{"product_id":"marine-thermostat-143f-for-mercury-mariner-outboard-v135-v150-replaces-oem-75692-sierra-18-3553","title":"Sierra 18-3553 Brass Thermostat, 143 Degree F, Replaces Mercury 75692, Fits Mercury V135\/V150","description":"\u003cp\u003eThe Sierra 18-3553 is a brass thermostat built for Mercury marine engine applications. It is manufactured to control engine operating temperature at a 143 degree F rating, matching the original equipment part it replaces. The brass construction is chosen for corrosion resistance and reliable, consistent operation in a marine cooling system where saltwater and freshwater exposure can degrade lesser materials over time.\u003c\/p\u003e\u003cp\u003eThis thermostat directly replaces Mercury Marine part number 75692 and is engineered to meet or exceed the performance of the original equipment component it is designed to replace. It fits Mercury V135 and V150 series engines, including the V150 XR4, V150 XR6, and V150 MAGII variants, within the serial number ranges listed below. Confirming your engine's serial number against these ranges before ordering will help ensure correct fitment.\u003c\/p\u003e\u003cp\u003eSierra is a long-established supplier of marine replacement parts, and this thermostat is covered under Sierra's standard customer satisfaction warranty. It is a straightforward drop-in replacement for engine cooling system maintenance and repair.\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 18-3553\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Rating:\u003c\/strong\u003e 143 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.06 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 75692\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999236913\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercury V135, V150, V150 XR4, V150 XR6, V150 MAGII\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury V135, serial number A904646 and up\u003c\/li\u003e\n\u003cli\u003eMercury V150, serial number A904646 and up\u003c\/li\u003e\n\u003cli\u003eMercury V150 XR4, serial number C239553 to C159199\u003c\/li\u003e\n\u003cli\u003eMercury V150 XR6, serial number D082000 and up\u003c\/li\u003e\n\u003cli\u003eMercury V150 MAGII, serial numbers C239553, 4571651\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e75692\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3553 thermostat fit?\u003c\/strong\u003e The Sierra 18-3553 thermostat fits Mercury V135 and V150 series engines, including the V150 XR4, V150 XR6, and V150 MAGII, within specific engine serial number ranges, so it is best to confirm your engine's serial number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature rating is the 18-3553 thermostat?\u003c\/strong\u003e It is rated at 143 degrees F, which is the temperature at which the thermostat opens to allow coolant flow through the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-3553 replace?\u003c\/strong\u003e This thermostat replaces Mercury Marine OEM part number 75692.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-3553 thermostat made from?\u003c\/strong\u003e Brass is the material used for the Sierra 18-3553 thermostat, chosen for its corrosion resistance in marine cooling systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3553 thermostat weigh?\u003c\/strong\u003e The Sierra 18-3553 thermostat weighs 0.06 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3553 a genuine Mercury Marine part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-brand aftermarket thermostat manufactured to meet or exceed the performance of the original Mercury Marine 75692 part it replaces, not a Mercury Marine branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3553 thermostat include a gasket?\u003c\/strong\u003e No, the Sierra 18-3553 is the thermostat itself; the thermostat gasket is a separate Sierra part number and should be ordered individually if needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat serial number range applies to the V150 XR4 engine for this thermostat?\u003c\/strong\u003e For the Mercury V150 XR4, the Sierra 18-3553 thermostat applies to engine serial numbers from C239553 to C159199.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3553 thermostat?\u003c\/strong\u003e The UPC for the Sierra 18-3553 thermostat is 030999236913.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3553 thermostat covered by a warranty?\u003c\/strong\u003e Yes, the Sierra 18-3553 thermostat is covered under Sierra's standard customer satisfaction warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988152922331,"sku":"SIE-18-3553","price":20.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3553_lg__14106.1558126718.500.750.jpg?v=1785188764","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-thermostat-143f-for-mercury-mariner-outboard-v135-v150-replaces-oem-75692-sierra-18-3553","provider":"Good Vibes Marina","version":"1.0","type":"link"}