{"product_id":"sierra-18-0939-9-upper-gearcase-dipstick-gasket-replaces-omc-315189-pack-of-2","title":"Sierra 18-0939-9 Upper Gearcase Dipstick Gasket - Replaces OMC 315189 - Pack of 2","description":"\u003cp\u003eThe Sierra 18-0939-9 Upper Gearcase Dipstick Gasket is a replacement gasket for the upper gearcase dipstick opening on applicable outboard and sterndrive gearcases, sold as a pack of 2 for stocking spares or servicing multiple units. It is designed to seal the dipstick tube against the gearcase housing, helping prevent gear lubricant from seeping out around the dipstick during normal operation and while checking gearcase oil level. Sierra manufactures this gasket to meet or exceed the quality of the original equipment part it replaces, giving installers a reliable option when performing gearcase service, dipstick replacement, or general lower-unit maintenance. Because the gasket is a wear item that can harden, compress, or tear over time, replacing it whenever the dipstick is removed for service helps maintain a proper seal and avoid oil loss. The 18-0939-9 gasket is interchangeable with OMC part number 315189, making it a straightforward like-for-like replacement for technicians and boat owners who already have the OMC part number from their service manual or parts diagram. Its small size and low weight make it an easy, low-cost addition to a maintenance parts kit alongside other gearcase seals and gaskets.\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 18-0939-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDescription:\u003c\/strong\u003e Upper Gearcase Dipstick Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282162047\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e OMC 315189\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications originally using OMC gearcase gasket part number 315189. Check your dipstick tube gasket location against this part number before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 315189\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0939-9 gasket fit?\u003c\/strong\u003e The Sierra 18-0939-9 Upper Gearcase Dipstick Gasket is designed as a direct replacement for OMC part number 315189, so it fits any application that originally used that OMC gasket at the upper gearcase dipstick opening.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0939-9 gasket the same as OMC 315189?\u003c\/strong\u003e Yes, Sierra part 18-0939-9 is interchangeable with OMC 315189 and is built to meet or exceed the quality of that original equipment gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a pack?\u003c\/strong\u003e The Sierra 18-0939-9 is sold as a pack of 2 upper gearcase dipstick gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e Each package of the Sierra 18-0939-9 gasket weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the upper gearcase dipstick gasket?\u003c\/strong\u003e The dipstick gasket should be replaced any time the dipstick is removed for gearcase service, since the Sierra 18-0939-9 gasket can lose its seal after being disturbed or after prolonged use, leading to oil seepage around the dipstick.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-0939-9 is a genuine Sierra International part manufactured to meet or exceed the original equipment specification of OMC 315189, not a generic aftermarket substitute.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0939-9?\u003c\/strong\u003e The UPC for the Sierra 18-0939-9 Upper Gearcase Dipstick Gasket is 808282162047.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e Ordering the Sierra 18-0939-9 gets you a pack of 2 upper gearcase dipstick gaskets; no other hardware or tools are included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use this gasket for general gearcase maintenance?\u003c\/strong\u003e Yes, the Sierra 18-0939-9 gasket is commonly used during routine gearcase oil checks and service any time the dipstick is pulled and reinstalled.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra list any other cross-reference numbers for this gasket?\u003c\/strong\u003e The only cross-reference listed for the Sierra 18-0939-9 gasket is OMC part number 315189.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086599899,"sku":"SIE-18-0939-9","price":2.3,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0939_lg__61119.1558120843.500.750.jpg?v=1785188214","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-0939-9-upper-gearcase-dipstick-gasket-replaces-omc-315189-pack-of-2","provider":"Good Vibes Marina","version":"1.0","type":"link"}