{"product_id":"sierra-18-2022-oil-seal-replaces-omc-303345-evinrude-johnson-outboard-prop-driveshaft-seal","title":"Sierra 18-2022 Oil Seal - Replaces OMC 303345 for Evinrude Outboard Prop and Driveshaft","description":"\u003cp\u003eThe Sierra 18-2022 Oil Seal is a direct-fit replacement seal engineered for Evinrude outboard prop and driveshaft applications. This small bolt-on component seals against water and lubricant loss around the driveshaft, protecting the gearcase from water intrusion and helping maintain proper lubrication at the seal interface. It is designed as a drop-in equivalent for the OMC 303345 seal, making it a straightforward swap during gearcase service, lower unit rebuilds, or routine seal replacement.\u003c\/p\u003e\u003cp\u003eInstallation is bolt-on and does not require special tools beyond standard seal installation practice. Because seals are wear items that harden and lose sealing ability over time, replacing the 18-2022 at the first sign of water intrusion or oil seepage helps prevent more costly gearcase damage. Each unit is sold individually and is intended for one seal position per the catalog listing quantity.\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 18-2022\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Oil Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Prop and Driveshaft Seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Type:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity per Package:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999309686\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Evinrude outboard prop and driveshaft applications that use the OMC 303345 oil seal.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 303345\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2022 oil seal fit?\u003c\/strong\u003e The Sierra 18-2022 is designed for Evinrude outboard prop and driveshaft applications that originally used the OMC 303345 oil seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2022 seal equivalent to an OMC part?\u003c\/strong\u003e Yes, the Sierra 18-2022 replaces OMC part number 303345 and is built as a direct functional equivalent for that position.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this oil seal?\u003c\/strong\u003e The Sierra 18-2022 oil seal measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2022 oil seal weigh?\u003c\/strong\u003e This seal weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-2022 oil seal installed?\u003c\/strong\u003e Installation is bolt-on, meaning the seal presses or bolts into place in the gearcase without requiring modification to surrounding components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in one package?\u003c\/strong\u003e One Sierra 18-2022 oil seal is included per package, matching a one-per-position replacement need.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the 18-2022 oil seal?\u003c\/strong\u003e This seal should be replaced when water intrusion, oil seepage, or gearcase leaks are noticed, or during a scheduled lower unit or gearcase service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2022 oil seal?\u003c\/strong\u003e The UPC for the Sierra 18-2022 oil seal is 030999309686.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2022 a genuine OMC part or aftermarket?\u003c\/strong\u003e The Sierra 18-2022 is a Sierra-branded aftermarket seal manufactured to replace the OMC 303345 oil seal, not an OMC-branded original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of Evinrude parts does the 18-2022 belong to?\u003c\/strong\u003e It is listed under Evinrude outboard prop and driveshaft seals, reflecting its use at the driveshaft\/prop seal position on Evinrude outboards.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988090400987,"sku":"SIE-18-2022","price":20.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2022__60838.1722351139.500.750.jpg?v=1785188146","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2022-oil-seal-replaces-omc-303345-evinrude-johnson-outboard-prop-driveshaft-seal","provider":"Good Vibes Marina","version":"1.0","type":"link"}