3900242
Retaining Ring
Cummins®

The 3900242 Retaining Ring is a component manufactured by Cummins, a well-established name in the automotive and heavy-duty truck industry. This retaining ring is designed to secure various components within the truck’s mechanical systems, ensuring they remain in place under operational conditions. Cummins is recognized for producing reliable and high-quality parts that contribute to the efficiency and durability of heavy-duty trucks ¹.

Basic Concepts of Retaining Rings

Retaining rings, also known as circlips, are mechanical fasteners used to prevent components from moving along a shaft or within a housing. They are commonly employed in various mechanical systems to secure gears, bearings, and other parts. Retaining rings function by fitting into a groove and exerting a radial force that holds the component in position, preventing axial movement ².

Purpose of the 3900242 Retaining Ring

The 3900242 Retaining Ring plays a specific role in the operation of heavy-duty trucks. It is associated with systems where secure fastening of components is required to maintain operational integrity. This includes applications within the engine, transmission, and other drivetrain components where parts must remain fixed to ensure smooth and reliable performance ³.

Key Features

The 3900242 Retaining Ring is characterized by its design and material properties, which include high durability, resistance to wear, and ease of installation. Made from materials that can withstand the rigors of heavy-duty truck environments, this retaining ring is engineered to provide a secure fit that lasts throughout the component’s operational life. Its design allows for straightforward installation and removal, facilitating maintenance and repair processes ⁴.

Benefits

Utilizing the 3900242 Retaining Ring offers several advantages. It enhances the reliability of the secured components by ensuring they remain in place under various operational conditions. This can lead to potential cost savings by reducing the need for frequent repairs or replacements. Additionally, the secure fastening provided by the retaining ring can contribute to enhanced performance of the truck’s mechanical systems ¹.

Installation Process

Installing the 3900242 Retaining Ring involves a series of steps to ensure it is correctly positioned and secured. The process typically requires specific tools, such as retaining ring pliers, to safely and accurately place the ring into the designated groove. Careful attention to the orientation and seating of the ring is crucial to ensure it functions as intended ².

Troubleshooting and Maintenance

Common issues with retaining rings may include improper seating, damage from wear, or failure to secure components effectively. Identifying these issues involves inspecting the ring and the components it secures for signs of movement, wear, or damage. Maintenance tips for the 3900242 Retaining Ring include regular inspection for wear and ensuring it is correctly installed to maintain its effectiveness over time ³.

Cummins: Manufacturer Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, emissions solutions, and related technologies. With a strong reputation in the automotive and heavy-duty truck industry, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive product range and global presence underscore its leadership in providing reliable and efficient power solutions ⁴.

Cummins Engine Part 3900242: Retaining Ring Compatibility

The Cummins part 3900242, a Retaining Ring, is a critical component that ensures the proper functioning of various engine systems. This part is designed to fit seamlessly into a range of Cummins engines, providing stability and security to the components it supports. Below is a detailed overview of the engines with which this retaining ring is compatible.

Compatible Engines

• 4B3.9
• 6B5.9
• B3.9 G
• B4.5
• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556
• B6.7S
• G5.9
• G5.9 CM558
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127
• ISB5.9G CM2180
• QSB3.9 30 CM550
• QSB3.9 CM2880 B138
• QSB5.9 30 CM550
• QSB5.9 CM2880 B139
• QSB5.9 CM550
• QSB5.9G

Grouping of Compatible Engines

The retaining ring is compatible with a diverse set of Cummins engines, which can be grouped based on their model series and specifications:

• B Series Engines

  • B3.9 G
  • B4.5
  • B5.9 CM2670 B166C
  • B5.9 G
  • B5.9 GAS PLUS CM556

• G Series Engines

  • G5.9
  • G5.9 CM558

• ISB Series Engines

  • ISB3.9 CM2220 B107
  • ISB5.9 CM2880 B127
  • ISB5.9G CM2180

• QSB Series Engines

  • QSB3.9 30 CM550
  • QSB3.9 CM2880 B138
  • QSB5.9 30 CM550
  • QSB5.9 CM2880 B139
  • QSB5.9 CM550
  • QSB5.9G

• Other Models

  • 4B3.9
  • 6B5.9
  • B6.7S

This compatibility ensures that the retaining ring can be used across a wide range of engine models, providing a versatile solution for maintaining engine integrity and performance.

Role of Part 3900242 Retaining Ring in Engine Systems

In the intricate assembly of engine systems, the retaining ring, specifically part 3900242, plays a significant role in ensuring the secure and efficient operation of various components. This component is instrumental in maintaining the structural integrity and functional reliability of the engine’s moving parts.

Application in Lever and Rocker Mechanisms

The retaining ring is essential in the assembly of levers and rockers within the engine system. It secures these components in place, preventing any unwanted movement that could lead to misalignment or failure. In the case of the lever, the retaining ring ensures that it remains firmly attached to its pivot point, allowing for smooth and consistent operation. Similarly, for the rocker, the retaining ring plays a key role in maintaining the connection between the rocker and its support structure, ensuring that it can effectively transfer motion without any slippage or detachment ².

Integration with Rocker Lever Support

In the context of the rocker lever support, the retaining ring is used to secure the rocker lever to its support. This is vital for the proper functioning of the valve train, as it ensures that the rocker lever can accurately and reliably transmit motion from the camshaft to the valves. The retaining ring’s role here is to provide a stable and secure connection, which is essential for the precise operation of the engine’s valve timing ³.

Functionality in Rocker Levers

For rocker levers, the retaining ring is employed to hold the lever in place on its pivot point. This is particularly important in high-performance engines where the forces acting on the rocker lever are significantly greater. The retaining ring ensures that the rocker lever can withstand these forces without dislodging, thereby maintaining the engine’s performance and durability ⁴.

Conclusion

In summary, the 3900242 Retaining Ring is a fundamental component in the secure and efficient operation of levers, rockers, and their associated supports within engine systems. Its application across these components underscores its importance in maintaining the structural and functional integrity of the engine.