{"product_id":"sierra-18-1507-thermostat-seal-replaces-omc-335981-fits-evinrude-johnson-60-degree-v-4-v-6-outboards","title":"Sierra 143 Degree Marine Thermostat, Replaces 436195, Part Number 18-1507","description":"\u003cp\u003eThe Sierra 18-1507 is a 143 degree F marine engine thermostat, engineered as a direct replacement for outboard and sterndrive cooling systems that call for a 143 degree opening temperature. The thermostat regulates coolant flow through the engine block, staying closed until the powerhead reaches its designed operating temperature and then opening to allow water flow to the cooling passages. Maintaining the correct opening temperature is critical for marine engines: running too cool can lead to poor combustion and increased wear, while a failed or stuck thermostat can cause overheating and serious engine damage.\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 18-1507\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 143 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282167127\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 436195\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned as a direct fit for engines specifying a 143 degree F opening thermostat.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e436195\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature does the Sierra 18-1507 thermostat open at?\u003c\/strong\u003e The Sierra 18-1507 opens at 143 degrees F, which is the rated temperature stamped for this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-1507 replace?\u003c\/strong\u003e It replaces OEM number 436195, so it can be used as a direct substitute for that original thermostat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this thermostat weigh?\u003c\/strong\u003e The Sierra 18-1507 thermostat weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many thermostats come in a package?\u003c\/strong\u003e Each Sierra 18-1507 package contains a single thermostat unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1507 a genuine Sierra part or aftermarket?\u003c\/strong\u003e It is a Sierra-branded thermostat manufactured under Sierra's own part number, 18-1507.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this part?\u003c\/strong\u003e The Sierra 18-1507 thermostat carries UPC 808282167127.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if a marine thermostat like the 18-1507 fails?\u003c\/strong\u003e A stuck or failed thermostat can prevent proper coolant flow, leading to engine overheating or, if stuck open, slower warm-up and reduced efficiency, which is why matching the correct 143 degree rating for part 18-1507 matters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use a different temperature rated thermostat instead of the 143 degree 18-1507?\u003c\/strong\u003e The 18-1507 is specifically rated at 143 degrees F, and using a different opening temperature than the engine manufacturer specifies is not recommended since it changes engine warm-up and operating temperature behavior.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1507 include a gasket or seal?\u003c\/strong\u003e The listing for part 18-1507 covers the thermostat itself; a separate thermostat seal (such as Sierra 18-1734 or 18-1506) may be needed depending on the engine application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if 18-1507 is the right thermostat for my engine?\u003c\/strong\u003e Confirm your engine calls for a 143 degree F thermostat or originally used OEM part 436195, since Sierra 18-1507 is built to that specification.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087812315,"sku":"SIE-18-1507","price":5.39,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1507_lg__71663.1558121453.500.750.jpg?v=1785189093","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-1507-thermostat-seal-replaces-omc-335981-fits-evinrude-johnson-60-degree-v-4-v-6-outboards","provider":"Good Vibes Marina","version":"1.0","type":"link"}