{"product_id":"sierra-18-0333-powerhead-base-gasket-replaces-mercury-mariner-27-39401-fits-mercury-mariner-outboards","title":"Sierra Powerhead Base Gasket 18-0333, Replaces Mercury 27-39401, Fits Mercury\/Mariner Outboard Motors","description":"\u003cp\u003eThe Sierra 18-0333 is a powerhead base gasket engineered as a direct replacement for Mercury Marine part number 27-39401. It is designed to fit Mercury and Mariner outboard motors, sealing the joint between the powerhead and the driveshaft housing to maintain proper compression and prevent water or exhaust leakage at this critical junction. A powerhead base gasket is a wear item that should be replaced any time the powerhead is removed for service, since reusing an old gasket can compromise the seal and lead to leaks or reduced performance.\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 18-0333\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Powerhead Base Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999873224\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury outboard motors\u003c\/li\u003e\n\u003cli\u003eMariner outboard motors\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-39401\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0333 gasket fit?\u003c\/strong\u003e The Sierra 18-0333 powerhead base gasket is designed to fit Mercury and Mariner outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-0333 replace?\u003c\/strong\u003e It replaces Mercury Marine part number 27-39401.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0333 gasket the same as the OEM 27-39401 part?\u003c\/strong\u003e Yes, the Sierra 18-0333 is built to replace Mercury Marine 27-39401 as a direct equivalent for the powerhead base seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0333 gasket weigh?\u003c\/strong\u003e The 18-0333 powerhead base gasket weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the powerhead base gasket installed?\u003c\/strong\u003e The 18-0333 is installed at the base of the powerhead, sealing the joint between the powerhead and the driveshaft housing on Mercury and Mariner outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the powerhead base gasket?\u003c\/strong\u003e The 18-0333 should be replaced any time the powerhead is removed from the driveshaft housing for service, since reusing the old gasket can result in a poor seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0333 gasket work on Mariner-branded outboards?\u003c\/strong\u003e Yes, the 18-0333 is designed to fit both Mercury and Mariner outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0333 gasket?\u003c\/strong\u003e The Sierra 18-0333 powerhead base gasket carries UPC 030999873224.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0333 a genuine Sierra part or a generic gasket?\u003c\/strong\u003e The 18-0333 is a Sierra-branded powerhead base gasket manufactured to replace Mercury Marine 27-39401.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-0333?\u003c\/strong\u003e Ordering the 18-0333 gets you one Sierra powerhead base gasket sized to replace Mercury Marine 27-39401.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988065005787,"sku":"SIE-18-0333","price":2.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0333_lg__93019.1558121069.500.750.jpg?v=1785188228","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-0333-powerhead-base-gasket-replaces-mercury-mariner-27-39401-fits-mercury-mariner-outboards","provider":"Good Vibes Marina","version":"1.0","type":"link"}