Example photo of thermostat
Example photo of thermostat
BRAND: Cummins | SKU: Cummins 4080631

Cummins 4080631 Replacement Thermostat for the ISC/QSB engines

$48.80 $60.28 $60.28 /
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ISC/QSB Cummins 4080631 Replacement Thermostat

The Cummins 4080631 thermostat is a genuine OEM replacement part created for ISC and QSB diesel engines. Expertly engineered and made in the USA, this thermostat ensures your engine maintains the ideal temperature for smooth operation while preventing overheating. With advanced manufacturing methods and rigorous quality testing, you can be confident that your engine will perform at its factory-specified level.

Compatible Engines

• ISC Diesel Engines
• QSB Diesel Engines

Key Features

• OEM-quality construction guarantees a precise fit and dependable performance.
• Designed to minimize coolant cycling and maintain consistent engine temperatures.
• Supported by a full factory warranty for added peace of mind.
• Manufactured using trusted American processes and premium materials.

Technical Specifications

• Item Number: Cummins 4080631
• Manufacturer Part Number: Cummins 4080631
• By KLM Performance

  • Engine Compatibility: ISC/QSB Diesel Engines
    • Dimensions: 3 x 3 inches

    For proper installation, verify your engine serial number to ensure compatibility. A malfunctioning thermostat can cause inconsistent coolant temperatures and potential engine damage. It is recommended to inspect the cooling system and perform an antifreeze flush as part of routine maintenance. Please note that Cummins parts are non-refundable; accurate part selection is essential.

    For more genuine OEM options, visit our Cummins OEM Replacement Parts collection.

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Customer Reviews

Based on 1 review
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G
Gary A
Perfect Fit

The Cummins 4080631 thermostat was a perfect fit for my ISC/QSB engine. It keeps the engine at the right temperature. Very satisfied!

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