4007239
Plain Washer
Cummins®

Introduction

The Cummins 4007239 Plain Washer is a component designed for use in commercial trucks. It serves a specific function within the truck’s mechanical system, contributing to the overall efficiency and reliability of the vehicle. Understanding its purpose and role is fundamental for maintaining and repairing commercial trucks effectively.

Basic Concepts of Plain Washers

Plain washers are simple yet vital components in mechanical systems. They are typically flat, annular metal rings that are placed under bolt heads or nuts. Their primary function is to distribute the load of the fastener more evenly across a surface, preventing damage to the material being fastened. Additionally, plain washers can provide a degree of cushioning and help to prevent loosening of the fastener due to vibration ¹.

Purpose of the Cummins 4007239 Plain Washer

The Cummins 4007239 Plain Washer is specifically engineered to play a role in the fastening systems of commercial trucks. It is utilized to ensure that the load from bolts and nuts is distributed evenly across the surfaces they are securing. This helps in maintaining the integrity of the fastening, reducing the risk of damage to the components being joined, and ensuring that the fasteners remain secure under the dynamic conditions experienced by commercial trucks.

Key Features

The Cummins 4007239 Plain Washer is characterized by several key features that distinguish it from other plain washers. It is typically made from high-quality steel, ensuring durability and resistance to wear. The design of the washer is straightforward, with a flat surface and a hole in the center to accommodate the fastener. Its dimensions are precisely engineered to fit specific applications within Cummins engines and related systems, ensuring optimal performance and compatibility.

Benefits

The use of the Cummins 4007239 Plain Washer offers several benefits. It enhances load distribution, which is crucial for maintaining the structural integrity of the components being fastened. By providing a cushion between the fastener and the surface, it helps to reduce wear on both the fastener and the surface. Additionally, the washer contributes to the overall reliability of the fastening system, ensuring that components remain securely joined under various operating conditions ².

Installation and Usage

Proper installation of the Cummins 4007239 Plain Washer is key to its effective function. It should be placed under the head of a bolt or beneath a nut, ensuring that it is correctly aligned with the fastener. When used in truck maintenance and repair, it is important to follow manufacturer guidelines for torque specifications and fastening procedures to ensure that the washer and fastener system operate as intended.

Troubleshooting and Maintenance

Common issues with plain washers include wear, deformation, or failure due to excessive load or vibration. Regular inspection during maintenance checks can help identify these issues early. Signs of wear or failure may include visible deformation of the washer, increased play in the fastener, or evidence of surface damage where the washer is applied. Replacing worn or damaged washers is a straightforward process that can prevent more significant issues within the truck’s mechanical system ³.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a rich history dating back to 1919, Cummins has established a strong reputation within the commercial truck industry for producing reliable and high-performance engines and components. The company’s extensive product range and commitment to innovation and quality make it a preferred choice for commercial vehicle manufacturers and operators worldwide.

Cummins Engine Part 4007239: Plain Washer

The Cummins part 4007239, a Plain Washer, is a critical component in the assembly of various Cummins engines. This part is designed to provide a smooth and even surface, ensuring that the engine operates efficiently and reliably. The Plain Washer is used in several Cummins engine models, including the QSK78 and CM500 series.

Application in Cummins Engines

QSK78 Series

The QSK78 series engines are known for their robust performance and reliability, often used in heavy-duty applications such as marine and power generation. The Plain Washer 4007239 plays a vital role in these engines by ensuring proper sealing and alignment of various components. Its placement is critical in maintaining the integrity of the engine’s internal systems, contributing to the overall efficiency and longevity of the engine.

CM500 Series

The CM500 series engines are designed for on-highway applications, providing a balance of power and fuel efficiency. In these engines, the Plain Washer 4007239 is used to maintain the alignment and stability of moving parts, reducing friction and wear. This component is essential in ensuring that the engine’s internal mechanisms function smoothly, contributing to the engine’s overall performance and durability.

Importance of the Plain Washer

The Plain Washer 4007239 is a fundamental part in the assembly of Cummins engines. Its primary function is to provide a flat surface that ensures proper alignment and sealing of components. This is crucial in preventing leaks and maintaining the efficiency of the engine. Additionally, the washer helps to distribute pressure evenly, reducing the risk of damage to other parts.

By ensuring that all components are properly aligned and sealed, the Plain Washer 4007239 contributes to the overall reliability and performance of Cummins engines. This part is a testament to Cummins’ commitment to quality and durability, ensuring that their engines can withstand the demands of various applications.

Role of Part 4007239 Plain Washer in Engine Systems

In engine systems, the part 4007239 Plain Washer is utilized in various components to ensure smooth operation and reduce wear.

Lever Mechanisms

In lever mechanisms, the Plain Washer is positioned between the lever and its mounting point. This placement helps in distributing the load evenly across the contact surfaces, minimizing the risk of galling and wear. It also allows for a slight degree of movement, which can accommodate minor misalignments and reduce stress on the lever. This is particularly important in high-cycle applications where consistent performance is required.

Rocker Arms

For rocker arms, the Plain Washer is often used at the pivot points where the rocker arm contacts the camshaft or valve stem. By introducing a low-friction interface, the Plain Washer facilitates smoother motion of the rocker arm. This reduces the likelihood of binding and ensures that the valve opens and closes with precision. Additionally, the washer helps in dampening vibrations that could otherwise lead to premature wear of the rocker arm or camshaft.

In both applications, the Plain Washer plays a significant role in maintaining the integrity and efficiency of the engine’s moving parts. Its simple yet effective design contributes to the overall reliability and longevity of the engine system.

Conclusion

The Cummins 4007239 Plain Washer is a vital component in the maintenance and operation of commercial trucks and Cummins engines. Its role in distributing load, preventing damage, and ensuring secure fastenings is crucial for the reliability and efficiency of these vehicles. Proper installation, regular maintenance, and timely replacement of worn washers are essential practices to uphold the performance and longevity of the truck’s mechanical systems.