3947759
Valve Tappet
Cummins®

Introduction

The Cummins 3947759 Valve Tappet is a crucial component in commercial truck engines, facilitating the actuation of valves essential for intake and exhaust processes. Understanding its function and significance aids in maintaining engine efficiency and reliability.

Basic Concepts of Valve Tappets

A valve tappet, or lifter, is a mechanical device in internal combustion engines that transfers motion from the camshaft to the valves. It ensures the air-fuel mixture enters the combustion chamber at the right time and that exhaust gases are expelled efficiently ¹.

Role of the 3947759 Valve Tappet in Truck Operation

This Cummins part is integral to the engine’s valve train system, transmitting motion from the camshaft to the valves to ensure they open and close in sync with engine operation. This contributes to overall engine performance by maintaining the timing and efficiency of the valve actuation process ².

Key Features of the 3947759 Valve Tappet

The Valve Tappet is constructed from high-quality materials to withstand the rigors of commercial truck engine operation. Its dimensions are precisely engineered for a smooth fit within the engine’s valve train system. It may also feature a specific surface finish or internal design that reduces friction and wear ³.

Benefits of Using the 3947759 Valve Tappet

Using this part offers advantages such as improved engine efficiency through minimal friction and maximum precision in valve operation. This leads to reduced wear and tear on engine components and enhanced reliability, crucial for commercial truck applications.

Troubleshooting Common Issues with Valve Tappets

Identifying and addressing common problems with valve tappets is vital for maintaining engine performance. Symptoms of wear may include unusual engine noises, such as ticking or tapping sounds. Potential causes include improper lubrication, debris in the engine, or manufacturing defects. Regular inspection and maintenance can help prevent these issues.

Maintenance Tips for Valve Tappets

To ensure optimal performance and longevity of valve tappets, regular inspection intervals and proper lubrication are essential. Following replacement guidelines ensures that worn or damaged valve tappets are replaced promptly.

Cummins: A Brief Overview

Cummins Inc. is renowned in the commercial truck industry for its commitment to innovation and quality. The company produces reliable and high-performance engines, enhancing engine efficiency, durability, and overall performance.

Valve Tappet 3947759 Compatibility with Cummins Engines

The Valve Tappet 3947759 is compatible with various Cummins diesel engines, ensuring smooth operation and engine performance longevity. It is designed to fit seamlessly with a range of Cummins engines.

Compatible Engines

B Series Engines

• B4.5 CM2350 B129B
• B5.6 CM2670 B152B
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C

F Series Engines

• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F3.8 F102
• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

ISB Series Engines

• ISB (Chrysler)
• ISB CM2150
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB4.5 CM2350 B104
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118

ISBE Series Engines

• ISBE CM2150
• ISBE CM800

G Series Engines

• B6.7 G CMOH6.0 B125
• B6.7S

Role of Part 3947759 Valve Tappet in Engine Systems

The Valve Tappet, identified by part number 3947759, is integral to the operation of various engine systems. It interfaces directly with the camshaft and the valve mechanism, ensuring precise and efficient valve actuation.

Interaction with the Cylinder Block

Within the valve train assembly, the Valve Tappet transmits motion from the camshaft to the valves, facilitating the opening and closing of the intake and exhaust valves at the correct times. This ensures optimal airflow into and out of the combustion chamber, essential for engine performance.

Integration in the Cylinder Block Kit

In a cylinder block kit, the Valve Tappet is a key component that must be in good condition to ensure the kit functions as intended. It maintains the integrity of the valve train, allowing for smooth operation post-rebuild.

Function in the Long Block and Long Block Kit

In a long block or long block kit, which includes the cylinder block, crankshaft, pistons, connecting rods, and valve train components, the Valve Tappet ensures that the valve train components operate harmoniously, contributing to the overall efficiency and reliability of the engine.

Role in the Short Block and Short Block Kit

For the short block, which consists of the cylinder block, crankshaft, pistons, and connecting rods but excludes the valve train, the Valve Tappet is not directly part of this assembly. However, when integrating a short block kit with valve train components, the Valve Tappet becomes essential. It connects the camshaft to the valves, ensuring that the valve timing is accurate and that the engine runs smoothly.

Summary of Component Interaction

• Cylinder Block: The Valve Tappet ensures precise valve actuation within the cylinder block.
• Cylinder Block Kit: Essential for maintaining valve train integrity post-rebuild.
• Long Block and Long Block Kit: Critical for the harmonious operation of valve train components.
• Short Block and Short Block Kit: Necessary for accurate valve timing when integrating with valve train components.

Conclusion

Understanding the role of the Valve Tappet in these engine systems highlights its importance in ensuring efficient and reliable engine performance. Regular maintenance and proper use of this part contribute significantly to the longevity and efficiency of commercial truck engines.