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Quicksilver 8M0174561 Thermostat Housing 140°F Mercury Verado 135-400HP

Manufacturer

Quicksilver

<h3>About Quicksilver</h3><p><strong>Quicksilver</strong> has been a cornerstone of the marine industry since 1950, delivering the parts, accessories, and engine care products that keep boats running at their best. A division of Brunswick Corporation and closely aligned with Mercury Marine, Quicksilver has grown into one of the most trusted names on the water — offering more than 40,000 parts across a broad range of product lines designed for both the weekend boater and the seasoned marine professional.</p><p>What sets Quicksilver apart is its unique position as the premier supplier of Mercury Marine Original Equipment replacement parts, while simultaneously serving owners of nearly every major marine engine brand. Whether your vessel is powered by Mercury, Mariner, Honda, Yamaha, Evinrude/Johnson, or Suzuki, Quicksilver produces components engineered to fit and perform like the originals. This cross-brand compatibility, combined with factory-level quality standards, is why boaters worldwide have made Quicksilver their go-to source for maintenance and repair.</p><p>The Quicksilver catalog spans the full spectrum of marine maintenance needs. At its core are <a href="/7456-quicksilver-fuel-pump-6244">fuel pumps</a> and complete fuel pump and carburetor kit solutions that keep fuel delivery systems operating reliably under demanding on-water conditions. For those needing a broader fuel system overhaul, Quicksilver&apos;s lineup of <a href="/7456-quicksilver-fuel-pumps-201310">fuel pumps</a> covers outboard and sterndrive applications alike. Above the waterline, few components are as performance-critical as the prop, and Quicksilver&apos;s extensive range of <a href="/200673-propellers-quicksilver-7456">propellers</a> — from aluminum to stainless steel — gives boaters the ability to tune their vessel&apos;s performance to their exact needs. Rounding out the drivetrain, Quicksilver also offers precision-engineered <a href="/7456-quicksilver-drives-gearcases-transoms-200346">drives, gearcases, and transom components</a> that are essential for maintaining the mechanical heart of sterndrive and inboard systems.</p><p>Quicksilver products undergo rigorous testing and engineering validation — the result of decades of R&amp;D conducted alongside Mercury Marine&apos;s own engineering teams. The brand&apos;s commitment to quality means that each part meets or exceeds OEM specifications, giving do-it-yourself boaters and marine technicians alike the confidence that a Quicksilver repair will hold up season after season. From freshwater lakes to demanding saltwater environments, Quicksilver is built for wherever your adventures take you.</p>

Part Number

8M0174561
09/15/2036 6:25 AM
Sale Price

$177.99

In Stock (10+)

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Product Details

The Quicksilver 8M0174561 is an OEM replacement thermostat housing with integrated 140°F thermostat, designed for select Mercury 4-stroke Verado outboard engines ranging from 135 to 400 horsepower. As a genuine Quicksilver part, it restores precise engine temperature regulation and ensures your outboard's cooling system operates at factory specifications.

The housing is constructed from a corrosion-resistant, high-temperature molded composite material engineered for extended service life in harsh marine environments. A 90-degree bend on the outflow side and a built-in stainless steel thermostat are integrated directly into the housing assembly, simplifying the replacement process and maintaining reliable coolant flow management.

This kit replaces previous OEM part number 892864T04 and is compatible with the following Mercury Verado engine configurations:

  • 135–200HP (4-cylinder) — Serial No. 1B311420 and above
  • 200–300HP (6-cylinder, prior to Gen V) — Serial No. 1B390143 to 2B144127
  • 200–300HP (6-cylinder, Gen V) — Serial No. 2B144123 and above
  • 350–400HP (6-cylinder) — All serial numbers

What's Included:

  • Thermostat housing
  • Internal stainless steel thermostat

Note: Seals, gaskets, clamps, and attaching hardware are sold separately. Always replace all housing seals, gaskets, and clamps when servicing to ensure proper cooling system function. Consult your engine's service manual for complete installation guidance.

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