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Quicksilver 8M0162139 Replacement Thermostat 140°F Marine Outboard

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

8M0162139
09/15/2036 10:47 PM
Sale Price

$115.99

In Stock (10+)

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Product Details

The Quicksilver 8M0162139 is a precision-engineered 140°F replacement thermostat designed specifically for select Mercury 175-300hp and 450R outboard engines with 3.4L V6 and 4.6L V8 4-stroke powerheads (serial number 2B529482 and above). This genuine OEM component ensures your outboard maintains optimal operating temperature for peak performance and fuel efficiency.

Key Features:

  • Corrosion-resistant stainless steel construction for extended service life in harsh marine environments
  • Self-cleaning design allows contaminants to flush through closing surfaces, preventing buildup
  • Precisely calibrated to 140°F for proper cooling system temperature response
  • Direct OEM replacement for easy installation with common tools
  • Engineered to deliver peak engine performance and maximum efficiency

Application: Compatible with Mercury 175-300hp and 450R outboards featuring 3.4L V6 and 4.6L V8 4-stroke engines (serial number 2B529482 and above). Thermostat only—additional seals or gaskets may be required for installation. Consult your owner's manual or service manual for complete installation instructions and parts requirements.

Regular thermostat maintenance is critical for preventing overheating and ensuring your Mercury outboard runs at its designed temperature range for optimal combustion and longevity.

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