{"product_id":"ghmarine-mercruiser-thermostat-repair-kit-4-3-8-2l-160-f-thermostat-gaskets-sleeve","title":"GHmarine Mercruiser Thermostat Repair Kit 4.3-8.2L — 160°F Thermostat, Gaskets \u0026 Sleeve","description":"\u003cp\u003e\u003cstrong\u003eThe GHmarine 18-3647 Thermostat Repair Service Kit is a complete replacement set designed to restore proper engine cooling in Mercruiser 4.3–8.2L sterndrive models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your Mercruiser-powered boat is running hotter than normal or you’re rebuilding the cooling assembly, this repair kit supplies the thermostat and all the small parts needed to get the temperature control system back to specification. The kit matches OEM cross-references and fits a wide range of Mercruiser sterndrive engines, offering a 160°F temperature-rated thermostat, sealing components and a housing sleeve so you can replace worn pieces without sourcing multiple parts separately.\u003c\/p\u003e\n\n\u003ch3\u003eWhat components are included and why do they matter?\u003c\/h3\u003e\n\u003cp\u003eThe kit bundles each part required to complete a standard thermostat replacement so you avoid leaks and misalignment after reassembly. Having the matching gaskets and sleeve improves sealing and ensures the thermostat seats properly for consistent cooling performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne 160°F thermostat calibrated for Mercruiser engine cooling ranges\u003c\/li\u003e\n  \u003cli\u003eOne O-ring to prevent coolant seepage at the housing joint\u003c\/li\u003e\n  \u003cli\u003eOne housing sleeve to replace a corroded or deformed mating surface\u003c\/li\u003e\n  \u003cli\u003eFour thermostat gaskets for reliable sealing and easy installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this kit fit my Mercruiser model and replace OEM parts?\u003c\/h3\u003e\n\u003cp\u003eThis repair kit is engineered to be compatible with many Mercruiser sterndrive engines between 4.3L and 8.2L, and it cross-references several OEM numbers so technicians can swap parts with confidence. Check your engine parts list or the OEM numbers to confirm a match before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Mercruiser 4.3–8.2L sterndrive models\u003c\/li\u003e\n  \u003cli\u003eReplaces OEM part numbers such as 807252Q5, 807252T8, 8052732 and others\u003c\/li\u003e\n  \u003cli\u003eAlso cross-references GLM 13101, Mallory 9-43157, Sierra 18-3647\u003c\/li\u003e\n  \u003cli\u003eDesigned as a direct service kit for common Mercruiser thermostat assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I use this kit during a repair or service?\u003c\/h3\u003e\n\u003cp\u003eUse the kit during a thermostat replacement, cooling system maintenance or when the housing shows corrosion. Remove the old thermostat and seals, inspect the housing bore, fit the new sleeve and gaskets, then install the thermostat to the specified orientation and torque for a leak-free assembly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDrain coolant and remove thermostat housing per factory procedure\u003c\/li\u003e\n  \u003cli\u003eReplace old thermostat with the 160°F unit included in kit\u003c\/li\u003e\n  \u003cli\u003eInstall O-ring, sleeve and new gaskets to ensure proper sealing\u003c\/li\u003e\n  \u003cli\u003eRefill coolant and pressure-test the system before returning to service\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance and safety considerations should I keep in mind?\u003c\/h3\u003e\n\u003cp\u003eThe thermostat’s 160°F rating is intended to maintain engine temperatures within the typical operating band for the covered Mercruiser engines. Always use recommended coolant and follow torque specs to prevent leaks; if the housing or surrounding components are heavily corroded, inspect and replace those parts to avoid premature failure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThermostat opens and closes around the specified 160°F temperature\u003c\/li\u003e\n  \u003cli\u003eUse compatible coolant and follow OEM maintenance intervals\u003c\/li\u003e\n  \u003cli\u003eReplace damaged housing or hoses to ensure long-term reliability\u003c\/li\u003e\n  \u003cli\u003eVerify seals and torque values during reassembly to prevent leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this kit for: The GHmarine 18-3647 Thermostat Repair Service Kit is aimed at marine technicians, boat owners who do their own maintenance, and service shops working on Mercruiser sterndrive engines from 4.3L up to 8.2L. It’s useful for routine thermostat swaps, cooling-system overhauls, or when you need OEM-compatible replacements without sourcing multiple individual parts.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this kit fit Mercruiser 5.7L engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the GHmarine 18-3647 kit fits Mercruiser sterndrive engines from 4.3L through 8.2L, including 5.7L models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What temperature does the thermostat open at?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The thermostat in this kit is rated to operate at approximately 160°F (71°C) for typical engine cooling ranges.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GHmarine","offers":[{"title":"Default Title","offer_id":48085638643870,"sku":"B0D1N2LXDM","price":46.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ghmarine-18-3647-front-packaging.jpg?v=1785875931","url":"https:\/\/northtrailauto.ca\/products\/ghmarine-mercruiser-thermostat-repair-kit-4-3-8-2l-160-f-thermostat-gaskets-sleeve","provider":"North Trail Auto","version":"1.0","type":"link"}