KM 4BT 4 Cylinder Tappet Cover with Breather (062413-1B) for Cummins 4BT 4-Cyl Engines

Billet Tappet Cover for Cummins 4BT Engines

The Keating Machine 4BT 4-Cylinder Billet Tappet Cover with Breather is a precision-machined upgrade for Cummins 4BT engines used in industrial, off-road, and custom swap applications. CNC-machined from high-quality billet aluminum, this cover replaces the factory stamped steel tappet cover with a stronger, more reliable solution that resists flex and oil seepage.

An integrated breather port improves crankcase ventilation by allowing excess pressure and oil vapor to escape efficiently. This design supports cleaner engine operation and helps maintain stable crankcase pressure, especially in turbocharged, high-load, or continuous-duty applications. Internal baffling controls oil movement and reduces the chance of oil mist escaping through the breather.

The machined O-ring sealing system eliminates the need for traditional gaskets. This design provides consistent sealing under heat and vibration while simplifying installation and long-term maintenance. Stainless steel mounting hardware is included to ensure corrosion resistance and reliable service over time.

Because this cover follows the standard 4BT tappet pattern, it installs as a direct bolt-on replacement without modification. It works well for performance builds, engine swaps, restorations, and heavy-use industrial engines where durability and clean operation matter.

Built for Durability and Clean Operation

This billet tappet cover improves both strength and functionality compared to OEM components. Billet aluminum construction prevents flex, while the integrated breather enhances ventilation and oil control. Together, these features support longer service life and cleaner engine performance in demanding environments.