{"product_id":"sierra-18-2028-oil-seal-replaces-omc-321480-evinrude-omc-outboard-prop-driveshaft","title":"Sierra Oil Seal 18-2028, Replaces OMC 321480, for Evinrude Outboard Prop and Driveshaft","description":"\u003cp\u003eThe Sierra 18-2028 Oil Seal is a replacement oil seal engineered for Evinrude outboard prop and driveshaft applications. It is designed as a direct equivalent to OMC part number 321480, giving boat owners and technicians a reliable way to restore a proper seal without sourcing increasingly hard-to-find original equipment parts. The seal has a machined exterior finish for a precise, consistent fit against the mating surfaces it seals.\u003c\/p\u003e\u003cp\u003eThis is a compact, lightweight component at just 0.02 pounds, sized to fit into the prop and driveshaft seal area of the outboard lower unit. Keeping this seal in good condition helps prevent water intrusion and lubricant loss around the driveshaft and propeller shaft, both of which can lead to gear case damage if left unaddressed. Because it is a direct OEM cross-reference part, it installs the same way the original 321480 seal did, using standard hand tools and typical lower-unit service procedures.\u003c\/p\u003e\u003cp\u003eThe 18-2028 is intended for outboard owners performing routine lower unit maintenance, seal replacement during a gear case rebuild, or repair work after a water intrusion issue is diagnosed. It is manufactured in China and shipped as a single seal.\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 18-2028\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 321480\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 0.508 H x 4.572 L x 3.302 W (centimeters)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Evinrude outboard prop and driveshaft seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309747\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude outboard prop and driveshaft seal application\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 321480\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2028 oil seal replace?\u003c\/strong\u003e The Sierra 18-2028 is a direct cross-reference to OMC part number 321480, so it can be used anywhere that original seal was specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2028 used for?\u003c\/strong\u003e It is an oil seal used in the prop and driveshaft area of Evinrude outboard lower units, sealing against water intrusion and lubricant loss.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2028 oil seal weigh?\u003c\/strong\u003e It weighs 0.02 pounds, making it a small, lightweight lower-unit seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2028 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-2028 is a Sierra-branded replacement part manufactured to cross-reference OMC 321480, sold as a Sierra aftermarket equivalent rather than an OMC-branded original.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-2028 seal have?\u003c\/strong\u003e This oil seal has a machined exterior finish for a precise fit at the sealing surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2028 oil seal manufactured?\u003c\/strong\u003e The 18-2028 oil seal is manufactured in China.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2028 come as a single seal or a set?\u003c\/strong\u003e The Sierra 18-2028 is supplied as a single oil seal, not a multi-piece kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the 18-2028 seal?\u003c\/strong\u003e The Sierra 18-2028 ships in packaging measuring 0.508 cm high by 4.572 cm long by 3.302 cm wide.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-2028 fit any outboard other than Evinrude?\u003c\/strong\u003e The Sierra 18-2028 is listed under Evinrude outboard prop and driveshaft seal applications; fitment outside that application is not specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know I need to replace this oil seal?\u003c\/strong\u003e Signs like water in the lower unit lubricant or lubricant leaking from the driveshaft or prop shaft area typically indicate the oil seal, such as the Sierra 18-2028, needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2028 include installation hardware?\u003c\/strong\u003e No, the 18-2028 is the oil seal itself; no additional hardware is included in the package.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090597595,"sku":"SIE-18-2028","price":16.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2028__60195.1722366087.500.750.jpg?v=1785188986","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2028-oil-seal-replaces-omc-321480-evinrude-omc-outboard-prop-driveshaft","provider":"Good Vibes Marina","version":"1.0","type":"link"}