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Dodge Cummins Coolant Bypass Kit
Overview

Maximize Performance. Minimize Heat. Protect Your Engine.

Overheating rear cylinders are robbing your 1998.5-2018 Dodge Cummins 5.9L & 6.7L of power and longevity-fix it in under 30 minutes with the Motorsport Diesel Coolant Bypass Kit. Engineered for superior cooling efficiency, this billet aluminum kit relieves excess pressure, reduces water pump strain, and prevents costly engine wear. Featuring a precision pressure relief valve, it dynamically regulates flow-something a thermostat simply can’t do. Whether you’re towing, daily driving, or chasing horsepower, this is the upgrade your Cummins can’t afford to go without. Get yours now and keep your engine running stronger, longer.

Product information

Improve your Dodge Cummins engine’s performance and cooling efficiency with the Motorsport Diesel Coolant Bypass Kit – designed for 1998.5-2018 Dodge Cummins 5.9L or 6.7L engines. This precision-engineered kit is built for superior cooling efficiency, improved performance, and easy installation. Ideal for 2nd Gen and newer applications, including trucks with EGR deletes, this kit is the perfect upgrade for your truck.

Engineers didn’t exactly do your rear cylinders any favors when designing the Cummins cooling system-coolant pressures can exceed 90 PSI back there, leading to excessive heat buildup. This bypass kit solves that problem by relieving excess pressure and improving coolant circulation where your engine needs it most.

Key Features:

  • Boosted Performance: Reduces parasitic power losses from the water pump.
  • Enhanced Cooling: Ensures even coolant distribution, preventing hotspots in the rear cylinders.
  • Prevents Air Entrapment: Designed to avoid air pockets in the coolant system by maintaining the optimal installation height.
  • Wide Compatibility: Compact, lightweight, and designed to clear virtually all turbocharger configurations. This kit is also fully compatible with EGR-deleted trucks.
  • Durable & Built to Last: Made from billet aluminum, featuring braided lines, AN fittings, and stainless steel hardware.
  • Plug & Play Installation: Installs in under 30 minutes-no guesswork, no headaches, it’s a “set it and forget it” solution.

Why a Pressure Relief Valve?

The pressure relief valve is the key to this system’s success. Unlike traditional thermostats that can stick or fail, our pressure relief valve operates based on coolant pressure (not temperature) and adjusts flow demand accordingly. When coolant pressure reaches the optimal level, the valve opens, allowing hotter coolant to be redirected back to the radiator. This ensures that your engine stays within its ideal operating temperature, preventing increased cylinder wear due to improper thermal expansion.

Whether you’re daily driving, towing heavy, or pushing serious horsepower, this coolant bypass kit is the insurance your Cummins deserves. Keep your engine cool, running strong, and free from unnecessary wear.

Fits:

1998.5-2018 Dodge Cummins 5.9L & 6.7L

  • 1998.5-2002 – 2nd Gen
  • 2003–2009 – 3rd Gen
  • 2009–2018 – 4th Gen

Upgrade your cooling system today-your engine will thank you.

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