{"product_id":"sierra-18-3672-thermostat-kit-for-johnson-evinrude-5-9-5-hp-outboards-1959-1986-130f-cooling-system-kit","title":"Sierra Thermostat Kit 18-3672, 130F, Johnson\/Evinrude 200 HP (1977-83) and 235 HP (1978-85) Outboards","description":"\u003cp\u003eThe Sierra Thermostat Kit 18-3672 is a replacement thermostat kit built for Johnson\/Evinrude (OMC) outboard engines, engineered to regulate engine operating temperature so the powerhead runs within its designed heat range. The kit is rated for 130F, matching the thermostat opening temperature specified by the original engine design, which helps the cooling system maintain consistent water flow and prevent overheating or over-cooling during operation.\u003c\/p\u003e\u003cp\u003eSierra manufactures this thermostat kit to meet or exceed the specifications of the original equipment part it replaces, and Sierra supplies OEM engine manufacturers and boat builders with marine parts as part of its regular production. This kit fits Johnson\/Evinrude outboards at 200 HP (1977-83) and 235 HP (1978-85), making it a straightforward drop-in replacement for boat owners servicing the cooling system on these engines.\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 18-3672\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 130F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999753687\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Type:\u003c\/strong\u003e Johnson\/Evinrude (OMC) Outboard\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eJohnson\/Evinrude (OMC) 200 HP, 1977-83\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude (OMC) 235 HP, 1978-85\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature is the Sierra 18-3672 thermostat rated for?\u003c\/strong\u003e The Sierra 18-3672 Thermostat Kit is rated for 130F, which sets the point at which the thermostat opens to allow coolant flow through the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines does the 18-3672 thermostat kit fit?\u003c\/strong\u003e This kit fits Johnson\/Evinrude (OMC) outboards at 200 HP for the 1977-83 model years and 235 HP for the 1978-85 model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3672 thermostat made of metal or glass?\u003c\/strong\u003e The thermostat in kit 18-3672 is made of glass, per its listed material construction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3672 Thermostat Kit weigh?\u003c\/strong\u003e The Sierra 18-3672 Thermostat Kit weighs 0.08 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra part 18-3672 meet OEM specifications?\u003c\/strong\u003e Yes, Sierra engineers the 18-3672 Thermostat Kit to meet or exceed the specifications of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-3672 kit?\u003c\/strong\u003e The 18-3672 kit includes the thermostat components needed for a thermostat replacement on compatible Johnson\/Evinrude outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3672 Thermostat Kit?\u003c\/strong\u003e The UPC for the Sierra 18-3672 Thermostat Kit is 030999753687.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3672 thermostat work on any outboard brand?\u003c\/strong\u003e The 18-3672 Thermostat Kit is built for Johnson\/Evinrude (OMC) outboards at 200 HP (1977-83) and 235 HP (1978-85), so fitment is specific to these applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does an outboard thermostat need replacing?\u003c\/strong\u003e A thermostat like the Sierra 18-3672 can stick open or closed over time, causing an outboard to run too cool or overheat, so replacing it with a correctly rated 130F unit restores proper cooling system regulation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-3672 a single thermostat or a full kit?\u003c\/strong\u003e Sierra 18-3672 is sold as a Thermostat Kit rather than a bare thermostat alone.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988157411547,"sku":"SIE-18-3672","price":24.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__30196.1753840679.500.750.jpg?v=1785188459","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3672-thermostat-kit-for-johnson-evinrude-5-9-5-hp-outboards-1959-1986-130f-cooling-system-kit","provider":"Good Vibes Marina","version":"1.0","type":"link"}