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Engineered Marine Products 75-03948 Thermostat Kit 140 Degree for MerCruiser V6 V8 GM Engines

Manufacturer

Engineered Marine Products

<h3>About Engineered Marine Products (EMP)</h3><p><strong>Engineered Marine Products</strong>, widely known in the boating world as <strong>EMP</strong>, has been a trusted name in marine parts manufacturing for over 40 years. The company supplies OEMs, distributors, dealers, and rebuilders worldwide with high-quality aftermarket components engineered to meet or exceed original equipment manufacturer (OEM) specifications. Whether you maintain a weekend fishing boat or a performance inboard, EMP&apos;s extensive catalog is built to keep marine engines running reliably season after season.</p><h3>A Marine Parts Specialist Built on Engineering Precision</h3><p>EMP&apos;s foundation is precision manufacturing. Their design and production processes leverage modern engineering technology, with a focus on dimensional accuracy, material quality, and long-term durability in the demanding marine environment. Salt spray, constant vibration, wide temperature swings, and moisture ingress are realities every marine component must survive — and EMP engineers its parts with exactly those conditions in mind.</p><p>The brand&apos;s catalog spans a remarkably wide range of marine engine subsystems. From cooling and fuel delivery to gearcases, propellers, transom components, and steering systems, EMP offers solutions for outboard engines from manufacturers including Mercury/Mariner, Yamaha, BRP (Johnson/Evinrude), and Force, as well as inboard/sterndrive platforms such as MerCruiser, OMC, and Volvo Penta.</p><h3>Ignition and Electrical Components</h3><p>One of EMP&apos;s most comprehensive product areas is marine ignition and electrical systems. Their <a href="/13199-engineered-marine-products-ignition-control-module-10488">Ignition Control Modules</a> and related ignition components cover a broad spectrum of inboard and outboard applications — from distributor caps and rotors for Volvo Penta V8 engines to ignition coil assemblies compatible with MerCruiser 3.0L through 8.4L GM-based powerplants and OMC configurations. Reliable spark delivery is critical to engine performance and starting consistency on the water, and EMP&apos;s ignition lineup is designed to deliver dependable output across the entire RPM range.</p><h3>Gaskets, Seals, and Engine Integrity</h3><p>Keeping a marine engine leak-free is just as important as keeping it firing correctly. EMP&apos;s <a href="/13199-engineered-marine-products-gaskets-seals-201268">Gaskets &amp; Seals</a> lineup addresses the full range of engine and gearcase sealing needs — including gearcase seal kits, Teflon lip seals, fuel injector crush ring kits, and comprehensive engine gasket sets. Proper sealing prevents water intrusion, oil loss, and exhaust leaks that can quickly sideline a boat and lead to expensive engine damage.</p><h3>Why Boaters and Technicians Choose EMP</h3><ul style="list-style:disc"><li><strong>OEM-Grade Quality:</strong> Parts are engineered to meet or exceed original manufacturer specifications, ensuring proper fit and reliable function.</li><li><strong>Broad Application Coverage:</strong> EMP covers major outboard and inboard/sterndrive platforms from leading marine engine brands.</li><li><strong>Trusted Supply Chain:</strong> EMP products are sold through OEMs, distributors, and dealers globally, reflecting deep industry confidence in the brand.</li><li><strong>40+ Years of Manufacturing Heritage:</strong> Decades of marine-specific engineering experience inform every product in the EMP lineup.</li></ul><p>For boat owners, marine technicians, and engine rebuilders who demand components they can count on, Engineered Marine Products delivers the quality and application coverage to get the job done right.</p>

Part Number

75-03948
09/12/2036 5:25 AM
Sale Price

$21.99

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

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Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Engineered Marine Products 75-03948 is a complete thermostat kit designed for 1983 and later MerCruiser V6 and V8 non-high performance GM engines with standard cooling systems. This kit maintains optimal engine temperature at 140°F (60°C) while ensuring proper pressure in the cooling system for efficient heat transfer from the cylinder heads and walls.

Complete Kit Includes:

  • 140-degree (60°C) thermostat
  • Assortment of gaskets
  • O-ring seal

Key Features:

  • Fits 4.3L V6, 5.0L, 5.7L, 7.4L, and 8.2L marine engines
  • Precision-engineered for reliable temperature control
  • Durable construction designed to withstand harsh marine environments
  • Helps prevent engine overheating and maintains proper cooling system pressure
  • Manufactured to OEM specifications for optimal performance

Cross-Reference Numbers: Replaces Mercruiser/Mercury Marine/Quicksilver 807252Q4, 807252T4, 807252, 23-47508T | Sierra 18-3668 | GLM 13390 | Mallory 9-43150

Regular thermostat replacement is recommended after any engine overheat condition, as thermostats can be damaged by corrosion, sticking, or exposure to extremely high temperatures.

Ordering went extremely smooth

great prices & shipping

No Problem. Would like to use USPS express shipping. cheaper

Great Deals, Awesome experience so far!

Fast and convenient!

GOOD EXPERIENCE

The order was shipped promptly, and everyone was is good working condition. I will order from here again!!

Awesome. Hopefully it will be the right part....

Great Price on products and Shipping

Easy site Good Experience.

Very good

great price. here's to hoping for fast shipping.

Fast

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