{"product_id":"head-gasket-for-mercury-135-150-xr4-outboards-replaces-oem-27-187851-sierra-18-3864","title":"Sierra 18-3864 Head Gasket, Replaces Mercury Marine 27-822844-1, Fits V-150 XR6\/MAGNUM III V-6 Outboard","description":"\u003cp\u003eThe Sierra 18-3864 Head Gasket is a machined outboard engine gasket built to seal the cylinder head on Mercury Marine outboard powerheads, sealing the mating surface between the cylinder head and the block to maintain compression and prevent coolant or combustion leaks. It is designed as a direct cross reference to Mercury Marine OEM part 27-822844-1, giving boat owners and marine technicians a Sierra-branded replacement for engine rebuilds, head resurfacing jobs, and routine maintenance on compatible Mercury outboards. The gasket is manufactured with a machined finish for a precise, consistent seal against the head and block surfaces.\u003c\/p\u003e\u003cp\u003eThis head gasket is intended for the Mercury V-150 (XR6\/MAGNUM III) V-6 outboard powerhead. It carries UPC 030999753724 and weighs 0.17 pounds, with compact packaged dimensions of 0.39 x 0.39 x 0.39 inches. As with all Sierra parts, the 18-3864 is backed by Sierra's standard customer satisfaction warranty, and it remains an actively available part, not discontinued by the manufacturer.\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 18-3864\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Head Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 27-822844-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999753724\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.17 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercury V-150 (XR6\/MAGNUM III) V-6 outboard\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits the Mercury V-150 (XR6\/MAGNUM III) V-6 outboard powerhead.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eMercury Marine 27-822844-1\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat Mercury outboard does the Sierra 18-3864 head gasket fit?\u003c\/strong\u003e The Sierra 18-3864 head gasket is built for the Mercury V-150 (XR6\/MAGNUM III) V-6 outboard powerhead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM Mercury Marine part number does 18-3864 replace?\u003c\/strong\u003e It replaces Mercury Marine part number 27-822844-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-3864 the correct part number to order?\u003c\/strong\u003e Yes, 18-3864 is the Sierra manufacturer part number for this head gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this head gasket weigh?\u003c\/strong\u003e The Sierra 18-3864 head gasket weighs 0.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-3864 head gasket?\u003c\/strong\u003e It measures 0.39 x 0.39 x 0.39 inches as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material or finish does the 18-3864 head gasket have?\u003c\/strong\u003e This gasket has a machined finish for a precise seal between the cylinder head and block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-3864 is a genuine Sierra part, manufactured as a direct replacement for Mercury Marine 27-822844-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3864 head gasket come with a warranty?\u003c\/strong\u003e Yes, Sierra parts including the 18-3864 head gasket are covered under Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3864 head gasket?\u003c\/strong\u003e The UPC for this head gasket is 030999753724.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHas the 18-3864 head gasket been discontinued by the manufacturer?\u003c\/strong\u003e No, the Sierra 18-3864 head gasket is not discontinued and remains actively available.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the Sierra 18-3864 and OEM 27-822844-1?\u003c\/strong\u003e The Sierra 18-3864 is manufactured to the same specification as Mercury Marine OEM part 27-822844-1 and is designed as a direct replacement for it.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988168716507,"sku":"SIE-18-3864","price":41.12,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3864_lg__71569.1558125483.500.750.jpg?v=1785188317","url":"https:\/\/www.goodvibesmarina.com\/products\/head-gasket-for-mercury-135-150-xr4-outboards-replaces-oem-27-187851-sierra-18-3864","provider":"Good Vibes Marina","version":"1.0","type":"link"}