{"product_id":"mercury-outboard-thermostat-assembly-120f-8m0090819","title":"Mercury Outboard Thermostat Assembly 120°F – 8M0090819","description":"\u003cp data-start=\"234\" data-end=\"401\"\u003eThe \u003cstrong data-start=\"238\" data-end=\"293\"\u003eMercury \/ Quicksilver 8M0090819 Thermostat Assembly\u003c\/strong\u003e is a genuine OEM \u003cstrong data-start=\"311\" data-end=\"355\"\u003e120°F thermostat with integrated housing\u003c\/strong\u003e, designed for Mercury EFI 4-stroke outboards.\u003c\/p\u003e\n\u003cp data-start=\"403\" data-end=\"743\"\u003eUnlike a standard thermostat, this is a \u003cstrong data-start=\"443\" data-end=\"464\"\u003ecomplete assembly\u003c\/strong\u003e that includes both the thermostat and its housing, ensuring proper sealing, alignment, and coolant flow. It regulates engine temperature by controlling water flow through the powerhead, allowing the engine to warm up quickly and maintain stable operating temperature under load.\u003c\/p\u003e\n\u003cp data-start=\"745\" data-end=\"1027\"\u003eThe \u003cstrong data-start=\"749\" data-end=\"770\"\u003e120°F calibration\u003c\/strong\u003e is critical for these engines, supporting proper fuel mapping, combustion efficiency, and corrosion control in raw water cooling systems. Built to Mercury Marine specifications, it provides consistent thermal response, long service life, and exact fitment.\u003c\/p\u003e\n\u003chr data-start=\"1029\" data-end=\"1032\"\u003e\n\u003ch2 data-start=\"1034\" data-end=\"1053\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1037\" data-end=\"1053\"\u003eKey Features\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"1054\" data-end=\"1377\"\u003e\n\u003cli data-start=\"1054\" data-end=\"1100\"\u003eGenuine Mercury \/ Quicksilver OEM assembly\u003c\/li\u003e\n\u003cli data-start=\"1101\" data-end=\"1140\"\u003e\n\u003cstrong data-start=\"1103\" data-end=\"1119\"\u003e120°F (49°C)\u003c\/strong\u003e temperature rating\u003c\/li\u003e\n\u003cli data-start=\"1141\" data-end=\"1180\"\u003eComplete unit: thermostat + housing\u003c\/li\u003e\n\u003cli data-start=\"1181\" data-end=\"1228\"\u003eDesigned for \u003cstrong data-start=\"1196\" data-end=\"1226\"\u003eraw water cooled outboards\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1229\" data-end=\"1278\"\u003eMaintains proper engine operating temperature\u003c\/li\u003e\n\u003cli data-start=\"1279\" data-end=\"1323\"\u003eEnsures correct coolant flow and sealing\u003c\/li\u003e\n\u003cli data-start=\"1324\" data-end=\"1377\"\u003eDirect OEM replacement (no modification required)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1379\" data-end=\"1382\"\u003e\n\u003ch2 data-start=\"1384\" data-end=\"1411\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1387\" data-end=\"1411\"\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 data-start=\"1413\" data-end=\"1467\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1417\" data-end=\"1467\"\u003eMercury 4-Stroke EFI Outboards (2.1L Platform)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1468\" data-end=\"1473\"\u003eFits:\u003c\/p\u003e\n\u003cul data-start=\"1474\" data-end=\"1545\"\u003e\n\u003cli data-start=\"1474\" data-end=\"1487\"\u003e\u003cstrong data-start=\"1476\" data-end=\"1485\"\u003e75 HP\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"1488\" data-end=\"1501\"\u003e\u003cstrong data-start=\"1490\" data-end=\"1499\"\u003e80 HP\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"1502\" data-end=\"1515\"\u003e\u003cstrong data-start=\"1504\" data-end=\"1513\"\u003e90 HP\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"1516\" data-end=\"1530\"\u003e\u003cstrong data-start=\"1518\" data-end=\"1528\"\u003e100 HP\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"1531\" data-end=\"1545\"\u003e\u003cstrong data-start=\"1533\" data-end=\"1543\"\u003e115 HP\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1547\" data-end=\"1563\"\u003e➡️ Also used on:\u003c\/p\u003e\n\u003cul data-start=\"1564\" data-end=\"1650\"\u003e\n\u003cli data-start=\"1564\" data-end=\"1585\"\u003eEFI SeaPro models\u003c\/li\u003e\n\u003cli data-start=\"1586\" data-end=\"1650\"\u003eEFI Jet drive variants \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1652\" data-end=\"1668\"\u003e➡️ Designed for:\u003c\/p\u003e\n\u003cul data-start=\"1669\" data-end=\"1753\"\u003e\n\u003cli data-start=\"1669\" data-end=\"1753\"\u003e\n\u003cstrong data-start=\"1671\" data-end=\"1713\"\u003e2.1L 4-cylinder EFI FourStroke engines\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1755\" data-end=\"1758\"\u003e\n\u003ch2 data-start=\"1760\" data-end=\"1790\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1763\" data-end=\"1790\"\u003eImportant Fitment Notes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"1791\" data-end=\"2032\"\u003e\n\u003cli data-start=\"1791\" data-end=\"1826\"\u003e✔ Raw water cooled systems only\u003c\/li\u003e\n\u003cli data-start=\"1827\" data-end=\"1879\"\u003e✔ Must match \u003cstrong data-start=\"1842\" data-end=\"1856\"\u003e120°F spec\u003c\/strong\u003e for proper operation\u003c\/li\u003e\n\u003cli data-start=\"1880\" data-end=\"1958\"\u003e❌ Not compatible with Verado engines \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1959\" data-end=\"2032\"\u003e✔ Includes housing – not interchangeable with thermostat-only designs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2034\" data-end=\"2037\"\u003e\n\u003ch2 data-start=\"2039\" data-end=\"2060\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2042\" data-end=\"2060\"\u003eSpecifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2061\" data-end=\"2316\"\u003e\n\u003cli data-start=\"2061\" data-end=\"2091\"\u003ePart Number: \u003cstrong data-start=\"2076\" data-end=\"2089\"\u003e8M0090819\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2092\" data-end=\"2132\"\u003eTemperature Rating: \u003cstrong data-start=\"2114\" data-end=\"2130\"\u003e120°F (49°C)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2133\" data-end=\"2177\"\u003eType: Thermostat assembly (with housing)\u003c\/li\u003e\n\u003cli data-start=\"2178\" data-end=\"2214\"\u003eCooling System: Raw water cooled\u003c\/li\u003e\n\u003cli data-start=\"2215\" data-end=\"2261\"\u003eEngine Platform: Mercury 2.1L EFI 4-stroke\u003c\/li\u003e\n\u003cli data-start=\"2262\" data-end=\"2316\"\u003eConstruction: Marine-grade composite\/metal housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2318\" data-end=\"2321\"\u003e\n\u003ch2 data-start=\"2323\" data-end=\"2345\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2326\" data-end=\"2345\"\u003eWhat’s Included\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2346\" data-end=\"2392\"\u003e\n\u003cli data-start=\"2346\" data-end=\"2360\"\u003eThermostat\u003c\/li\u003e\n\u003cli data-start=\"2361\" data-end=\"2392\"\u003eThermostat housing assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2394\" data-end=\"2397\"\u003e\n\u003ch2 data-start=\"2399\" data-end=\"2438\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2402\" data-end=\"2438\"\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2439\" data-end=\"2637\"\u003e\n\u003cli data-start=\"2439\" data-end=\"2476\"\u003eEngine overheating or running hot\u003c\/li\u003e\n\u003cli data-start=\"2477\" data-end=\"2517\"\u003eEngine running too cold (stuck open)\u003c\/li\u003e\n\u003cli data-start=\"2518\" data-end=\"2557\"\u003eCoolant leaks at thermostat housing\u003c\/li\u003e\n\u003cli data-start=\"2558\" data-end=\"2592\"\u003eCorrosion or damage to housing\u003c\/li\u003e\n\u003cli data-start=\"2593\" data-end=\"2637\"\u003eRoutine maintenance on high-hour engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2639\" data-end=\"2642\"\u003e\n\u003ch2 data-start=\"2644\" data-end=\"2669\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2647\" data-end=\"2669\"\u003eInstallation Notes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2670\" data-end=\"2870\"\u003e\n\u003cli data-start=\"2670\" data-end=\"2731\"\u003eReplace as a complete assembly (do not reuse old housing)\u003c\/li\u003e\n\u003cli data-start=\"2732\" data-end=\"2770\"\u003eInspect sealing surfaces and hoses\u003c\/li\u003e\n\u003cli data-start=\"2771\" data-end=\"2816\"\u003eTorque evenly to avoid housing distortion\u003c\/li\u003e\n\u003cli data-start=\"2817\" data-end=\"2870\"\u003eVerify proper operating temperature after install\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2872\" data-end=\"2875\"\u003e\n\u003ch2 data-start=\"2877\" data-end=\"2919\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2880\" data-end=\"2919\"\u003eAlternate \/ Superseded Part Numbers\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 data-start=\"2921\" data-end=\"2949\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2925\" data-end=\"2949\"\u003eOEM Cross References\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-start=\"2950\" data-end=\"3061\"\u003e\n\u003cli data-start=\"2950\" data-end=\"2990\"\u003eMercury \/ Quicksilver: \u003cstrong data-start=\"2975\" data-end=\"2988\"\u003e8M0090819\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2991\" data-end=\"3061\"\u003eSuperseded by: \u003cstrong data-start=\"3008\" data-end=\"3021\"\u003e8M0204728\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3063\" data-end=\"3066\"\u003e\n\u003ch2 data-start=\"3068\" data-end=\"3085\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3071\" data-end=\"3083\"\u003eShipping\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3086\" data-end=\"3153\"\u003eShipping: Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e\n\u003chr data-start=\"3155\" data-end=\"3158\"\u003e\n\u003ch3 data-start=\"3160\" data-end=\"3187\"\u003e💡 Parts Desk Insight\u003c\/h3\u003e\n\u003cp data-start=\"3188\" data-end=\"3339\"\u003eIf you’re seeing leaks around the thermostat area, \u003cstrong data-start=\"3239\" data-end=\"3293\"\u003ereplace the whole assembly—not just the thermostat\u003c\/strong\u003e. These housings warp and corrode over time 👍\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563914231844,"sku":"8M0090819","price":144.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/084db6e6-7840-4f32-8b32-c710ebf0b0da.png?v=1773424662","url":"https:\/\/marisolmarine.com\/products\/mercury-outboard-thermostat-assembly-120f-8m0090819","provider":"Marisol Marine Company","version":"1.0","type":"link"}