{"product_id":"marine-thermostat-kit-for-mercruiser-496-mag-ho-8-1l-mie-ho-replaces-mercury-8m0074922-863358t-160-degree-sierra-18-3652","title":"Sierra 18-3652 Thermostat Kit for Mercruiser 496 Mag \u0026 HO, 8.1L MIE \u0026 HO, Replaces Mercury 863358T","description":"\u003cp\u003eThe Sierra 18-3652 Thermostat Kit is a complete engine cooling system repair kit built for Mercruiser 496 Mag \u0026amp; HO and 8.1L MIE \u0026amp; HO stern drive engines. Replacing a worn or stuck thermostat is one of the most common maintenance tasks on these engines, and this kit supplies everything needed to do the job in one purchase rather than sourcing the thermostat and gaskets separately. The kit is built around a 160 degree Fahrenheit thermostat (Sierra part 18-3552, O.E. #76270), which regulates engine coolant flow to keep the engine within its proper operating temperature range. Running too cool or too hot can reduce engine efficiency and accelerate wear, so a properly functioning thermostat is essential to reliable operation.\u003c\/p\u003e\u003cp\u003eAlong with the thermostat, the kit includes two thermostat cover gaskets: Sierra part 18-2555 (O.E. #27-89656-1) and Sierra part 18-2843 (O.E. #27-74830), ensuring a proper seal at the thermostat housing and eliminating the need to source gaskets separately or reuse old, hardened ones. Sierra engineers its cooling system components to meet or exceed the original equipment parts they replace, and the 18-3652 kit is manufactured to fit directly in place of the original Mercury thermostat assembly on the specified engines, with no modification required.\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 18-3652\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 160 degrees Fahrenheit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.16 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Thermostat (18-3552), Thermostat Cover Gasket (18-2555), Thermostat Cover Gasket (18-2843)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury 863358T, 8M0074922, 8M0076464\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999316165\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser 496 Mag \u0026amp; HO\u003c\/li\u003e\n\u003cli\u003eMercruiser 8.1L MIE \u0026amp; HO\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury 863358T\u003c\/li\u003e\n\u003cli\u003eMercury 8M0074922\u003c\/li\u003e\n\u003cli\u003eMercury 8M0076464\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3652 thermostat kit include?\u003c\/strong\u003e The kit includes a 160 degree Fahrenheit thermostat (Sierra 18-3552) plus two thermostat cover gaskets (Sierra 18-2555 and Sierra 18-2843), giving you everything needed to replace the thermostat and reseal the housing in one purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3652 thermostat kit fit?\u003c\/strong\u003e This kit is designed for Mercruiser 496 Mag \u0026amp; HO and 8.1L MIE \u0026amp; HO stern drive engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature rating is the thermostat in kit 18-3652?\u003c\/strong\u003e The thermostat included in the Sierra 18-3652 kit is rated to open at 160 degrees Fahrenheit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3652 kit replace Mercury OEM parts?\u003c\/strong\u003e Yes, Sierra 18-3652 cross-references to Mercury part numbers 863358T, 8M0074922, and 8M0076464.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3652 thermostat kit weigh?\u003c\/strong\u003e The Sierra 18-3652 thermostat kit weighs 0.16 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to buy gaskets separately for a thermostat replacement?\u003c\/strong\u003e No, the Sierra 18-3652 kit already includes both required thermostat cover gaskets (18-2555 and 18-2843), so no separate gasket purchase is needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3652 thermostat kit made to OEM standards?\u003c\/strong\u003e Sierra manufactures its cooling system parts, including the 18-3652 kit, to meet or exceed the specifications of the original equipment parts they replace.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse the old thermostat cover gasket instead of the ones in the kit?\u003c\/strong\u003e It is not recommended; the Sierra 18-3652 kit supplies fresh gaskets (18-2555 and 18-2843) specifically because reused gaskets can leak once they have been compressed and heat-cycled.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the individual thermostat part number inside kit 18-3652?\u003c\/strong\u003e The thermostat itself is Sierra part 18-3552, corresponding to O.E. Number 76270.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-3652 kit fit any Mercruiser engine?\u003c\/strong\u003e No, fitment is specific to the Mercruiser 496 Mag \u0026amp; HO and 8.1L MIE \u0026amp; HO engines, so buyers should confirm their engine model matches before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the thermostat in the 18-3652 kit?\u003c\/strong\u003e The thermostat included with Sierra 18-3652 is white.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988156985563,"sku":"SIE-18-3652","price":27.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3652_lg__93203.1558126738.500.750.jpg?v=1785188170","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-thermostat-kit-for-mercruiser-496-mag-ho-8-1l-mie-ho-replaces-mercury-8m0074922-863358t-160-degree-sierra-18-3652","provider":"Good Vibes Marina","version":"1.0","type":"link"}