KM 4BT, 4 Cylinder Tappet Cover (062413-1NP) For Cummins 4BT 3.9L 4-Cylinder Engines

Billet Tappet Cover Overview

The KM 4BT Billet Tappet Cover is a precision-machined upgrade for Cummins 4BT 3.9L 4-cylinder engines. Keating Machine machines this cover from high-quality billet aluminum to replace the factory stamped steel unit, improving strength, sealing reliability, and long-term durability.

Design and Fitment

This tappet cover installs as a direct bolt-on for Cummins 4BT engines commonly found in industrial, commercial, off-road, and custom swap applications. As a result, it delivers a clean installation without modification while maintaining proper alignment and fitment.

Sealing and Reliability

The cover features a machined O-ring groove with included O-ring, which provides a consistent, leak-resistant seal. This design helps prevent oil seepage caused by vibration, heat, and pressure, making it well suited for turbocharged builds, high-duty cycles, and performance applications.

Construction and Appearance

Billet aluminum construction eliminates the flex and long-term wear associated with OEM steel covers. In addition, the upgraded design offers a cleaner, more refined appearance that works well in custom engine bays, swap projects, and restored industrial equipment.

Why It’s a Smart Upgrade

Built for durability and dependable sealing, this billet tappet cover provides a functional and visual upgrade for Cummins 4BT owners who demand reliability in demanding environments.

🧩 Features

• CNC-machined billet aluminum construction

• Direct bolt-on fit for Cummins 4BT engines

• Integrated O-ring sealing system (O-ring included)

• Improved leak resistance over OEM stamped steel

• Suitable for industrial, off-road, and swap applications