{"product_id":"sierra-18-3649-marine-engine-thermostat-160f-replaces-crusader-97895-mercruiser-8m0091470-fresh-water-cooling","title":"Sierra 18-3649 160 Degree Thermostat, Replaces Mercury Marine 807252-2, Fits Mercruiser 4.3L\/4.3LX (262 CID)","description":"\u003cp\u003eThe Sierra 18-3649 is a 160 degree F thermostat built for Mercruiser 205\/4.3L and 4.3 LX (262 CID) sterndrive engines with serial number F001220 and up. It is designed for engines using a single and 3-point drain cooling system, and it regulates coolant flow so the engine reaches and holds its correct operating temperature. The thermostat is a direct replacement for the original equipment unit on this engine and serial range, restoring proper warm-up and temperature control when the factory thermostat has failed, is stuck open or closed, or is simply due for routine replacement.\u003c\/p\u003e\u003cp\u003eThis thermostat cross-references to OEM and aftermarket numbers used across several marine engine brands, including Crusader, GLM, Mallory, and Mercury Marine\/Mercruiser part numbers, making it a straightforward swap for boat owners and marine technicians replacing a worn or failed thermostat. Confirm your engine's serial number falls within the F001220 and up range before ordering, since Sierra lists a different thermostat (18-3668) for earlier engines in the same 205\/4.3L, 4.3 LX (262 CID) model line.\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 18-3649\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 160 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 5 inches D x 4 inches W x 1 inch H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.13 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282258832\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercruiser 205\/4.3L, 4.3 LX (262 CID) engines, serial number F001220 and up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrain System:\u003c\/strong\u003e Single and 3-point drain system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Crusader 97895, GLM 13100, Mallory 9-43002, Mercury Marine 807252-2, Mercruiser 8M0091470, 807252T2, 8072522, 8052732, 8M0109441\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser 205\/4.3L, 4.3 LX (262 CID) engines, serial number F001220 and up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCrusader 97895\u003c\/li\u003e\n\u003cli\u003eGLM 13100\u003c\/li\u003e\n\u003cli\u003eMallory 9-43002\u003c\/li\u003e\n\u003cli\u003eMercury Marine 807252-2\u003c\/li\u003e\n\u003cli\u003eMercruiser 8M0091470\u003c\/li\u003e\n\u003cli\u003eMercruiser 807252T2\u003c\/li\u003e\n\u003cli\u003eMercruiser 8072522\u003c\/li\u003e\n\u003cli\u003eMercruiser 8052732\u003c\/li\u003e\n\u003cli\u003eMercruiser 8M0109441\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature does the Sierra 18-3649 thermostat open at?\u003c\/strong\u003e The Sierra 18-3649 is rated at 160 degrees F, which is the temperature at which it begins to open and allow coolant to circulate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines does the Sierra 18-3649 fit?\u003c\/strong\u003e This thermostat fits Mercruiser 205\/4.3L and 4.3 LX (262 CID) engines with serial number F001220 and up, and is intended for engines using a single and 3-point drain cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3649 fit earlier 4.3L Mercruiser engines below serial number F001220?\u003c\/strong\u003e No. Earlier 205\/4.3L, 4.3 LX (262 CID) engines below serial number F001220 use a different Sierra thermostat, 18-3668, so check your engine's serial number before ordering 18-3649.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-3649 replace?\u003c\/strong\u003e It cross-references to Crusader 97895, GLM 13100, Mallory 9-43002, Mercury Marine 807252-2, and Mercruiser 8M0091470, 807252T2, 8072522, 8052732, and 8M0109441.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3649 thermostat weigh?\u003c\/strong\u003e The Sierra 18-3649 thermostat weighs 0.13 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-3649?\u003c\/strong\u003e It measures 5 inches deep by 4 inches wide by 1 inch high.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3649 a genuine OEM part or aftermarket?\u003c\/strong\u003e The 18-3649 is a Sierra-branded replacement thermostat manufactured to meet or exceed the specifications of the original equipment part it replaces, rather than a Mercury Marine or Crusader branded OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the box with the Sierra 18-3649?\u003c\/strong\u003e The Sierra 18-3649 ships as a single thermostat unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-3649 be used on a closed cooling system?\u003c\/strong\u003e The 18-3649 is listed for engines with a single and 3-point drain cooling system; confirm your engine's cooling configuration and serial number match before installing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3649 thermostat?\u003c\/strong\u003e The Sierra 18-3649 thermostat carries UPC 808282258832.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy are there multiple cross-reference numbers listed for the Sierra 18-3649?\u003c\/strong\u003e Different engine and boat manufacturers, including Crusader, GLM, Mallory, and Mercury Marine, sold their own branded versions of the same thermostat, so the 18-3649 cross-references to each of their part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the Sierra 18-3649 instead of a similar Sierra thermostat?\u003c\/strong\u003e Match your engine model (205\/4.3L or 4.3 LX, 262 CID) and serial number to the F001220-and-up range specified for the 18-3649; engines outside that range require a different Sierra part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988156788955,"sku":"SIE-18-3649","price":22.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3649__38876.1737888739.500.750.jpg?v=1785188148","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3649-marine-engine-thermostat-160f-replaces-crusader-97895-mercruiser-8m0091470-fresh-water-cooling","provider":"Good Vibes Marina","version":"1.0","type":"link"}