{"product_id":"sierra-18-3618-thermostat-kit-150f-raw-water-cooled-volvo-penta-i-o-cooling-system","title":"Sierra 18-3618 Raw Water Cooled Thermostat Kit, 150 Degree, Volvo Penta I\/O Cooling System","description":"\u003cp\u003eThe Sierra 18-3618 is a raw water cooled thermostat kit built for Volvo Penta I\/O engines that use a raw (open) cooling system, where river, lake, or sea water runs directly through the cylinder block. This kit uses a 150 degree Fahrenheit thermostat, which regulates the engine's operating temperature by controlling the flow of raw water through the cooling passages once the engine reaches that threshold. Maintaining the correct opening temperature protects against overheating in warm operating conditions while still allowing the engine to reach efficient running temperature quickly after startup.\u003c\/p\u003e\u003cp\u003eAs a raw water cooled thermostat, the 18-3618 is designed specifically for open cooling systems rather than closed (fresh water\/antifreeze) systems, so it is important to match the thermostat type to your engine's cooling configuration. The kit carries Sierra's part number 18-3618 and is intended as a direct fit for the Volvo Penta I\/O cooling system application it is listed for.\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 18-3618\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling System Type:\u003c\/strong\u003e Raw Water Cooled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat Opening Temperature:\u003c\/strong\u003e 150 degrees Fahrenheit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e I\/O - Volvo Penta Cooling System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282270599\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eVolvo Penta I\/O engines with a raw water (open) cooling system, where raw water runs through the cylinder block\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature thermostat is in the Sierra 18-3618 kit?\u003c\/strong\u003e The Sierra 18-3618 kit uses a 150 degree Fahrenheit thermostat, which opens at that temperature to regulate raw water flow through the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3618 for a raw water or fresh water cooling system?\u003c\/strong\u003e It is a raw water cooled thermostat kit, meaning it is designed for open cooling systems where river, lake, or sea water runs directly through the cylinder block, not for closed fresh water\/antifreeze systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3618 fit?\u003c\/strong\u003e This thermostat kit is intended for Volvo Penta I\/O engines equipped with a raw water (open) cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3618 thermostat kit weigh?\u003c\/strong\u003e The 18-3618 thermostat kit weighs 0.12 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the raw water and fresh water version of this thermostat?\u003c\/strong\u003e The raw water cooled version, part number 18-3618, is built for open cooling systems where outside water circulates through the engine block; a fresh water cooled version exists as a separate part number for closed cooling systems, so it is important to confirm which cooling system your engine uses before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-3618 kit?\u003c\/strong\u003e The 18-3618 is sold as a thermostat kit under Sierra part number 18-3618.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the raw water cooling system need a thermostat at all?\u003c\/strong\u003e In a raw water (open) cooling system, the thermostat still regulates when raw water is allowed to flow through the cylinder block, helping the Volvo Penta I\/O engine reach and hold a stable operating temperature.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-3618 a genuine Sierra part or an aftermarket equivalent?\u003c\/strong\u003e The 18-3618 is a Sierra branded thermostat kit, sold under Sierra's own part number for the Volvo Penta I\/O raw water cooling application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if I install the wrong opening temperature thermostat?\u003c\/strong\u003e Using a thermostat with the wrong opening temperature can cause the engine to run cooler or hotter than intended; the 18-3618 kit is specifically rated for a 150 degree Fahrenheit opening point for Volvo Penta I\/O raw water cooled applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-3618 be used on a closed (fresh water) cooling system?\u003c\/strong\u003e No, the 18-3618 is designated as a raw water cooled thermostat kit and is intended for open cooling systems where raw water runs through the cylinder block, not closed fresh water systems.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988155085019,"sku":"SIE-18-3618","price":26.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3618__74888.1558188912.500.750.jpg?v=1785188914","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3618-thermostat-kit-150f-raw-water-cooled-volvo-penta-i-o-cooling-system","provider":"Good Vibes Marina","version":"1.0","type":"link"}