{"product_id":"sierra-18-2791-gearcase-seal-kit-replaces-omc-volvo-penta-987251-fits-3-0l-4-3l-5-0l-5-7l-7-4l-8-2l-sterndrives-1992-1995","title":"Sierra 18-2791 Lower Unit Seal Kit - Replaces OMC 3850597","description":"\u003cp\u003eThe Sierra 18-2791 Lower Unit Seal Kit provides the seals needed to service and reseal a marine outboard or sterndrive lower unit, helping prevent gear lube leaks and water intrusion into the gearcase. It is supplied as a complete kit so the necessary seals are on hand in a single part number rather than sourcing individual pieces separately. The kit is packaged as a single unit (Number of Items: 1) and is sold per piece. Country of origin is Taiwan, and the kit carries a limited warranty from Sierra.\u003c\/p\u003e\u003cp\u003eThis kit is a direct cross-reference to OEM part 3850597, making it straightforward to identify as the correct replacement when servicing a lower unit originally fitted with that OEM seal. Buyers replacing worn or hardened lower unit seals during a gearcase rebuild, prop shaft seal replacement, or routine maintenance can use this kit to restore a proper seal without needing to locate discontinued or harder-to-find original equipment parts.\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 18-2791\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 3850597\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282113049\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.27 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 10.88 x 8 x 1.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 8 x 1.75 x 10.87 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned as a lower unit seal kit for marine outboard\/sterndrive applications originally using OEM seal 3850597.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3850597\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2791 Lower Unit Seal Kit include?\u003c\/strong\u003e The 18-2791 kit includes the seals needed to reseal a marine lower unit, packaged as a single kit (Number of Items: 1) rather than individual loose seals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2791 kit replace?\u003c\/strong\u003e Sierra 18-2791 replaces OEM part 3850597, so it can be ordered as a direct substitute wherever that original seal is called for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2791 kit genuine Sierra or an aftermarket part?\u003c\/strong\u003e It is a genuine Sierra-branded part, sold under Sierra part number 18-2791, and functions as an aftermarket equivalent to the original OEM 3850597 seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2791 Lower Unit Seal Kit weigh?\u003c\/strong\u003e The kit weighs 0.27 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the 18-2791 seal kit?\u003c\/strong\u003e Packaged dimensions for the Sierra 18-2791 kit are 10.88 x 8 x 1.75 inches, with item dimensions of 8 x 1.75 x 10.87 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2791 seal kit manufactured?\u003c\/strong\u003e This kit's country of origin is Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color are the components in the 18-2791 kit?\u003c\/strong\u003e The kit is listed in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2791 kit come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-2791 Lower Unit Seal Kit is covered by a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seal kits come in one 18-2791 package?\u003c\/strong\u003e One 18-2791 kit contains a single unit (Number of Items: 1), and it is priced and sold per piece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need the 18-2791 Lower Unit Seal Kit?\u003c\/strong\u003e This kit is used when servicing or rebuilding a lower unit gearcase that originally used seal 3850597, such as during a reseal to stop gear lube leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2791 the correct part number to search for this seal kit?\u003c\/strong\u003e Yes, 18-2791 is the public Sierra part number for this Lower Unit Seal Kit and is the number to reference when ordering or cross-checking against OEM 3850597.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988113305819,"sku":"SIE-18-2791","price":132.24,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2791_lg__19628.1558123639.500.750.jpg?v=1785188297","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2791-gearcase-seal-kit-replaces-omc-volvo-penta-987251-fits-3-0l-4-3l-5-0l-5-7l-7-4l-8-2l-sterndrives-1992-1995","provider":"Good Vibes Marina","version":"1.0","type":"link"}