{"product_id":"sierra-18-8219-transom-seal-kit-for-mercruiser-alpha-one-gen-ii-bravo-i-ii-iii-replaces-30-803099t1-30-803100t1","title":"Sierra Transom Seal Kit 18-8219 for MerCruiser Sterndrive Transom Bellows Assembly","description":"\u003cp\u003eThe Sierra Transom Seal Kit, part number 18-8219, is a replacement seal kit used to reseal the transom assembly on MerCruiser sterndrive bellows installations. Transom seals are a critical barrier between the outdrive and the boat's transom, keeping water out of the bilge while allowing the drive shaft, shift cable, and exhaust components to pass through the transom plate. Over time these seals dry out, crack, or lose their sealing compression from heat cycling and constant exposure to water and fuel vapor, which can allow water intrusion at the transom. This kit provides the seal components needed to service that connection and restore a watertight fit during transom assembly maintenance or bellows replacement work.\u003c\/p\u003e\u003cp\u003eSierra manufactures this kit to the dimensions and specifications of the original transom seal, so it installs using the same fasteners and mounting points as the assembly it replaces. It is sold as a compact, packaged kit ready for installation as part of a routine sterndrive service.\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 18-8219\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Transom Seal Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.73 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282305307\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eUsed in MerCruiser sterndrive transom bellows assemblies.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eNo OEM cross-reference numbers are published for this kit.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-8219 transom seal kit used for?\u003c\/strong\u003e The Sierra 18-8219 is a transom seal kit used to reseal the transom assembly on a sterndrive boat, sealing the opening where the drive shaft and related components pass through the transom plate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-8219 kit fit MerCruiser sterndrives?\u003c\/strong\u003e Yes, this Sierra transom seal kit is designed for use in MerCruiser sterndrive transom bellows assemblies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the transom seal kit weigh?\u003c\/strong\u003e The Sierra 18-8219 transom seal kit weighs 4.73 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-8219 kit as packaged?\u003c\/strong\u003e The kit measures 0.39 x 0.39 x 0.39 inches as listed by the manufacturer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre there OEM cross-reference numbers for part 18-8219?\u003c\/strong\u003e No OEM cross-reference or replaces numbers are published for the Sierra 18-8219 transom seal kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-8219 an original Sierra part or aftermarket?\u003c\/strong\u003e It is a genuine Sierra part, manufacturer part number 18-8219, sold as a dedicated transom seal kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should a transom seal be replaced?\u003c\/strong\u003e A transom seal should be replaced when it shows cracking, hardening, or loss of compression, since a worn seal can allow water to enter the boat at the transom during sterndrive bellows service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-8219 kit a DIY job or does it need a mechanic?\u003c\/strong\u003e Installing the Sierra 18-8219 transom seal kit is typically done as part of a broader sterndrive bellows service, and while experienced boat owners can perform it, it involves working at the transom opening where a watertight seal is critical.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-8219 kit?\u003c\/strong\u003e The Sierra 18-8219 transom seal kit carries UPC 808282305307.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this seal kit be used on any boat transom?\u003c\/strong\u003e The Sierra 18-8219 is intended for MerCruiser sterndrive transom bellows assemblies rather than as a universal transom seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988433514715,"sku":"SIE-18-8219","price":279.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-8219__78437.1729015195.500.750.jpg?v=1785188955","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-8219-transom-seal-kit-for-mercruiser-alpha-one-gen-ii-bravo-i-ii-iii-replaces-30-803099t1-30-803100t1","provider":"Good Vibes Marina","version":"1.0","type":"link"}