{"product_id":"sierra-18-0685-valve-cover-gasket-replaces-mercury-27-73666-fits-mercruiser-3-7l-224-cid-engines","title":"Sierra Carburetor Mounting Gasket 18-0685, Replaces 27-64692 \u0026 27-32910, For Rochester Carburetors","description":"\u003cp\u003eThe Sierra 18-0685 is a carburetor mounting gasket designed for Rochester carburetors on marine inboard and sterndrive engines. It seals the joint between the carburetor base and the intake manifold, preventing vacuum leaks and unmetered air from entering the intake tract that can cause rough idle, hard starting, or an incorrect air-fuel mixture. Installing a properly sized, marine-grade gasket at this joint is a standard step whenever a carburetor is removed for service, rebuilt, or replaced.\u003c\/p\u003e\u003cp\u003eThis gasket is a direct-fit replacement for Rochester carburetor applications and cross-references to OEM part numbers 27-64692 and 27-32910, so it can be ordered using either the Sierra part number or the original OEM number. It is built to seal reliably against the heat, vibration, and fuel exposure found at the carburetor base on a running marine engine.\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 18-0685\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Carburetor Mounting Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e For Rochester carburetors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 27-64692, 27-32910\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.3 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282120061\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eFor Rochester carburetors\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-64692\u003c\/li\u003e\n\u003cli\u003e27-32910\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0685 gasket fit?\u003c\/strong\u003e The Sierra 18-0685 is a carburetor mounting gasket made for Rochester carburetors, sealing the base of the carburetor to the intake manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0685 gasket the same as OEM part 27-64692?\u003c\/strong\u003e Yes, Sierra 18-0685 directly cross-references to OEM numbers 27-64692 and 27-32910, so it can be used as a like-for-like replacement for either of those part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM numbers does this gasket replace?\u003c\/strong\u003e This gasket replaces OEM numbers 27-64692 and 27-32910.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0685 gasket weigh?\u003c\/strong\u003e The Sierra 18-0685 carburetor mounting gasket weighs 0.3 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket work with any carburetor?\u003c\/strong\u003e No, the 18-0685 is designed specifically for Rochester carburetors and should be matched to that application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a new gasket every time I remove the carburetor?\u003c\/strong\u003e Yes, a carburetor mounting gasket like the Sierra 18-0685 should be replaced whenever the carburetor is removed, since reusing a compressed gasket can lead to vacuum leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate a failed carburetor mounting gasket?\u003c\/strong\u003e A failing carburetor base gasket, such as the one replaced by Sierra 18-0685, can cause rough idle, hesitation, or an inconsistent air-fuel mixture from unmetered air entering at the carburetor base.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0685 an OEM or aftermarket part?\u003c\/strong\u003e Sierra 18-0685 is a Sierra-branded replacement gasket engineered to match the fit and sealing performance of the OEM carburetor mounting gaskets it cross-references, 27-64692 and 27-32910.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part 18-0685?\u003c\/strong\u003e Ordering Sierra 18-0685 provides one carburetor mounting gasket sized for Rochester carburetor applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I order this gasket using the OEM part number instead of the Sierra number?\u003c\/strong\u003e Yes, since 18-0685 cross-references to OEM numbers 27-64692 and 27-32910, either number identifies the same gasket.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988084469979,"sku":"SIE-18-0685","price":63.3,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0685_lg__41203.1558118643.500.750.jpg?v=1785188179","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-0685-valve-cover-gasket-replaces-mercury-27-73666-fits-mercruiser-3-7l-224-cid-engines","provider":"Good Vibes Marina","version":"1.0","type":"link"}