{"product_id":"sierra-18-3667-marine-thermostat-kit-160f-replaces-mercruiser-thermostat-99155a1-gasket-27-89656-1-fits-mercruiser-stern-drive","title":"Sierra 18-3667 Marine Thermostat Kit, 160 Degree, White, for Mercruiser Stern Drive","description":"\u003cp\u003eThe Sierra 18-3667 Marine Thermostat Kit is a complete replacement kit built for Mercruiser stern drive engines. Rather than sourcing a thermostat and gasket separately, this kit bundles both components so the cooling system repair can be completed in a single job. The kit includes a 160 degree thermostat (Sierra 18-3555, OE# 99155A1) that regulates engine coolant temperature to keep the engine operating in its proper range, along with a matching thermostat cover gasket (Sierra 18-2555, OE# 27-89656-1) that seals the thermostat housing to prevent coolant leaks after installation.\u003c\/p\u003e\u003cp\u003eSierra engineers its cooling system parts to meet or exceed the specifications of the original equipment they replace, and this kit is manufactured to the same standard for reliable, drop-in service on Mercruiser stern drive applications. The thermostat kit is finished in white and is sold as a matched set so both wear parts are replaced together, reducing the chance of a repeat leak or overheating issue from reusing an old gasket alongside a new thermostat.\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 18-3667\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Type:\u003c\/strong\u003e Thermostat Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Thermostat (Sierra 18-3555, OE# 99155A1); Thermostat Cover Gasket (Sierra 18-2555, OE# 27-89656-1)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 160 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercruiser Stern Drive\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999316301\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.16 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGLM 13420\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-3667 Thermostat Kit?\u003c\/strong\u003e The Sierra 18-3667 kit includes a 160 degree thermostat (Sierra 18-3555) and a matching thermostat cover gasket (Sierra 18-2555), so both wear parts can be replaced together in one job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature rating is the thermostat in kit 18-3667?\u003c\/strong\u003e It is rated at 160 degrees Fahrenheit, which sets the coolant temperature at which the thermostat opens to regulate engine cooling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the 18-3667 thermostat kit fit?\u003c\/strong\u003e The Sierra 18-3667 Thermostat Kit is designed for Mercruiser stern drive engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part does the 18-3667 kit cross-reference to?\u003c\/strong\u003e The Sierra 18-3667 Thermostat Kit is interchangeable with GLM 13420.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-3667 thermostat kit?\u003c\/strong\u003e The kit is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3667 kit weigh?\u003c\/strong\u003e This thermostat kit weighs 0.16 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to buy the gasket separately when replacing the thermostat?\u003c\/strong\u003e No, the Sierra 18-3667 kit already includes both the 18-3555 thermostat and the 18-2555 thermostat cover gasket, so no separate gasket purchase is needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3667 kit genuine Sierra or aftermarket?\u003c\/strong\u003e It is a genuine Sierra part, manufactured to meet or exceed the original equipment specifications for Mercruiser stern drive cooling systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3667 Thermostat Kit?\u003c\/strong\u003e The UPC for this Sierra thermostat kit is 030999316301.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy replace the thermostat and gasket together instead of just the thermostat?\u003c\/strong\u003e Replacing both components in the Sierra 18-3667 kit at the same time helps prevent a coolant leak from an old, worn gasket after a new thermostat has been installed.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988157280475,"sku":"SIE-18-3667","price":23.75,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3667_lg__05420.1558127632.500.750.jpg?v=1785188650","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3667-marine-thermostat-kit-160f-replaces-mercruiser-thermostat-99155a1-gasket-27-89656-1-fits-mercruiser-stern-drive","provider":"Good Vibes Marina","version":"1.0","type":"link"}