3420987
Torsion Spring
Cummins®

Introduction

The Cummins 3420987 Torsion Spring is a component designed for use in commercial trucks. Its primary function is to provide the necessary tension and stability within the truck’s mechanical systems. This spring plays a role in ensuring the smooth operation of various truck components, contributing to the overall efficiency and reliability of the vehicle ².

Basic Concepts of Torsion Springs

Torsion springs are mechanical devices that store and release rotational energy. They operate by twisting along their axis when a force is applied, and they return to their original position once the force is removed. These springs are commonly used in various applications, including automotive systems, to provide tension, maintain alignment, and facilitate movement in mechanical components ¹.

Role of the 3420987 Torsion Spring in Truck Operation

The 3420987 Torsion Spring is integral to the operation of commercial trucks. It interacts with other components to ensure proper function and performance. Specifically, this spring helps maintain tension in systems where rotational movement is required, such as in the suspension or steering mechanisms. Its role is to provide consistent force, which aids in the stability and control of the truck during operation ².

Key Features

The 3420987 Torsion Spring is characterized by several key features that enhance its performance and durability. It is constructed from high-quality materials, ensuring resistance to wear and corrosion. The design specifications of this spring include precise dimensions and a robust build, allowing it to withstand the rigors of commercial truck use. Additionally, it may possess unique attributes such as a specific torsion rate, which is tailored to meet the demands of its application ².

Benefits

The use of the 3420987 Torsion Spring offers several benefits in truck operations. It contributes to improved performance by providing reliable tension and stability. The durable construction of the spring ensures long-lasting use, reducing the need for frequent replacements. Additionally, its consistent operation enhances the overall reliability of the truck’s mechanical systems ².

Installation Process

Installing the 3420987 Torsion Spring requires careful attention to detail. The process involves securing the spring in its designated position within the truck’s mechanical system. Tools such as wrenches and alignment guides may be necessary to ensure proper installation. Safety precautions, including the use of protective gear and adherence to manufacturer guidelines, should be observed to prevent injury and ensure correct placement ².

Troubleshooting Common Issues

Common issues associated with the 3420987 Torsion Spring may include loss of tension or damage due to wear. Troubleshooting steps involve inspecting the spring for signs of wear or deformation. If issues are detected, the spring may need to be replaced or adjusted to restore proper function. Regular checks can help identify problems early, ensuring continued reliable operation ².

Maintenance Tips

To ensure the longevity and optimal performance of the 3420987 Torsion Spring, regular maintenance is recommended. This includes periodic inspection for signs of wear or damage, ensuring proper alignment, and cleaning the spring to remove any debris that may affect its operation. Adhering to these maintenance practices can help prevent issues and extend the lifespan of the spring ².

Cummins Overview

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its wide range of high-quality products. With a history of innovation and excellence, Cummins has established a strong reputation for producing reliable and efficient components. The company’s product range includes engines, filtration systems, and aftermarket parts, all designed to meet the demanding needs of commercial truck operators ².

Cummins Engine Compatibility with Part 3420987

The Torsion Spring part number 3420987, manufactured by Cummins, is designed to fit a range of Cummins engines. This part is integral to the operation of these engines, ensuring smooth and reliable performance. Below is a detailed overview of the engines that are compatible with this specific torsion spring:

Compatible Engines

• QSV81G
• QSV91-G4 CM558/CM700 V102
• QSV91G
• QSW/QSV82
• QSW27
• QSW36
• QSW73

Grouping of Compatible Engines

The engines listed above can be grouped based on their model series and specifications. For example:

• QSV Series:

  • QSV81G
  • QSV91-G4 CM558/CM700 V102
  • QSV91G
  • QSW/QSV82

• QSW Series:

  • QSW27
  • QSW36
  • QSW73

Each of these engines, despite their differences in model and specifications, share a commonality in the use of the 3420987 Torsion Spring. This part is engineered to meet the specific requirements of these engines, ensuring compatibility and optimal performance ².

Role of Part 3420987 Torsion Spring in Engine Systems

The Part 3420987 Torsion Spring is integral to the efficient operation of various engine components. Its primary function is to provide the necessary tension and return force for components that undergo cyclic motion. Here’s how it interfaces with the provided engine systems:

Valve Train System

In the valve train system, the torsion spring works in conjunction with the valve tappet, valve tappet assembly housing, and valve assembly tappet. It ensures that the valve tappet returns to its original position after being actuated by the cam and cam assembly follower. This consistent return motion is essential for precise valve timing and efficient engine performance ².

Rocker and Lever Mechanisms

The torsion spring is also employed in the rocker assembly lever and lever systems. It provides the necessary tension to keep the rocker in constant contact with the valve tappet and cam. This ensures smooth transmission of motion from the camshaft to the valves, contributing to reliable valve operation ².

Fuel Injection System

In the fuel injection system, the torsion spring plays a role in the fuel injection pump and fuel injection assembly pump. It assists in the precise movement of the pump components, ensuring that fuel is delivered at the correct pressure and timing. The torsion spring’s role in the fuel injection pump assembly helps maintain consistent fuel delivery, which is vital for engine efficiency and performance ².

Tappet and Follower Assemblies

The torsion spring is utilized in the assembly tappet and cylinder block. It provides the required tension for the tappet to follow the contours of the cam accurately. This ensures that the valve opens and closes at the correct intervals, which is fundamental for the engine’s combustion process ².

Oil Fill and Housing Arrangements

In the oil fill assembly arrangement and housing valve tappet mounting, the torsion spring helps maintain the structural integrity and operational efficiency of these components. It ensures that moving parts within these assemblies return to their neutral positions, facilitating smooth operation and reducing wear ².

Overall Engine Performance

By providing the necessary tension and return force in these critical engine components, the Part 3420987 Torsion Spring contributes to the overall reliability and performance of the engine. Its role in ensuring precise and consistent component movement is indispensable for the engine’s efficient operation ².

Conclusion

The Cummins 3420987 Torsion Spring is a vital component in the operation of commercial trucks and Cummins engines. Its role in providing tension and stability to various mechanical systems ensures the smooth and reliable performance of the vehicle. Regular maintenance and proper installation are essential to maximize the lifespan and efficiency of this part. Understanding its function and compatibility with specific engine models can help in maintaining optimal engine performance and reliability ².