{"product_id":"sierra-18-0334-mounting-plate-to-driveshaft-housing-gasket-for-mercury-outboards-replaces-27-39402","title":"Sierra Mounting Plate to Driveshaft Housing Gasket 18-0334 for Mercury Outboards","description":"\u003cp\u003eThe Sierra 18-0334 is a mounting plate to driveshaft housing gasket designed for Mercury outboard motor applications. This gasket seats between the mounting plate and the driveshaft housing to form a tight, reliable seal at that joint, helping keep water out and lubricants in as the lower unit assembly operates. Replacing a worn, cracked, or compressed gasket at this location during a lower unit rebuild, driveshaft housing removal, or general maintenance service helps restore the original factory seal and prevents water intrusion that can lead to corrosion or gearcase damage over time.\u003c\/p\u003e\u003cp\u003eSierra manufactures this gasket to match the fit and function of the original equipment part it replaces, making it a straightforward drop-in choice when servicing the mounting plate and driveshaft housing area on a Mercury outboard. The part ships as a single gasket, part number 18-0334, and is sold individually for one repair.\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 18-0334\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Mounting Plate to Driveshaft Housing Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.09 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 gasket per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999873231\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury outboard motors (mounting plate to driveshaft housing joint)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0334 gasket used for?\u003c\/strong\u003e The Sierra 18-0334 is a mounting plate to driveshaft housing gasket that seals the joint between the mounting plate and the driveshaft housing on a Mercury outboard motor, helping prevent water intrusion at that connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket fit Mercury outboards?\u003c\/strong\u003e Yes, part number 18-0334 is designed for the mounting plate to driveshaft housing joint on Mercury outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package?\u003c\/strong\u003e One Sierra 18-0334 gasket is included per package, sold individually for a single repair or rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0334 gasket weigh?\u003c\/strong\u003e The Sierra 18-0334 mounting plate to driveshaft housing gasket weighs 0.09 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0334 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e 18-0334 is manufactured by Sierra as a replacement part designed to match the fit and function of the original mounting plate to driveshaft housing gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this gasket?\u003c\/strong\u003e This gasket should be replaced any time the mounting plate or driveshaft housing is removed for service, or if the existing gasket is torn, cracked, or compressed and no longer sealing properly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if this gasket fails or is left out during reassembly?\u003c\/strong\u003e A failed or missing gasket at the mounting plate to driveshaft housing joint can allow water to enter the lower unit area, which can lead to corrosion or damage to internal components over time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this gasket be reused after removal?\u003c\/strong\u003e Gaskets like the Sierra 18-0334 are designed for one-time use; once the mounting plate or driveshaft housing has been separated, installing a new gasket such as this one is recommended to maintain a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-0334 gasket made from?\u003c\/strong\u003e Sierra part 18-0334 is a gasket designed to seal the mounting plate to driveshaft housing joint on Mercury outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-0334 gasket straightforward?\u003c\/strong\u003e Yes, the Sierra 18-0334 is a direct-fit gasket that installs between the mounting plate and driveshaft housing during reassembly, following standard gasket installation practice for that joint.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988065333467,"sku":"SIE-18-0334","price":3.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0334_lg__19203.1558121129.500.750.jpg?v=1785188820","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-0334-mounting-plate-to-driveshaft-housing-gasket-for-mercury-outboards-replaces-27-39402","provider":"Good Vibes Marina","version":"1.0","type":"link"}