{"product_id":"sierra-18-2672-lower-unit-seal-kit-replaces-omc-984458-985613-439967-fits-v6-v8-omc-cobra-sterndrive-1986-1991","title":"Sierra Lower Unit Seal Kit 18-2672, Replaces OMC 439967\/984458\/985613, for V6\/V8 Cobra Stern Drive (1986-1991)","description":"\u003cp\u003eThe Sierra 18-2672 Lower Unit Seal Kit is a complete set of replacement seals for the lower unit of OMC V6\/V8 Cobra stern drives from the 1986-1991 model years. It is built to restore the watertight, oil-tight seal between the lower unit housing and internal shift components, a common maintenance point when a drive shows signs of gear lube seepage, water intrusion, or shift linkage wear at the lower unit interface. The kit is a direct cross-reference for OMC part numbers 439967, 984458, and 985613, so it fits in place of the original equipment components without modification.\u003c\/p\u003e\u003cp\u003eInside the kit you get a shift cover gasket, two grommets, and a wiper, each matched to its corresponding OMC original equipment number so a technician or DIY boater can complete a full lower unit reseal in one job rather than sourcing individual seals separately. The kit is compatible with OMC Cobra stern drive models SF-20, SF-25, SF-30, SF-35, SF-42, SF-20F, SF-25F, SF-30F, SF-35F, and SF-42F. At 0.19 pounds, it ships as a compact small-parts kit intended for use during routine lower unit service or gear lube changes on applicable Cobra stern drives.\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 18-2672\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Lower Unit Seal Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e All V6\/V8 Cobra (1986-1991)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Models:\u003c\/strong\u003e SF-20, SF-25, SF-30, SF-35, SF-42, SF-20F, SF-25F, SF-30F, SF-35F, SF-42F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Shift Cover Gasket (OEM 911878, Qty 1), Grommet (OEM 911705, Qty 2), Wiper (OEM 912157, Qty 1)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.19 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999312839\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eAll V6\/V8 Cobra (1986-1991)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e439967\u003c\/li\u003e\n\u003cli\u003e984458\u003c\/li\u003e\n\u003cli\u003e985613\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2672 lower unit seal kit fit?\u003c\/strong\u003e The 18-2672 kit is built for all V6\/V8 Cobra stern drives from the 1986-1991 model years, including the SF-20, SF-25, SF-30, SF-35, SF-42, SF-20F, SF-25F, SF-30F, SF-35F, and SF-42F models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does 18-2672 replace?\u003c\/strong\u003e Sierra 18-2672 cross-references to OMC part numbers 439967, 984458, and 985613, so it installs in place of any of those original equipment numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-2672 seal kit?\u003c\/strong\u003e The kit contains one shift cover gasket (OEM 911878), two grommets (OEM 911705), and one wiper (OEM 912157), covering the seal points typically serviced together on a Cobra lower unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2672 lower unit seal kit weigh?\u003c\/strong\u003e The Sierra 18-2672 kit weighs 0.19 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color are the components in the 18-2672 kit?\u003c\/strong\u003e The seal kit components in Sierra 18-2672 are white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2672 a genuine OMC part or an aftermarket replacement?\u003c\/strong\u003e 18-2672 is a Sierra-manufactured replacement kit, not an original OMC part, but it is a direct equivalent to OMC 439967, 984458, and 985613 and is designed to fit the same applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-2672 fit 4-cylinder Cobra drives?\u003c\/strong\u003e No, the 18-2672 kit is designated for V6\/V8 Cobra stern drives (1986-1991); a 4-cylinder Cobra seal kit is a separate part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-2672 to fix gear lube leaks at the lower unit?\u003c\/strong\u003e Yes, the shift cover gasket, grommets, and wiper in the Sierra 18-2672 kit are the seal points commonly responsible for gear lube seepage at the lower unit on applicable V6\/V8 Cobra drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many grommets come in the Sierra 18-2672 kit?\u003c\/strong\u003e Two grommets (OEM 911705) are included in the 18-2672 lower unit seal kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs professional installation required for the 18-2672 seal kit?\u003c\/strong\u003e The kit supplies the gasket, grommets, and wiper for a lower unit reseal on V6\/V8 Cobra stern drives; installation follows standard lower unit disassembly and is commonly performed by a marine technician or an experienced DIY boater.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988108751067,"sku":"SIE-18-2672","price":70.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2672_lg__70066.1558122714.500.750.jpg?v=1785188870","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2672-lower-unit-seal-kit-replaces-omc-984458-985613-439967-fits-v6-v8-omc-cobra-sterndrive-1986-1991","provider":"Good Vibes Marina","version":"1.0","type":"link"}