{"product_id":"mercury-outboard-thermostat-120f-8m0117413","title":"Mercury Outboard Thermostat 120°F – 8M0117413","description":"\u003cp data-start=\"217\" data-end=\"374\"\u003eThe \u003cstrong data-start=\"221\" data-end=\"267\"\u003eMercury \/ Quicksilver 8M0117413 Thermostat\u003c\/strong\u003e is a genuine OEM \u003cstrong data-start=\"285\" data-end=\"314\"\u003e120°F (48.8°C) thermostat\u003c\/strong\u003e used on small-to-mid horsepower Mercury 4-stroke outboards.\u003c\/p\u003e\n\u003cp data-start=\"376\" data-end=\"676\"\u003eThis thermostat regulates engine temperature in \u003cstrong data-start=\"424\" data-end=\"452\"\u003eraw water cooled systems\u003c\/strong\u003e, allowing the engine to warm up quickly while preventing overheating under load. The lower \u003cstrong data-start=\"544\" data-end=\"560\"\u003e120°F rating\u003c\/strong\u003e is specific to these engines and is required for proper fuel mapping, combustion efficiency, and corrosion control.\u003c\/p\u003e\n\u003cp data-start=\"678\" data-end=\"926\"\u003eIt uses a \u003cstrong data-start=\"688\" data-end=\"709\"\u003ewax-element valve\u003c\/strong\u003e that opens progressively with temperature, ensuring stable cooling performance across idle and high RPM operation. Built to OEM standards, it provides reliable operation in both freshwater and saltwater environments.\u003c\/p\u003e\n\u003chr data-start=\"928\" data-end=\"931\"\u003e\n\u003ch2 data-start=\"933\" data-end=\"952\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"936\" data-end=\"952\"\u003eKey Features\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"953\" data-end=\"1241\"\u003e\n\u003cli data-start=\"953\" data-end=\"995\"\u003eGenuine Mercury \/ Quicksilver OEM part\u003c\/li\u003e\n\u003cli data-start=\"996\" data-end=\"1037\"\u003e\n\u003cstrong data-start=\"998\" data-end=\"1016\"\u003e120°F (48.8°C)\u003c\/strong\u003e temperature rating\u003c\/li\u003e\n\u003cli data-start=\"1038\" data-end=\"1085\"\u003eDesigned for \u003cstrong data-start=\"1053\" data-end=\"1083\"\u003eraw water cooled outboards\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1086\" data-end=\"1128\"\u003eMaintains proper operating temperature\u003c\/li\u003e\n\u003cli data-start=\"1129\" data-end=\"1177\"\u003ePrevents overheating and cold-running issues\u003c\/li\u003e\n\u003cli data-start=\"1178\" data-end=\"1214\"\u003eCorrosion-resistant construction\u003c\/li\u003e\n\u003cli data-start=\"1215\" data-end=\"1241\"\u003eDirect OEM replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1243\" data-end=\"1246\"\u003e\n\u003ch2 data-start=\"1248\" data-end=\"1275\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1251\" data-end=\"1275\"\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 data-start=\"1277\" data-end=\"1321\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1281\" data-end=\"1321\"\u003eMercury \/ Mariner 4-Stroke Outboards\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1322\" data-end=\"1327\"\u003eFits:\u003c\/p\u003e\n\u003cul data-start=\"1328\" data-end=\"1443\"\u003e\n\u003cli data-start=\"1328\" data-end=\"1356\"\u003e\u003cstrong data-start=\"1330\" data-end=\"1354\"\u003e35 HP EFI (4-stroke)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"1357\" data-end=\"1385\"\u003e\u003cstrong data-start=\"1359\" data-end=\"1383\"\u003e40 HP EFI (4-stroke)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"1386\" data-end=\"1414\"\u003e\u003cstrong data-start=\"1388\" data-end=\"1412\"\u003e50 HP EFI (4-stroke)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"1415\" data-end=\"1443\"\u003e\u003cstrong data-start=\"1417\" data-end=\"1441\"\u003e60 HP EFI (4-stroke)\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1445\" data-end=\"1479\"\u003e➡️ Typically applies to engines:\u003c\/p\u003e\n\u003cul data-start=\"1480\" data-end=\"1558\"\u003e\n\u003cli data-start=\"1480\" data-end=\"1558\"\u003e\n\u003cstrong data-start=\"1482\" data-end=\"1518\"\u003eSerial range: 1C453840 and newer\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1560\" data-end=\"1573\"\u003e➡️ Common on:\u003c\/p\u003e\n\u003cul data-start=\"1574\" data-end=\"1685\"\u003e\n\u003cli data-start=\"1574\" data-end=\"1610\"\u003eMercury 4-cylinder EFI platforms\u003c\/li\u003e\n\u003cli data-start=\"1611\" data-end=\"1685\"\u003eSeaPro variants in same HP range \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1687\" data-end=\"1690\"\u003e\n\u003ch2 data-start=\"1692\" data-end=\"1722\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1695\" data-end=\"1722\"\u003eImportant Fitment Notes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"1723\" data-end=\"1943\"\u003e\n\u003cli data-start=\"1723\" data-end=\"1758\"\u003e✔ Raw water cooled systems only\u003c\/li\u003e\n\u003cli data-start=\"1759\" data-end=\"1799\"\u003e✔ Must match OEM temp rating (120°F)\u003c\/li\u003e\n\u003cli data-start=\"1800\" data-end=\"1854\"\u003e❌ Not interchangeable with 140° \/ 160° thermostats\u003c\/li\u003e\n\u003cli data-start=\"1855\" data-end=\"1943\"\u003e✔ Superseded by \u003cstrong data-start=\"1873\" data-end=\"1886\"\u003e8M0168892\u003c\/strong\u003e (updated design) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1945\" data-end=\"1948\"\u003e\n\u003ch2 data-start=\"1950\" data-end=\"1971\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1953\" data-end=\"1971\"\u003eSpecifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"1972\" data-end=\"2176\"\u003e\n\u003cli data-start=\"1972\" data-end=\"2002\"\u003ePart Number: \u003cstrong data-start=\"1987\" data-end=\"2000\"\u003e8M0117413\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2003\" data-end=\"2035\"\u003eSuperseded By: \u003cstrong data-start=\"2020\" data-end=\"2033\"\u003e8M0168892\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2036\" data-end=\"2078\"\u003eTemperature Rating: \u003cstrong data-start=\"2058\" data-end=\"2076\"\u003e120°F (48.8°C)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2079\" data-end=\"2106\"\u003eType: Engine thermostat\u003c\/li\u003e\n\u003cli data-start=\"2107\" data-end=\"2143\"\u003eCooling System: Raw water cooled\u003c\/li\u003e\n\u003cli data-start=\"2144\" data-end=\"2176\"\u003eOperation: Wax-element valve\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2178\" data-end=\"2181\"\u003e\n\u003ch2 data-start=\"2183\" data-end=\"2205\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2186\" data-end=\"2205\"\u003eWhat’s Included\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2206\" data-end=\"2265\"\u003e\n\u003cli data-start=\"2206\" data-end=\"2265\"\u003eThermostat (gasket\/seal sold separately unless specified)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2267\" data-end=\"2270\"\u003e\n\u003ch2 data-start=\"2272\" data-end=\"2311\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2275\" data-end=\"2311\"\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2312\" data-end=\"2460\"\u003e\n\u003cli data-start=\"2312\" data-end=\"2334\"\u003eEngine overheating\u003c\/li\u003e\n\u003cli data-start=\"2335\" data-end=\"2362\"\u003eEngine running too cold\u003c\/li\u003e\n\u003cli data-start=\"2363\" data-end=\"2390\"\u003eTemperature fluctuation\u003c\/li\u003e\n\u003cli data-start=\"2391\" data-end=\"2431\"\u003eDebris or corrosion causing sticking\u003c\/li\u003e\n\u003cli data-start=\"2432\" data-end=\"2460\"\u003eRoutine service interval\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2462\" data-end=\"2465\"\u003e\n\u003ch2 data-start=\"2467\" data-end=\"2492\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2470\" data-end=\"2492\"\u003eInstallation Notes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-start=\"2493\" data-end=\"2675\"\u003e\n\u003cli data-start=\"2493\" data-end=\"2552\"\u003eInstall with correct orientation (spring toward engine)\u003c\/li\u003e\n\u003cli data-start=\"2553\" data-end=\"2590\"\u003eInspect and replace seals\/gaskets\u003c\/li\u003e\n\u003cli data-start=\"2591\" data-end=\"2628\"\u003eCheck cooling passages for debris\u003c\/li\u003e\n\u003cli data-start=\"2629\" data-end=\"2675\"\u003eVerify operating temperature after install\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2677\" data-end=\"2680\"\u003e\n\u003ch2 data-start=\"2682\" data-end=\"2724\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2685\" data-end=\"2724\"\u003eAlternate \/ Superseded Part Numbers\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 data-start=\"2726\" data-end=\"2754\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2730\" data-end=\"2754\"\u003eOEM Cross References\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-start=\"2755\" data-end=\"2852\"\u003e\n\u003cli data-start=\"2755\" data-end=\"2795\"\u003eMercury \/ Quicksilver: \u003cstrong data-start=\"2780\" data-end=\"2793\"\u003e8M0117413\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2796\" data-end=\"2828\"\u003eSupersedes to: \u003cstrong data-start=\"2813\" data-end=\"2826\"\u003e8M0168892\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2829\" data-end=\"2852\"\u003eSierra: \u003cstrong data-start=\"2839\" data-end=\"2850\"\u003e18-3640\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2854\" data-end=\"2857\"\u003e\n\u003ch2 data-start=\"2859\" data-end=\"2876\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2862\" data-end=\"2874\"\u003eShipping\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2877\" data-end=\"2944\"\u003eShipping: Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e\n\u003chr data-start=\"2946\" data-end=\"2949\"\u003e\n\u003ch3 data-start=\"2951\" data-end=\"2978\"\u003e💡 Parts Desk Insight\u003c\/h3\u003e\n\u003cp data-start=\"2979\" data-end=\"3142\"\u003eThese smaller EFI Mercs are \u003cstrong data-start=\"3007\" data-end=\"3044\"\u003every sensitive to thermostat temp\u003c\/strong\u003e—installing the wrong rating (like 140°) will throw off fuel mapping and cause poor performance 👍\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563915608100,"sku":"8M0117413","price":40.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/2b9ea263-32f9-4dd7-8b1b-48baf50d9924.png?v=1773369677","url":"https:\/\/marisolmarine.com\/products\/mercury-outboard-thermostat-120f-8m0117413","provider":"Marisol Marine Company","version":"1.0","type":"link"}