{"product_id":"wear-plate-gasket-2-pack-replaces-mercury-322858-fits-v-4-v-6-outboards-sierra-18-2709","title":"Sierra Wear Plate Gasket 18-2709-9, Replaces Mercury 336530, V-4\/V-6 Outboard, Pack of 2","description":"\u003cp\u003eThe Sierra Wear Plate Gasket, part number 18-2709-9, seals the wear plate against the water pump housing on V-4\/V-6 Mercury outboard engines. This gasket is a critical component of the lower unit water pump assembly, forming the seal that keeps cooling water flowing through the correct passages and prevents leaks or loss of pump pressure that can lead to overheating. Each package contains 2 gaskets, so buyers replacing a full water pump kit or servicing multiple units have enough material on hand without ordering twice.\u003c\/p\u003e\u003cp\u003eWear plate gaskets are a wear item that should be replaced any time the water pump housing is removed for service, since a reused or hardened gasket will not seal properly against the wear plate and can allow water to bypass the impeller housing. Installing a fresh 18-2709-9 gasket during every water pump rebuild helps maintain proper cooling system pressure and reduces the risk of a repeat teardown. The gasket is sized specifically for V-4\/V-6 Mercury outboard water pump assemblies and directly replaces Mercury part number 336530.\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 18-2709-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Wear Plate Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Application:\u003c\/strong\u003e V-4\/V-6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282163150\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eV-4\/V-6 Mercury outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury 336530\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-2709-9 wear plate gasket fit?\u003c\/strong\u003e The 18-2709-9 wear plate gasket is designed for V-4\/V-6 Mercury outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket cross-reference to an OEM Mercury part number?\u003c\/strong\u003e Yes, Sierra 18-2709-9 replaces Mercury part number 336530.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package of 18-2709-9?\u003c\/strong\u003e Each package of the 18-2709-9 wear plate gasket contains 2 gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2709-9 wear plate gasket weigh?\u003c\/strong\u003e The Sierra 18-2709-9 wear plate gasket weighs 0.02 pounds per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the wear plate gasket be replaced?\u003c\/strong\u003e Any time the water pump housing is removed for service on a V-4\/V-6 Mercury outboard, the 18-2709-9 wear plate gasket should be replaced rather than reused, since a worn gasket will not seal properly against the wear plate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this an aftermarket or genuine Mercury part?\u003c\/strong\u003e Sierra 18-2709-9 is an aftermarket gasket manufactured to replace Mercury OEM part 336530, offering the same fit and seal at the wear plate location.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the wear plate gasket seal against?\u003c\/strong\u003e It seals the wear plate against the water pump housing, maintaining proper cooling water flow through the lower unit on V-4\/V-6 Mercury outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I buy just one gasket instead of the 2-pack?\u003c\/strong\u003e The 18-2709-9 wear plate gasket is sold only in a package of 2, which is enough for a full water pump service or two separate repairs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a worn or reused gasket cause overheating?\u003c\/strong\u003e If the wear plate gasket does not seal completely, water can bypass the impeller housing and reduce pump pressure, which can lead to overheating in the V-4\/V-6 Mercury outboard cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs a UPC code available for this gasket for retail tracking?\u003c\/strong\u003e Yes, the Sierra 18-2709-9 wear plate gasket package carries UPC 808282163150.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988109209819,"sku":"SIE-18-2709-9","price":3.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sierra_lg_1206__66188.1558125519.500.750.jpg?v=1785329193","url":"https:\/\/www.goodvibesmarina.com\/products\/wear-plate-gasket-2-pack-replaces-mercury-322858-fits-v-4-v-6-outboards-sierra-18-2709","provider":"Good Vibes Marina","version":"1.0","type":"link"}