{"product_id":"u-joint-bellows-60932a4-for-mercruiser-alpha-one-mc-i-r-mr-tr-trs-sterndrives-1972-1990-sierra-18-2751","title":"Sierra 18-2751 U-Joint Bellows, Medium, Replaces Mercury Marine 60932A4, Fits Mercruiser TR\/TRS Drives","description":"\u003cp\u003eThe Sierra 18-2751 is a medium-size U-joint bellows built to seal the connection between the transom assembly and the drive unit on Mercruiser TR\/TRS stern drives, S\/N 3377316 and up. This bellows keeps water out of the u-joint and gimbal area while allowing the drive to pivot and steer, protecting the u-joint, gimbal bearing, and driveshaft from water intrusion and corrosion. It is a direct equivalent for the Mercury Marine OEM part 60932A4, so it installs using the same mounting points and hardware as the original bellows it replaces. The product ships as a single U-joint bellows and includes a clamp for installation. Sierra manufactures this part (produced by Teleflex Marine) to a round profile matching the original equipment shape, and it is sized specifically for the medium application used on TR\/TRS drives rather than the larger or smaller bellows used on other Mercruiser drive generations. Because stern drive bellows are wear items exposed to constant flexing, heat, and saltwater or freshwater immersion, replacing a cracked, torn, or hardened bellows before it fails is the standard way to prevent water from reaching the gimbal bearing, u-joints, and ultimately the engine. This bellows is sold under part number 18-2751 and should be matched to your drive's serial number range before ordering.\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 18-2751\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e U-Joint Bellows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e Medium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e U-Joint Bellows, Clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.37 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999312921\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999312921\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Bellows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Teleflex Marine\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser TR\/TRS drives, S\/N 3377316 and up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 60932A4\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2751 U-joint bellows fit?\u003c\/strong\u003e The 18-2751 is sized for Mercruiser TR\/TRS drives, serial number 3377316 and up, sealing the u-joint and gimbal area between the transom assembly and the drive unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2751 a direct replacement for Mercury Marine 60932A4?\u003c\/strong\u003e Yes, Sierra part 18-2751 replaces Mercury Marine OEM part 60932A4 and uses the same mounting configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the U-joint bellows weigh?\u003c\/strong\u003e The Sierra 18-2751 U-joint bellows weighs 1.37 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size bellows is this?\u003c\/strong\u003e This is the medium-size U-joint bellows in Sierra's 18-2751 lineup, matched specifically to TR\/TRS drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with part number 18-2751?\u003c\/strong\u003e The package includes one U-joint bellows and a clamp for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the 18-2751 bellows?\u003c\/strong\u003e It has a round shape, matching the profile of the original equipment bellows on TR\/TRS drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWho manufactures the 18-2751 bellows?\u003c\/strong\u003e It is a Sierra-branded part, manufactured by Teleflex Marine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a stern drive u-joint bellows need to be replaced?\u003c\/strong\u003e The bellows on a TR\/TRS drive flexes constantly and is exposed to water, so it cracks or hardens over time; a failed bellows lets water reach the u-joints and gimbal bearing, which is why Sierra offers 18-2751 as a preventive replacement part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2751 fit all Mercruiser drives?\u003c\/strong\u003e No, this specific part number is matched to Mercruiser TR\/TRS drives with serial number 3377316 and up; other Mercruiser drive generations use different Sierra bellows part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2751?\u003c\/strong\u003e The UPC for the Sierra 18-2751 U-joint bellows is 030999312921.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-2751 is a genuine Sierra-branded U-joint bellows, manufactured by Teleflex Marine, not a generic aftermarket substitute.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988111470811,"sku":"SIE-18-2751","price":55.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__89356.1770739270.500.750.jpg?v=1785188911","url":"https:\/\/www.goodvibesmarina.com\/products\/u-joint-bellows-60932a4-for-mercruiser-alpha-one-mc-i-r-mr-tr-trs-sterndrives-1972-1990-sierra-18-2751","provider":"Good Vibes Marina","version":"1.0","type":"link"}