{"product_id":"marine-thermostat-kit-for-evinrude-outboards-replaces-oem-396987-sierra-18-3669-thermostat-cover-gasket","title":"Sierra Thermostat Kit 18-3669 - Replaces OMC 396987 - Evinrude V-6 Crossflow Outboards","description":"\u003cp\u003eThe Sierra Thermostat Kit 18-3669 is built for Evinrude V-6 Crossflow outboard engines and provides the components needed to restore proper cooling system temperature regulation. The kit is designed to work with thermostat 18-3543 and includes the thermostat components required for a complete, reliable repair rather than a single replacement part on its own.\u003c\/p\u003e\u003cp\u003eInside the kit, the thermostat identified as 18-3557 corresponds to O.E. Number 396987, giving buyers a direct cross-reference to the original equipment part it replaces. A second thermostat component, 18-2548, is also included as part of the kit contents, rounding out what is needed for the job. Because the parts are packaged together as a kit, installers do not need to source individual thermostats separately when servicing the cooling system on a compatible V-6 Crossflow outboard.\u003c\/p\u003e\u003cp\u003eAt 0.17 pounds, the kit is compact and easy to handle, making it a straightforward addition to routine outboard maintenance or a cooling system troubleshooting repair. This kit is intended specifically for Evinrude V-6 Crossflow applications, so confirming your engine matches this configuration before ordering is recommended.\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 18-3669\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Thermostat Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.17 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563071\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Thermostat:\u003c\/strong\u003e Uses thermostat 18-3543\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Thermostat 18-3557 (O.E. 396987), Thermostat 18-2548\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude V-6 Crossflow outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e396987\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is the Sierra 18-3669 thermostat kit designed for?\u003c\/strong\u003e This kit is designed for Evinrude V-6 Crossflow outboard engines and is built to work with thermostat 18-3543.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3669 kit replace an OEM part number?\u003c\/strong\u003e Yes, the thermostat included in this kit (Sierra 18-3557) corresponds to O.E. Number 396987, making 18-3669 a direct replacement option for that original equipment thermostat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the Sierra 18-3669 thermostat kit?\u003c\/strong\u003e The kit contains two thermostat components: 18-3557, which corresponds to O.E. Number 396987, and 18-2548.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3669 thermostat kit weigh?\u003c\/strong\u003e The kit weighs 0.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3669 kit compatible with thermostat 18-3543?\u003c\/strong\u003e Yes, this kit is specified to be used with thermostat 18-3543 on compatible V-6 Crossflow outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this an aftermarket or genuine part?\u003c\/strong\u003e The 18-3669 kit is a Sierra-branded thermostat kit manufactured as a replacement part; it is not sold as a genuine OEM Evinrude part, though its included thermostat corresponds to OEM number 396987.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3669 thermostat kit?\u003c\/strong\u003e The UPC for the Sierra Thermostat Kit 18-3669 is 030999563071.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use this kit on any V-6 outboard engine?\u003c\/strong\u003e No, the 18-3669 kit is specified for Evinrude V-6 Crossflow outboard engines rather than V-6 outboards in general.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the kit include both thermostats needed for the engine?\u003c\/strong\u003e The 18-3669 kit includes two thermostat components, 18-3557 and 18-2548, packaged together for the applicable V-6 Crossflow outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is the Sierra 18-3669?\u003c\/strong\u003e Sierra 18-3669 is a thermostat kit, part of the thermostats and gaskets category for outboard cooling system maintenance.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988157214939,"sku":"SIE-18-3669","price":31.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3669_lg__71397.1558124834.500.750.jpg?v=1785329186","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-thermostat-kit-for-evinrude-outboards-replaces-oem-396987-sierra-18-3669-thermostat-cover-gasket","provider":"Good Vibes Marina","version":"1.0","type":"link"}