{"product_id":"new-991551-863358t-27-896561-thermostat-for-mercruiser-sterndrive-4-3l-5-7l-7-4l","title":"NEW 991551 863358T 27-896561 THERMOSTAT FOR MERCRUISER STERNDRIVE 4.3L 5.7L 7.4L","description":"\u003ch2\u003eThermostat for MerCruiser\u003c\/h2\u003e\u003cp\u003eThis thermostat for MerCruiser sterndrive engines replaces OEM part numbers 991551, 863358T, and 27-896561 to regulate engine temperature.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis thermostat for MerCruiser sterndrive engines ensures optimal operating temperature. The thermostat opens and closes to maintain proper cooling flow, preventing overheating or overcooling. For MerCruiser 4.3L, 5.7L, and 7.4L engines, this thermostat is a direct replacement part.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-calibrated opening temperature for consistent operation\u003c\/li\u003e\n\u003cli\u003eRugged construction for saltwater and freshwater use\u003c\/li\u003e\n\u003cli\u003eCompatible with multiple MerCruiser engine displacements\u003c\/li\u003e\n\u003cli\u003eOEM-spec replacement for part numbers 991551, 863358T, 27-896561\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor MerCruiser 4.3L\u003c\/li\u003e\n\u003cli\u003efor MerCruiser 5.7L\u003c\/li\u003e\n\u003cli\u003efor MerCruiser 7.4L\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eReplaces worn thermostats during cooling system service\u003c\/li\u003e\n\u003cli\u003eEnsures even engine warm-up in marine applications\u003c\/li\u003e\n\u003cli\u003eHelps maintain fuel efficiency and performance\u003c\/li\u003e\n\u003cli\u003eUsed in both saltwater and freshwater boating\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e991551, 863358T, 27-896561\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What is the typical opening temperature? \u003cstrong\u003eA:\u003c\/strong\u003e Usually around 160°F, but check your engine's specification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can this thermostat be used with raw water cooling? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, it is designed for marine cooling systems.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":45556602765398,"sku":"ZZ3E01074","price":34.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_dacca4b5-f525-42c8-86d8-8c439d22eb5d.jpg?v=1789215676","url":"https:\/\/www.solidspare.com\/products\/new-991551-863358t-27-896561-thermostat-for-mercruiser-sterndrive-4-3l-5-7l-7-4l","provider":"Solid Spare","version":"1.0","type":"link"}