{"product_id":"sierra-18-2771-bellows-kit-for-omc-cobra-without-cone-clutch-replaces-oem-3854270-u-joint-exhaust-bellows-gasket-set-clamp","title":"Sierra 18-2771 Bellows Kit, OEM 3854270 Replacement for OMC Cobra Sterndrive Without Cone Clutch","description":"\u003cp\u003eThe Sierra 18-2771 Bellows Kit is a complete replacement bellows and gasket package built for OMC Cobra sterndrives without a cone clutch. Bellows are one of the most critical wear items on a sterndrive: they seal the connection between the transom and the outdrive, keeping water out of the boat and out of the drive's u-joint and exhaust passages while allowing the drive to steer and tilt. Over time the rubber in these bellows hardens and cracks from heat, fuel, and UV exposure, which is the leading cause of water intrusion and corrosion damage in sterndrive boats.\u003c\/p\u003e\u003cp\u003eThis kit bundles the components needed to reseal the drive in one job rather than sourcing each bellows and gasket separately: an exhaust bellows, a u-joint bellows, and an outdrive gasket set. Sierra manufactures its bellows and gasket products to meet or exceed the original equipment they replace, so the fit and sealing performance match what the OMC Cobra drive was designed around. Installing all three components together at the same time is the standard practice for this job, since they wear out on a similar schedule and the outdrive typically has to come off the boat to access any one of them.\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 18-2771\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Bellows Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e OMC Cobra without cone clutch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Exhaust Bellows, U-Joint Bellows, Outdrive Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 3854270\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.69 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 8.75 x 9.75 x 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282100896\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC Cobra sterndrive without cone clutch\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3854270\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2771 Bellows Kit fit?\u003c\/strong\u003e This kit is built for the OMC Cobra sterndrive without a cone clutch. It is not a universal bellows kit, so confirm your drive is the non-cone-clutch Cobra configuration before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this kit replace?\u003c\/strong\u003e The Sierra 18-2771 kit replaces OEM number 3854270 on the OMC Cobra sterndrive without cone clutch.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-2771 bellows kit?\u003c\/strong\u003e The kit contains an exhaust bellows, a u-joint bellows, and an outdrive gasket set, giving you the parts needed to reseal the drive in one job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2771 Bellows Kit weigh?\u003c\/strong\u003e The complete kit weighs 3.69 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the packaged kit?\u003c\/strong\u003e The Sierra 18-2771 Bellows Kit measures 8.75 x 9.75 x 8 inches as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy do sterndrive bellows need to be replaced?\u003c\/strong\u003e Bellows are rubber seals that harden and crack over time from heat and UV exposure. Once cracked, they let water into the boat and drive, so the exhaust and u-joint bellows in the 18-2771 kit are typically replaced on a regular maintenance interval.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould the exhaust bellows, u-joint bellows, and gasket set be replaced together?\u003c\/strong\u003e Yes, and that is why they are bundled in the Sierra 18-2771 kit. Since the outdrive has to be removed to access these parts, replacing all three at once avoids doing the job twice.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2771 kit genuine OEM or aftermarket?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket kit engineered to meet or exceed the OEM part it replaces, OEM number 3854270, rather than an original OMC-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit work on a Cobra sterndrive with a cone clutch?\u003c\/strong\u003e No, the 18-2771 kit is specified for the OMC Cobra without a cone clutch. A cone-clutch equipped Cobra uses a different bellows kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of this bellows kit a DIY job?\u003c\/strong\u003e Installing the 18-2771 kit requires removing the outdrive from the transom to access the bellows and gasket set, which is a more involved job best suited to someone comfortable with sterndrive service or a marine technician.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988112650459,"sku":"SIE-18-2771","price":169.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2771_lg__86387.1558122548.500.750.jpg?v=1785188232","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2771-bellows-kit-for-omc-cobra-without-cone-clutch-replaces-oem-3854270-u-joint-exhaust-bellows-gasket-set-clamp","provider":"Good Vibes Marina","version":"1.0","type":"link"}