{"product_id":"sierra-18-3561-marine-thermostat-143f-replaces-oem-436195-for-evinrude-johnson-outboards","title":"Sierra 18-3561 Thermostat 105 Degree - Replaces 384719 - Fits Most 3 and 4 Cyl. Outboards 1985-90","description":"\u003cp\u003eThe Sierra 18-3561 is a 105 degree F thermostat built as a direct replacement for outboard engine cooling systems. It regulates coolant flow through the powerhead, opening at its rated temperature to maintain consistent operating temperature and protect the engine from overheating or running too cold. This thermostat fits most 3 and 4 cylinder outboard engines from 1985-90 and is a direct replacement for OEM part number 384719.\u003c\/p\u003e\u003cp\u003eInstalling the correct thermostat is essential for reliable engine performance. A thermostat that fails to open can cause overheating and engine damage, while one that fails to close can prevent the engine from reaching proper operating temperature, leading to poor fuel combustion and increased wear. The Sierra 18-3561 is manufactured to meet or exceed the specifications of the original equipment part it replaces, giving boat owners a dependable option when replacing a worn, stuck, or failed thermostat during routine maintenance.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3561\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 105 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 384719\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Fits most 3 and 4 cylinder outboard engines, 1985-90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999753656\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMost 3 and 4 cylinder outboard engines, 1985-90\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e384719\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature does the Sierra 18-3561 thermostat open at?\u003c\/strong\u003e The Sierra 18-3561 thermostat is rated to open at 105 degrees F, allowing coolant to begin circulating through the powerhead once that temperature is reached.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-3561 thermostat fit?\u003c\/strong\u003e This thermostat fits most 3 and 4 cylinder outboard engines built from 1985-90.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3561 a direct replacement for the original equipment thermostat?\u003c\/strong\u003e Yes, the Sierra 18-3561 is a direct replacement for OEM part number 384719 and is designed to meet or exceed the performance of the original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 18-3561 thermostat made of?\u003c\/strong\u003e The Sierra 18-3561 thermostat is constructed of brass with a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3561 thermostat weigh?\u003c\/strong\u003e The Sierra 18-3561 thermostat weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my outboard thermostat needs to be replaced?\u003c\/strong\u003e Signs that an outboard thermostat like the Sierra 18-3561 needs replacement include the engine running hot, overheating alarms, or the engine taking unusually long to reach normal operating temperature.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the Sierra 18-3561 myself?\u003c\/strong\u003e The Sierra 18-3561 thermostat is a standard replacement part designed to install in place of the original 384719 thermostat using the same mounting location in the powerhead cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3561 come with a gasket or seal?\u003c\/strong\u003e The listing for the Sierra 18-3561 covers the thermostat itself; check your engine's cooling system for the correct matching gasket or housing seal when replacing it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does thermostat temperature rating matter on an outboard engine?\u003c\/strong\u003e A thermostat's temperature rating, such as the 105 degree F rating on the 18-3561, determines when coolant begins flowing to regulate engine temperature; using the wrong rating can cause the engine to run too hot or too cold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3561 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The Sierra 18-3561 is manufactured by Sierra as a replacement part for OEM number 384719, engineered to meet or exceed original equipment specifications.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988153807067,"sku":"SIE-18-3561","price":15.2,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3561_lg__47578.1558127256.500.750.jpg?v=1785188216","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3561-marine-thermostat-143f-replaces-oem-436195-for-evinrude-johnson-outboards","provider":"Good Vibes Marina","version":"1.0","type":"link"}