{"product_id":"804540-mercury-mercruiser-thermostat-genuine-quicksilver-oem-part","title":"804540 Mercury MerCruiser Thermostat | 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 - Part Number: 804540\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n Genuine Quicksilver\/Mercury thermostat for selected Mercury and Mariner small outboard cooling systems. This OEM thermostat is used across specific small carburetted and international two-cylinder outboard applications and has been superseded through later Mercury thermostat service references.\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n ⚙️ Key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\/Mercury OEM thermostat\n\u003c\/p\u003e\n\u003cp\u003e\n • Used on selected Mercury \/ Mariner small outboard cooling systems\n\u003c\/p\u003e\n\u003cp\u003e\n • Supersedes through later 8M0228411 \/ 8M0228413 service references\n\u003c\/p\u003e\n\u003cp\u003e\n • Helps regulate engine operating temperature\n\u003c\/p\u003e\n\u003cp\u003e\n • Direct replacement for 804540 \/ 853704 \/ 803665 thermostat family applications\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 • 8M0228413 → Supersedes 8M0228411\n\u003c\/p\u003e\n\u003cp\u003e\n • 8M0228411 → Supersedes 804540\n\u003c\/p\u003e\n\u003cp\u003e\n • 804540 → Supersedes 853704\n\u003c\/p\u003e\n\u003cp\u003e\n • 853704 → Supersedes 803665\n\u003c\/p\u003e\n\u003cp\u003e\n • 803665 earlier OEM 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 • 804540\n\u003c\/p\u003e\n\u003cp\u003e\n • 853704\n\u003c\/p\u003e\n\u003cp\u003e\n • 803665\n\u003c\/p\u003e\n\u003cp\u003e\n • 8M0228411\n\u003c\/p\u003e\n\u003cp\u003e\n • 8M0228413\n\u003c\/p\u003e\n\u003cp\u003e\n • Tohatsu: 350-01030-2\n\u003c\/p\u003e\n\u003cp\u003e\n • Tohatsu: 350-01030-1\n\u003c\/p\u003e\n\u003cp\u003e\n • Tohatsu: 350-01030-0\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 • REC: REC804540\n\u003c\/p\u003e\n\u003cp\u003e\n • Aftermarket thermostat equivalents available under Tohatsu 350-01030 family where matched by application\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 small outboard cylinder block thermostat applications\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury \/ Tohatsu-built small outboard cooling systems\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 small carburetted 2HP-6HP models where 804540 thermostat family is specified\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 4HP Carb 4-Stroke, serial range 0R067090 - 0R411837\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 25HP 2-Cylinder International, serial range 0N018456 - 0N055504\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury 30HP 2-Cylinder International, serial range 0N001875 - 0N055504\n\u003c\/p\u003e\n\u003cp\u003e\n • Mercury \/ Mariner small outboard applications where the cylinder block parts diagram specifies 804540, 853704, 803665, 8M0228411 or 8M0228413\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n • HP Range: 2HP - 30HP where specified by parts diagram\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine Type: Mercury \/ Mariner small outboard cooling-system thermostat\n\u003c\/p\u003e\n\u003cp\u003e\n • Year Range: Application dependent by 0N \/ 0R serial range and model family\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 controls cooling-water circulation so the engine can warm up correctly and maintain a stable operating temperature. A correct thermostat helps prevent overcooling, overheating, poor running and temperature fluctuation.\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 • Engine overheating warning\n\u003c\/p\u003e\n\u003cp\u003e\n • Engine running too cold\n\u003c\/p\u003e\n\u003cp\u003e\n • Slow warm-up\n\u003c\/p\u003e\n\u003cp\u003e\n • Thermostat stuck open or closed\n\u003c\/p\u003e\n\u003cp\u003e\n • Salt or scale deposits around thermostat\n\u003c\/p\u003e\n\u003cp\u003e\n • Poor idle or inconsistent running temperature\n\u003c\/p\u003e\n\u003cp\u003e\n • Reduced cooling-system performance\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":53388156928292,"sku":"804540","price":82.8,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/8115\/7924\/files\/original_23d2a2b9-4359-4197-ab4d-a31373020bbf.jpg?v=1777212517","url":"https:\/\/www.sawleysautoandmarine.com.au\/products\/804540-mercury-mercruiser-thermostat-genuine-quicksilver-oem-part","provider":"Sawley's Auto and Marine","version":"1.0","type":"link"}