{"product_id":"sierra-18-4220-thrust-hub-for-mercury-mariner-outboard-mercruiser-alpha-one-gen-1-sterndrive-replaces-oem-79448","title":"Sierra 18-4220 Marine Thrust Washer for Mercury\/Mariner Outboard Motors, Replaces 13171, 77987, White","description":"\u003cp\u003eThe Sierra 18-4220 is a marine thrust washer engineered for Mercury\/Mariner outboard motors, with application in V-6 outboards and Mercruiser sterndrives. Machined from alloy steel with a glossy white finish, this washer is built to meet or exceed original equipment quality standards, providing the precise thrust bearing surface needed to support proper propeller shaft alignment and load distribution in the lower unit. Thrust washers like the 18-4220 sit against the propeller shaft to absorb axial thrust loads generated during operation, protecting the gearcase from wear and helping maintain correct shaft positioning. Using a properly sized, quality thrust washer during a lower unit rebuild or propeller shaft service helps prevent premature wear to surrounding gearcase components. The Sierra 18-4220 is sold as a single piece and is dimensioned at 0.39 x 0.39 x 0.39 inches, making it a compact but critical component in the lower unit assembly. It is compatible with Mercury\/Mariner outboard motors and Mercruiser sterndrives using the OEM numbers listed below, giving buyers a reliable aftermarket equivalent for repair or rebuild work.\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 18-4220\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thrust Washer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined, Glossy\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 0.53 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Marine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999317674\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury\/Mariner Outboard Motors\u003c\/li\u003e\n\u003cli\u003eV-6 Outboards and Mercruiser Sterndrives\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e13171\u003c\/li\u003e\n\u003cli\u003e77987\u003c\/li\u003e\n\u003cli\u003e12-835467-1\u003c\/li\u003e\n\u003cli\u003eRO96116\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4220 used for?\u003c\/strong\u003e The Sierra 18-4220 is a marine thrust washer that sits against the propeller shaft in the lower unit to absorb axial thrust loads and support correct shaft alignment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-4220 fit Mercury outboards?\u003c\/strong\u003e Yes, the Sierra 18-4220 thrust washer is designed for Mercury\/Mariner outboard motors as well as V-6 outboards and Mercruiser sterndrives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-4220 replace?\u003c\/strong\u003e The Sierra 18-4220 replaces Mercury\/Mercruiser OEM numbers 13171, 77987, 12-835467-1, and Pleasurecraft RO96116.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this an OEM or aftermarket part?\u003c\/strong\u003e The Sierra 18-4220 is an aftermarket thrust washer manufactured to meet or exceed original equipment quality standards for the Mercury\/Mercruiser OEM numbers it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-4220 thrust washer made from?\u003c\/strong\u003e It is made from alloy steel with a machined, glossy finish in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the Sierra 18-4220 thrust washer?\u003c\/strong\u003e The 18-4220 measures 0.39 x 0.39 x 0.39 inches and weighs 0.53 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many washers come in one order of the 18-4220?\u003c\/strong\u003e Each order of the Sierra 18-4220 includes one thrust washer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-4220 compatible with Mercruiser sterndrives?\u003c\/strong\u003e Yes, the Sierra 18-4220 is compatible with V-6 outboards and Mercruiser sterndrives in addition to Mercury\/Mariner outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace a thrust washer like the 18-4220?\u003c\/strong\u003e A thrust washer is typically replaced during a lower unit rebuild or propeller shaft service, especially if the existing washer shows wear from absorbing axial thrust loads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-4220 have a specific color or finish?\u003c\/strong\u003e The Sierra 18-4220 has a white, glossy machined finish on its alloy steel construction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Pleasurecraft equivalent of the Sierra 18-4220?\u003c\/strong\u003e The Sierra 18-4220 is equivalent to Pleasurecraft OEM number RO96116.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988171829467,"sku":"SIE-18-4220","price":31.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4220_lg__80296.1558126570.500.750.jpg?v=1785188548","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-4220-thrust-hub-for-mercury-mariner-outboard-mercruiser-alpha-one-gen-1-sterndrive-replaces-oem-79448","provider":"Good Vibes Marina","version":"1.0","type":"link"}