{"product_id":"sierra-18-21005k-seal-gimbal-bearing-kit-for-mercruiser-bravo-alpha-one-gen-ii-1998-up-replaces-30-862540a3","title":"Sierra 18-21005K Seal \u0026 Bearing Kit for Mercruiser Gimbal Bearing","description":"\u003cp\u003eThe Sierra 18-21005K Seal \u0026amp; Bearing Kit is a replacement ball bearing and seal set built for Mercruiser gimbal bearing applications. It is designed as a direct-fit repair kit for boat owners and marine technicians who need to renew a worn or leaking gimbal bearing assembly without hunting down individual components separately. The kit pairs a metal ball bearing with matched seals so the bearing bore stays properly sealed against water intrusion, one of the most common causes of premature gimbal bearing failure on sterndrive boats.\u003c\/p\u003e\u003cp\u003eConstruction is metal for durability in the demanding marine environment, and the bearing is lubricated with grease to reduce friction and wear during operation. Sierra engineers its parts to meet or exceed the specification of the original equipment they replace, and the company supplies OEM engine manufacturers and boat builders with parts on a daily basis, so buyers can expect consistent fit and performance from the 18-21005K kit. Each kit is packaged as a complete, ready-to-install unit containing one bearing and its associated seal components.\u003c\/p\u003e\u003cp\u003eThis kit is intended for gimbal bearing service on Mercruiser sterndrive setups. Installers should confirm the bearing bore and shaft dimensions on their specific gimbal housing match this kit before ordering, as gimbal bearing kits are sized to a particular housing and drive combination.\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 18-21005K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Seal \u0026amp; Bearing Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercruiser Gimbal Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Type:\u003c\/strong\u003e Ball Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Lubricant:\u003c\/strong\u003e Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 4.5 x 2.75 x 5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.51 pounds\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 808282187309\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-21005K Seal \u0026amp; Bearing Kit?\u003c\/strong\u003e The Sierra 18-21005K kit includes one ball bearing and its matched seal components, packaged as a single ready-to-install seal and bearing kit for a package quantity of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is this kit used for?\u003c\/strong\u003e The 18-21005K is a seal and bearing kit for Mercruiser gimbal bearing service, replacing the bearing and seals in a gimbal bearing housing on a sterndrive boat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-21005K made from?\u003c\/strong\u003e It is made of metal, with a ball bearing design lubricated with grease for smooth operation in marine use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-21005K Seal \u0026amp; Bearing Kit?\u003c\/strong\u003e The kit measures 4.5 x 2.75 x 5 inches and weighs 1.51 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-21005K a genuine Sierra part or aftermarket?\u003c\/strong\u003e 18-21005K is a Sierra-branded seal and bearing kit engineered to meet or exceed the specification of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of bearing does this kit use?\u003c\/strong\u003e This kit uses a ball bearing, designated bearing number 18-21005K, matched with seals for the gimbal bearing bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat lubricant should be used with the 18-21005K bearing?\u003c\/strong\u003e The bearing in the 18-21005K kit is compatible with standard marine grease lubricant.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-21005K manufactured?\u003c\/strong\u003e The country of origin for the 18-21005K Seal \u0026amp; Bearing Kit is China.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many bearings come in one 18-21005K kit?\u003c\/strong\u003e Each 18-21005K kit has a package quantity of 1, containing a single seal and bearing set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-21005K require special tools to install?\u003c\/strong\u003e The kit is a standard press-fit seal and bearing replacement for a gimbal bearing housing; installers should verify bore and shaft dimensions match their gimbal housing before installing the 18-21005K.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988091777243,"sku":"SIE-18-21005K","price":93.31,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-21005K__15377.1737884803.500.750.jpg?v=1785188518","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-21005k-seal-gimbal-bearing-kit-for-mercruiser-bravo-alpha-one-gen-ii-1998-up-replaces-30-862540a3","provider":"Good Vibes Marina","version":"1.0","type":"link"}