-optimax-outboards-replaces-57-828507q4","title":"Sierra Serpentine Belt 18-18100, White, for Mercury V-135\/150 DFI (1998-up) and V-175 DFI (2001-up) Outboards","description":"\u003cp\u003eThe Sierra 18-18100 is a white serpentine belt built as a direct replacement for the accessory drive belt on Mercury V-135\/150 DFI (1998-up) and V-175 DFI (2001-up) outboard engines. Serpentine belts run the engine's accessory drive system, and a worn, cracked, or glazed belt can cause slipping, squealing, or a complete loss of accessory drive, so keeping this belt in good condition is important for reliable operation on the water. This Sierra-branded belt is sized to match the original equipment fitment for the V-135\/150 DFI and V-175 DFI engine applications, making it a straightforward swap for a boat owner or marine technician performing routine maintenance or replacing a failed belt.\u003c\/p\u003e\u003cp\u003eThe belt measures 13 inches long by 4 inches wide and is finished in white. It is packaged as a single belt (1 count) and ships at 0.26 pounds. Because it is a direct-fit replacement for the specified Mercury DFI outboard applications, no modification is required for installation. Keep a spare on hand for offshore or extended trips, since a snapped serpentine belt can leave an outboard without accessory drive function until it is replaced.\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 18-18100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Serpentine Belt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 13 inches L x 4 inches W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.26 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 belt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282200091\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury V-135\/150 DFI (1998-up)\u003c\/li\u003e\n\u003cli\u003eMercury V-175 DFI (2001-up)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMallory 9-55021\u003c\/li\u003e\n\u003cli\u003eMercury Marine 57-8285072\u003c\/li\u003e\n\u003cli\u003eMercury Marine 57-8285074\u003c\/li\u003e\n\u003cli\u003eMercury Marine 57-828507Q4\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-18100 serpentine belt fit?\u003c\/strong\u003e This belt fits Mercury V-135\/150 DFI outboards from 1998-up and Mercury V-175 DFI outboards from 2001-up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-18100 a direct OEM replacement?\u003c\/strong\u003e Yes, the 18-18100 is designed as a direct-fit replacement belt for the specified Mercury V-135\/150 DFI and V-175 DFI outboard applications, requiring no modification to install.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the 18-18100 serpentine belt?\u003c\/strong\u003e The belt measures 13 inches long by 4 inches wide.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-18100 belt?\u003c\/strong\u003e It is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-18100 serpentine belt weigh?\u003c\/strong\u003e The Sierra 18-18100 weighs 0.26 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-18100 cross-reference to?\u003c\/strong\u003e This belt interchanges with Mallory 9-55021 and Mercury Marine 57-8285072, 57-8285074, and 57-828507Q4.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many belts come in one order of the 18-18100?\u003c\/strong\u003e One order includes a single serpentine belt, sold individually.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-18100 belt fit a Mercury Sport Jet engine?\u003c\/strong\u003e The 18-18100 cross-references to Mercury Sport Jet belt numbers 57-8285074 and 57-828507Q4, so it is a match for those Sport Jet applications in addition to the V-135\/150 DFI and V-175 DFI outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the signs a serpentine belt like the 18-18100 needs to be replaced?\u003c\/strong\u003e Squealing, visible cracking or glazing on the belt surface, or slipping accessory drive components are common signs the belt should be replaced; the Sierra 18-18100 is sized to directly replace a worn original belt on the covered Mercury DFI engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-18100 an OEM or aftermarket belt?\u003c\/strong\u003e The 18-18100 is a Sierra-branded aftermarket belt manufactured to match the fit and function of the original equipment belt on the specified Mercury DFI outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-18100 require any additional hardware to install?\u003c\/strong\u003e No additional hardware is included or required; the 18-18100 is a single replacement belt sized for direct installation on the covered Mercury V-135\/150 DFI and V-175 DFI engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988088991963,"sku":"SIE-18-18100","price":58.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-18100_lg__71706.1558121974.500.750.jpg?v=1785188379","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-18100-serpentine-belt-for-mercury-135-150-175-dfi-optimax-outboards-replaces-57-828507q4","provider":"Good Vibes Marina","version":"1.0","type":"link"}