{"product_id":"8m0008243-mercury-mercruiser-mercury-thermostat-cover-genuine-quicksilver-oem-part","title":"8M0008243 Mercury MerCruiser Thermostat Cover | 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 Thermostat Cover - Part Number: 8M0008243\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n A genuine Quicksilver thermostat cover used on selected Mercury and Mariner small and mid-range FourStroke outboard cooling systems. This cover seals the thermostat cavity and retains the thermostat and gasket in the correct position.\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 thermostat cover\n\u003c\/p\u003e\n\u003cp\u003e\n • Correct Mercury part number 8M0008243\n\u003c\/p\u003e\n\u003cp\u003e\n • Superseded to later 8M0188835 service reference\n\u003c\/p\u003e\n\u003cp\u003e\n • Replaces \/ cross-references with 857080 and 8250311 cover references\n\u003c\/p\u003e\n\u003cp\u003e\n • Also cross-references with Yamaha 6H3 thermostat cover family\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 • 8M0188835 → Supersedes 8M0008243\n\u003c\/p\u003e\n\u003cp\u003e\n • 8M0008243 earlier OEM thermostat cover reference\n\u003c\/p\u003e\n\u003cp\u003e\n • 857080 related earlier Mercury \/ Mariner thermostat cover reference\n\u003c\/p\u003e\n\u003cp\u003e\n • 8250311 related thermostat cover 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 • 8M0008243\n\u003c\/p\u003e\n\u003cp\u003e\n • 8M0188835\n\u003c\/p\u003e\n\u003cp\u003e\n • 857080\n\u003c\/p\u003e\n\u003cp\u003e\n • 8250311\n\u003c\/p\u003e\n\u003cp\u003e\n • 825031C\n\u003c\/p\u003e\n\u003cp\u003e\n • 10-88348935 related M6 x 35 screw\n\u003c\/p\u003e\n\u003cp\u003e\n • 8M0241960 related later screw reference\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Yamaha Cross-Referenced Numbers:\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha: 6H3-12413-00-00\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha: 6H3-12413-00-1S\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha: 6H3-12413-00-94\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha: 6H3-12413-00-9M\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha: 6H3-12413\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 • Outboard Spares: OSTC6H3 equivalent\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 \/ Mariner FourStroke thermostat cover applications\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha-sourced small and mid-range FourStroke thermostat cover applications where specified\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 8HP FourStroke - serial 0P086824 to 0P400999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 9.9HP FourStroke - serial 0G760300 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 9.9HP FourStroke - serial 0P075166 to 0P400999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 13.5HP FourStroke - serial 0P134638 to 0P400999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 13.5HP FourStroke - serial 0P401000 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 15HP FourStroke - serial 0G760300 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 15HP FourStroke - serial 0P075166 to 0P400999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 15HP FourStroke - serial 0P401000 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 15HP FourStroke - serial 1B227000 to 1B727495\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 25HP FourStroke - serial 0P153500 to 0P388282\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 25HP FourStroke - serial 0T409000 to 1B344298\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 30HP FourStroke - serial 0P153500 to 0P400999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 30HP FourStroke - serial 0T409000 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 30HP FourStroke - serial 1C456300 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 30HP EFI 3-cylinder FourStroke - serial 0P153500 to 0P400999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 30HP EFI 3-cylinder FourStroke - serial 0T409000 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 30HP EFI 3-cylinder FourStroke - serial 1C109093 to 1C456299\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 30HP EFI 3-cylinder FourStroke - serial 1C456300 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 35HP EFI Jet 4-cylinder FourStroke - serial 1C453840 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP FourStroke - serial 0P153500 to 0P400999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP FourStroke - serial 0P401000 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP FourStroke - serial 0T409000 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP FourStroke - serial 1B227000 to 1B344306\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP FourStroke - serial 1C000001 to 1C018825\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP FourStroke - serial 1C018826 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 3-cylinder FourStroke - serial 0P153500 to 0P400999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 3-cylinder FourStroke - serial 0P401000 to 0P515896\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 3-cylinder FourStroke - serial 0T409000 to 1B226999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 3-cylinder FourStroke - serial 1B227000 to 1B355027\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 3-cylinder FourStroke - serial 1C000001 to 1C043416\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 3-cylinder FourStroke - serial 1C043417 to 1C456299\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 3-cylinder FourStroke - serial 1C456300 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 4-cylinder FourStroke - serial 0P153500 to 0P400999\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 4-cylinder FourStroke - serial 0P401000 to 0P515896\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 4-cylinder FourStroke - serial 0T409000 to 1B355222\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 4-cylinder FourStroke - serial 1C000001 to 1C050251\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 4-cylinder FourStroke - serial 1C050252 to 1C453839\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI 4-cylinder FourStroke - serial 1C453840 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI Jet 4-cylinder FourStroke - serial 1C051324 to 1C453839\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI Jet 4-cylinder FourStroke - serial 1C453840 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 40HP EFI SeaPro 4-cylinder FourStroke - serial 1C453840 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 50HP EFI 4-cylinder FourStroke - serial 1C453840 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 60HP EFI 4-cylinder FourStroke - serial 1C453840 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 60HP EFI SeaPro FourStroke - serial 1C453840 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury Formula 60 - serial 1C104574 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 60R EFI Racing FourStroke - serial 1C615064 and up\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha F9.9 \/ F15 \/ F20 \/ F25 \/ F30 \/ F40 \/ F45 \/ F50 \/ F60 \/ F70 applications where Yamaha 6H3-12413 thermostat cover family is specified\n\u003c\/p\u003e\n\u003cp\u003e\n • Yamaha 50G \/ 60F \/ 70B 2-stroke applications where Yamaha 6H3 thermostat cover family is specified\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • HP Range: Mercury \/ Mariner 8HP - 60HP FourStroke where specified, plus Yamaha 9.9HP - 70HP applications where specified\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine Type: Mercury \/ Mariner FourStroke outboard and selected Yamaha outboard applications\n\u003c\/p\u003e\n\u003cp\u003e\n • System Type: Thermostat housing cover \/ cooling system cover\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 thermostat cover seals the thermostat cavity and helps maintain correct cooling system flow through the thermostat housing.\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 leak around thermostat cover\n\u003c\/p\u003e\n\u003cp\u003e\n • Cracked or corroded cover\n\u003c\/p\u003e\n\u003cp\u003e\n • Thermostat gasket will not seal correctly\n\u003c\/p\u003e\n\u003cp\u003e\n • Overheating or cooling-system pressure loss\n\u003c\/p\u003e\n\u003cp\u003e\n • Damaged cover during thermostat 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":53388151947556,"sku":"8M0008243","price":14.35,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/8115\/7924\/files\/original_538794f4-6aaa-4d6f-bbe3-ba916b617a67.png?v=1777212287","url":"https:\/\/www.sawleysautoandmarine.com.au\/products\/8m0008243-mercury-mercruiser-mercury-thermostat-cover-genuine-quicksilver-oem-part","provider":"Sawley's Auto and Marine","version":"1.0","type":"link"}