Valve Tappet Cummins 3968344 | 3965370, 3945858, 3958717

High-Performance Valve Tappet for Cummins Engines

The Cummins 3968344 valve tappet (also known as a roller lifter) is a critical component designed to maintain precise valve timing and ensure smooth engine operation. Located in the engine’s valvetrain, this heavy-duty roller tappet transfers motion from the camshaft to the pushrods and valves, converting rotational force into linear movement. This part is also available under the numbers: 3965370, 3945858, 3958717.

Engineered to withstand extreme mechanical stress and high operating temperatures, this valve tappet is built from premium-grade wear-resistant materials. It features a 28mm (1.230-inch) outer diameter roller design that minimizes friction against the camshaft lobes, reducing wear and extending the service life of your engine’s internal components.

Engine Compatibility & Fitment

This valve tappet is designed for heavy-duty applications and is compatible with the following Cummins engine models:

• Cummins ISL / ISC (8.9L) – Commonly used in medium and heavy-duty trucks, buses, and industrial equipment.
• Cummins QSL / QSL9 – Widely utilized in agricultural, construction, and marine applications.
• Block Compatibility: Specifically dedicated to older versions of engine block 4089242.

Key Features and Specifications

• Precise Valve Timing: Ensures accurate opening and closing of intake and exhaust valves for optimal combustion efficiency.
• Roller Design: Features a high-durability roller with a 28mm (1.230″) outer diameter to reduce friction and camshaft wear.
• Heavy-Duty Construction: Manufactured from high-strength steel alloy to resist pitting, scuffing, and corrosion.
• Direct Fit: Built to exact dimensional tolerances for a seamless installation and reliable performance.

Cross-Reference / Interchange Part Numbers

This part replaces / is interchangeable with the following part numbers:

• 3968344
• 3965370
• 3945858
• 3958717
• 700856AT