{"product_id":"2778690002-mercury-mercruiser-relief-valve-cover-gasket-genuine-quicksilver-oem-part","title":"2778690002 Mercury MerCruiser Relief Valve Cover Gasket | Genuine Quicksilver OEM Part","description":"\u003cp\u003e\n 🔧 Product Description\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Genuine Quicksilver Relief Valve Cover Gasket - Part Number: 27-78690002\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n A genuine Quicksilver relief valve cover and plate gasket for Mercury V6 outboard cooling-system relief valve assemblies. This gasket seals the poppet \/ relief valve cover area to help maintain correct cooling-water pressure and prevent leakage at the cover joint.\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n ⚙️ Key Features\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Genuine Quicksilver OEM gasket\n\u003c\/p\u003e\n\u003cp\u003e\n • Correct Mercury part number 27-78690002\n\u003c\/p\u003e\n\u003cp\u003e\n • Relief valve cover and plate gasket for Mercury V6 cooling systems\n\u003c\/p\u003e\n\u003cp\u003e\n • Also referenced as 27-78690, 27-78690002 and 2778690002\n\u003c\/p\u003e\n\u003cp\u003e\n • Cross-referenced with Sierra, Mallory and GLM gasket equivalents\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n 🔄 Supersession \u0026amp; Cross Reference\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n OEM Supersession Chain:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • 27-78690002 current OEM service reference\n\u003c\/p\u003e\n\u003cp\u003e\n • 27-78690 earlier \/ related OEM relief valve cover gasket reference\n\u003c\/p\u003e\n\u003cp\u003e\n • 27-67624 earlier related relief valve cover gasket reference\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n OEM \/ Related Numbers:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • 27-78690002\n\u003c\/p\u003e\n\u003cp\u003e\n • 78690002\n\u003c\/p\u003e\n\u003cp\u003e\n • 2778690002\n\u003c\/p\u003e\n\u003cp\u003e\n • 27-78690\n\u003c\/p\u003e\n\u003cp\u003e\n • 78690\n\u003c\/p\u003e\n\u003cp\u003e\n • 27-67624\n\u003c\/p\u003e\n\u003cp\u003e\n • 67624\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Aftermarket \/ Verified Equivalents:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Sierra: 18-0936\n\u003c\/p\u003e\n\u003cp\u003e\n • Mallory: 9-60057\n\u003c\/p\u003e\n\u003cp\u003e\n • GLM: 31990\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n 🚤 Compatibility\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Commonly used on:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V6 2.5L cooling-system relief valve \/ poppet valve cover assemblies\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury DFI, EFI, Pro XS, Jet Drive and high-performance V6 outboard applications using 27-78690002\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Typically suits:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine models:\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 200 DFI Jet Drive powerhead - serial 0E435742 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 200 DFI Jet Drive powerhead - serial 1B321662 to 1B321669\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 200 DFI Jet Drive pump - serial 0M964699 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 200 DFI M2 Jet Drive pump - serial 0M965234 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury Magnum III - serial 0G960500 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-135 - serial 0G960500 to 0T178499\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-135 DFI 2.5L - serial 0T801000 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-135 DFI 2.5L - serial 1B227000 to 1B417701\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-135 DFI 2.5L - serial 1B417702 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-140 International - serial 0T178500 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-150 - serial 0G960500 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-150 DFI 2.5L - serial 0T801000 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-150 DFI 2.5L - serial 1B227000 to 1B417701\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-150 DFI 2.5L - serial 1B417702 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-150 EFI 2.5L - serial 0T801000 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-150 EFI 2.5L - serial 1B227000 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-175 DFI 2.5L - serial 0T801000 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-175 DFI 2.5L - serial 1B227000 to 1B417701\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-175 DFI 2.5L - serial 1B417702 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-200 - serial 0G960500 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-200 EFI 2.5L - serial 0T801000 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury V-200 EFI 2.5L - serial 1B227000 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury XR-6 - serial 0G960500 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 200XS DFI 2.5L - serial 0T818181 to 1E000796\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 200XS DFI 2.5L - serial 1E000797 to 1E002110\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 200XS DFI 2.5L ROS - serial 1E050852 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 200XS SST - serial 1E050629 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 225X EFI ProMax - serial 0T430254 to 0T819605\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 110 Jet 2.5L - serial 1B690542 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 140 Jet - serial 0G960500 to 0T178499\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 150 Pro XS 2.5L - serial 1B690542 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 175 Pro XS 2.5L - serial 1B516339 and up\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • HP Range: commonly 110HP - 225HP where 27-78690002 is specified\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine Type: Mercury V6 2-stroke, EFI and DFI outboard cooling system\n\u003c\/p\u003e\n\u003cp\u003e\n • System Type: Relief valve \/ poppet valve cover gasket\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n 🔌 Function\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n The relief valve cover gasket seals the cooling-system relief valve cover and plate so the valve can regulate cooling-water pressure without leakage at the cover joint.\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Common signs of failure:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Water leaking from the relief valve cover area\n\u003c\/p\u003e\n\u003cp\u003e\n • Cooling-water pressure loss\n\u003c\/p\u003e\n\u003cp\u003e\n • Overheating at idle or under load\n\u003c\/p\u003e\n\u003cp\u003e\n • Salt build-up around the poppet valve cover\n\u003c\/p\u003e\n\u003cp\u003e\n • Gasket damage during relief valve service\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n 📦 Condition\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Genuine Quicksilver part\n\u003c\/p\u003e\n\u003cp\u003e\n • Brand new\n\u003c\/p\u003e\n\u003cp\u003e\n • Supplied in original or equivalent packaging\n\u003c\/p\u003e\n","brand":"Quicksilver","offers":[{"title":"Default Title","offer_id":53388037816612,"sku":"107763T","price":6.9,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/8115\/7924\/files\/original_35e76c42-fc1c-4c62-9042-ca0ff7b2909d.jpg?v=1777210601","url":"https:\/\/www.sawleysautoandmarine.com.au\/products\/2778690002-mercury-mercruiser-relief-valve-cover-gasket-genuine-quicksilver-oem-part","provider":"Sawley's Auto and Marine","version":"1.0","type":"link"}