{"product_id":"sierra-18-3651-marine-thermostat-kit-for-mercruiser-stern-drive-142f-replaces-oem-27-90556-27-47510-27-60208","title":"Sierra Thermostat Kit 18-3651, 142 Degree, for GM 327\/350 V-8 and Ford Stern Drive Engines","description":"\u003cp\u003eThe Sierra 18-3651 Thermostat Kit is a marine engine cooling thermostat built to regulate coolant flow and keep stern drive engines operating at a stable temperature. It carries a 142 degree Fahrenheit opening rating, matching the factory-specified temperature for a range of GM and Ford based stern drive powerheads. Marine thermostats like this one are a wear item that should be checked and replaced as part of routine cooling system maintenance, since a stuck-open or stuck-closed thermostat can cause overheating or poor engine warm-up.\u003c\/p\u003e\u003cp\u003eSierra manufactures this kit to meet or exceed the performance of the original equipment part it replaces, and it is built for the demands of continuous marine duty in a harsh operating environment. The 18-3651 is used across a number of GM 327 and 350 cubic inch V-8 applications as well as Ford-based stern drive engines, so confirming your engine model and part number before ordering is important to ensure proper fit.\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 18-3651\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 142 degrees Fahrenheit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.19 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999316158\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999316158\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e GM 327 and 350 cubic inch V-8, Ford, and MCM\/MIE stern drive engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM 225 hp, 327 cubic inch V-8, 1967-1969\u003c\/li\u003e\n\u003cli\u003eMCM\/MIE 250 hp, 327 cubic inch V-8, 1968-1969\u003c\/li\u003e\n\u003cli\u003e250 hp, 350 cubic inch V-8, 1977\u003c\/li\u003e\n\u003cli\u003eFord 225\/225S stern drive engines\u003c\/li\u003e\n\u003cli\u003eFord 255 hp stern drive engines\u003c\/li\u003e\n\u003cli\u003e260 hp, 350 cubic inch V-8, 1978-1982\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 13380\u003c\/li\u003e\n\u003cli\u003eMallory 9-43152\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature does the Sierra 18-3651 thermostat open at?\u003c\/strong\u003e The Sierra 18-3651 thermostat kit is rated to open at 142 degrees Fahrenheit, which matches the factory temperature specification for the GM and Ford stern drive engines it fits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3651 fit a GM 350 V-8 stern drive engine?\u003c\/strong\u003e Yes, the Sierra 18-3651 is used on GM 350 cubic inch V-8 stern drive applications, including 250 hp and 260 hp configurations, in addition to GM 327 cubic inch V-8 engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3651 work on a Ford-powered stern drive?\u003c\/strong\u003e Yes, this thermostat kit also fits Ford-based stern drive engines, including 225\/225S and 255 hp applications, so it covers both GM and Ford powerheads depending on the engine's part number requirements.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the 18-3651 kit include?\u003c\/strong\u003e The Sierra 18-3651 is sold as a thermostat kit, meaning it includes the 142 degree thermostat itself as the core component for the cooling system service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3651 an OEM part or aftermarket?\u003c\/strong\u003e The 18-3651 is a Sierra-manufactured aftermarket thermostat kit engineered to meet or exceed the performance of the original equipment thermostat it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM or other aftermarket thermostats does the 18-3651 replace?\u003c\/strong\u003e This Sierra thermostat kit interchanges with GLM 13380 and Mallory 9-43152, so any of those part numbers point to the same 142 degree thermostat application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3651 thermostat kit weigh?\u003c\/strong\u003e The 18-3651 thermostat kit weighs 0.19 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need to replace my stern drive thermostat?\u003c\/strong\u003e A marine thermostat like the Sierra 18-3651 should be replaced if the engine is overheating, running too cool, or has an inconsistent operating temperature, since a stuck thermostat is a common cause of these symptoms.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-3651 on a 1968 GM 327 V-8 stern drive engine?\u003c\/strong\u003e Yes, the Sierra 18-3651 is listed for GM 250 hp, 327 cubic inch V-8 applications built in 1968-1969, among other GM and Ford engine years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3651 brand new or remanufactured?\u003c\/strong\u003e The Sierra 18-3651 is a new thermostat kit, not a remanufactured or used part.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988156854491,"sku":"SIE-18-3651","price":22.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3651_lg__62228.1558126673.500.750.jpg?v=1785189112","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3651-marine-thermostat-kit-for-mercruiser-stern-drive-142f-replaces-oem-27-90556-27-47510-27-60208","provider":"Good Vibes Marina","version":"1.0","type":"link"}