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Engineered Marine Products 75-08634 Vernatherm Thermostat

Manufacturer

Engineered Marine Products

<h3>About Engineered Marine Products (EMP)</h3><p><strong>Engineered Marine Products</strong> — known throughout the industry as EMP — has been a trusted name in marine engine service parts for over 40 years. <a href="/13199-engineered-marine-products">EMP</a> supplies OEMs, distributors, dealers, and professional rebuilders worldwide with high-quality components designed to keep outboard, sterndrive, and inboard engines running reliably on the water.</p><p>What sets EMP apart is its unwavering commitment to OEM-grade engineering. Every component in the EMP catalog is manufactured to meet or exceed original equipment specifications, giving marine technicians and boat owners confidence that a part will fit correctly and perform consistently in demanding freshwater and saltwater environments.</p><h3>A Comprehensive Marine Parts Catalog</h3><p>EMP&apos;s product range spans virtually every critical system of a marine engine. The brand&apos;s catalog — organized around outboards, inboard/sterndrive, and specialty marine applications — covers fuel systems, gearcases, engine internals, cooling systems, steering and controls, seals and gaskets, transom components, and propellers. This breadth makes EMP a reliable single-source supplier for multi-system service jobs.</p><p>At the heart of the EMP lineup are <a href="/13199-engineered-marine-products-fuel-pumps-201310">marine fuel pumps</a>, including complete assemblies, VRO replacement units, and repair kits engineered to restore dependable fuel delivery across a wide range of Mercury, Mariner, Johnson, Evinrude, and other popular engine brands. Consistent fuel delivery is foundational to smooth starts and efficient engine operation, and EMP&apos;s fuel system offerings reflect that priority.</p><p>EMP is equally well-regarded for its <a href="/13199-engineered-marine-products-trim-and-tilt-units-201108">trim and tilt units</a> and associated <a href="/13199-engineered-marine-products-tilttrim-motors-201071">tilt/trim motors</a> — the hydraulic and electrical components that give boaters precise control over engine angle. Whether trimming out for high-speed performance or trimming in to navigate shallow water, a reliable tilt/trim system is essential, and EMP parts are engineered to hold up to the corrosive marine environment.</p><p>Below the waterline, EMP&apos;s <a href="/200345-drive-gearcase-parts-engineered-marine-products-13199">drive and gearcase parts</a> — including seal kits, bearing carriers, and clutch components for MerCruiser, OMC, Volvo Penta, Mercury, and other drives — provide the precision fitment that underwater gear systems demand. The brand also carries a broad selection of general RV &amp; marine replacement components suited for maintenance across a wide variety of watercraft.</p><h3>Why Marine Professionals Choose EMP</h3><ul style="list-style:disc"><li><strong>OEM-level fitment:</strong> Parts are designed to match original manufacturer specifications for accurate installation.</li><li><strong>Wide application coverage:</strong> EMP supports Mercury/Mariner, Johnson/Evinrude, MerCruiser, OMC, Volvo Penta, Yamaha, and more.</li><li><strong>Durability in harsh environments:</strong> Components are built to withstand saltwater exposure, vibration, and thermal stress.</li><li><strong>Trusted supply chain:</strong> Over four decades of distribution to OEMs, dealers, and rebuilders worldwide speaks to EMP&apos;s consistency and reliability.</li></ul><p>Whether you&apos;re a professional marine technician stocking a service bay or a boat owner tackling seasonal maintenance, Engineered Marine Products delivers the quality and fitment assurance that keeps engines running season after season.</p>

Part Number

75-08634
09/12/2036 3:53 PM
Sale Price

$32.21

In Stock (7)

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Product Details

The Engineered Marine Products 75-08634 Vernatherm is a precision-engineered temperature control device designed for Johnson and Evinrude outboard engines. This critical cooling system component regulates engine temperature by controlling the flow of cooling water through the engine block, ensuring optimal operating conditions and preventing overheating.

How It Works:

The vernatherm features a brass housing with an internal chamber containing a specially formulated wax mixture that expands at a predetermined temperature. As the engine heats up, the expanding wax pushes a piston upward, lifting a valve to allow hot water to exit the engine. When cooler water enters and the temperature drops, the wax contracts and a return spring closes the valve. At steady speeds, the valve modulates slightly to maintain consistent engine temperature.

Key Features:

  • Direct replacement for BRP/OMC part number 384719
  • Cross-reference: Sierra 18-3560, GLM 75-08634
  • 105-degree operating temperature
  • Precision-calibrated thermal element for accurate temperature control
  • Durable brass construction for marine environment resistance
  • Easy installation in exhaust housing assembly

Application:

This vernatherm is designed for various Johnson and Evinrude 3-cylinder and 4-cylinder outboard engines, typically ranging from 85 to 135 horsepower. It installs in the exhaust housing and works in conjunction with the engine's cooling system to maintain proper operating temperature at all engine speeds.

Important Maintenance Note:

Vernatherms should be inspected regularly for corrosion, sticking, or damage. Replacement is recommended after any engine overheat condition, as high temperatures can damage the internal thermal element. Always verify part number compatibility with your specific engine model before installation.

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