{"product_id":"mercury-w-thermostat-hsg-verado-8m0174561","title":"Mercury – Quicksilver 8M0174561 Thermostat Housing 140°F | Verado Cooling System | Composite \u0026 Stainless Steel | 8M0174561","description":"\u003ch2\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Quicksilver 8M0174561 Thermostat Housing 140°F | Verado Cooling System | Composite \u0026amp; Stainless Steel | 8M0174561\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIf you’ve spent any real time on the water, you already know that an engine that runs \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecool\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e and steady is an engine you can trust. There’s a calm that settles in when your temperatures stay right where they should — not climbing during long runs, not dipping when you idle into a quiet harbor. This 140-degree Mercury thermostat housing is one of those behind-the-scenes parts that \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ekeeps\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e everything balanced. You may not think about it often, but when it’s doing its job, every minute on the water feels smoother, more predictable, and a whole lot more enjoyable.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eReplacement \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e140°F thermostat housing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for select Mercury 135–400 horsepower Verado 4-stroke outboards\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBuilt from corrosion-resistant, high-temperature composite material\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eIntegrated \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eStainless Steel thermostat\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for stable and accurate cooling control\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eMolded housing includes a \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e90-degree outflow bend\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for proper routing\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThermostat and housing included; seals, gaskets, clamps, and hardware sold separately\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesigned for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eMercury 135hp, 150hp, 175hp, 200hp, 250hp, 300hp, 350hp, and 400hp \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e4-stroke Verado outboards\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCommon on offshore center consoles, bay boats, large pontoons, coastal cruisers, sport-fishing rigs, and high-power family boats\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for engines operating in demanding hot-weather or high-load environments\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA thermostat housing may not be glamorous, but anyone who’s had temperature issues knows how \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eimportant\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e this component is. The 8M0174561 keeps coolant flowing at \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eexactly\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e the right pace, letting your Verado settle into that comfortable 140-degree sweet spot. When everything is aligned — the thermostat opening smoothly, the housing holding firm, and the flow path unobstructed — the engine feels tight, responsive, and steady.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eYou\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e’ll notice how cleanly the engine holds temperature on long offshore runs, even when you’re pushing hard through heavy chop. At idle, the cooling system stays consistent, preventing heat fluctuations that can rob performance over time. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e composite housing resists the corrosion that saltwater environments \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ethrow at it\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, while the internal Stainless Steel thermostat \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003estays\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e reliable season after season.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe installation itself is refreshingly straightforward. With basic tools and good access around the powerhead, most boat owners can handle it in their own driveway. Swap the old housing, replace the seals and clamps, tighten everything down, and you’re ready to go. The payoff is immediate — a cooling system that feels smoother and more balanced every time you hit the start button.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCooling components aren’t where you want to gamble on aftermarket shortcuts. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury designed this thermostat housing specifically for high-output Verado engines, \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ewhich means\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e the flow rate, temperature tolerance, and material stiffness are \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eall\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e exactly where they need to be.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Aftermarket versions often \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003emiss the mark\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e on internal tolerances or long-term heat resistance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBy c\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ehoosing a genuine Mercury Marine part, you get perfect fitment, reliable operation, and long-term confidence. It’s one of those small investments that pays you back every time your engine runs \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecool\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, quiet, and right on temperature.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which Mercury engines does this thermostat housing fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It fits select Mercury Verado 135–400 horsepower 4-stroke outboards.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2:\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e What makes this different from aftermarket housings?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOEM materials \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ehandle\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e heat and corrosion better, and the internal Stainless Steel thermostat is \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecalibrated\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e precisely for Verado cooling systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know it’s the correct replacement?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Match your engine model and horsepower range to the compatibility list, and confirm through your serial number.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can this be used in both saltwater and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Absolutely — the composite body and Stainless Steel thermostat are built for harsh marine environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation straightforward?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes. With basic tools and proper seals and clamps, most boat owners can install it without difficulty.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626540228899,"sku":"8M0174561","price":177.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8M0174561_Main-1.jpg?v=1760631467","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-w-thermostat-hsg-verado-8m0174561","provider":"PartsVu","version":"1.0","type":"link"}