3871218
Rectangular Ring Seal
Cummins®

The 3871218 Rectangular Ring Seal, manufactured by Cummins, is a specialized component designed for use in commercial trucks. This seal is integral to maintaining the integrity of various systems within these vehicles, ensuring efficient and reliable operation.

Basic Concepts of Rectangular Ring Seals

Rectangular ring seals are mechanical components used to create a seal between two surfaces. They function by being compressed between a gland and a mating surface, which creates a barrier that prevents the leakage of fluids or gases. These seals are commonly used in applications where there is relative motion between the sealing surfaces, such as in pistons, cylinders, and various types of pumps and valves ¹.

Purpose and Function in Truck Operation

In the operation of commercial trucks, the Rectangular Ring Seal 3871218 plays a role by providing a reliable seal in environments where there is significant movement and pressure. It is typically placed in areas where it interfaces with pistons or other moving parts, ensuring that fluids remain contained within their designated pathways. This seal interacts with other components to maintain system pressure and prevent contamination, which is vital for the efficient functioning of the truck’s engine and other systems ².

Key Features

The Rectangular Ring Seal 3871218 is characterized by several key features that enhance its performance. It is made from a durable material that can withstand high pressures and temperatures commonly encountered in commercial truck engines. The design of the seal includes precise dimensions that ensure a snug fit within the gland, promoting effective sealing. Additionally, the seal may incorporate unique attributes such as anti-extrusion elements to further enhance its durability and reliability in demanding applications.

Benefits

Utilizing the Rectangular Ring Seal 3871218 offers several advantages. Its design contributes to improved sealing efficiency, which helps in maintaining system integrity and performance. The seal’s durability ensures long-term reliability, reducing the need for frequent replacements. Furthermore, its resistance to various operating conditions, including high temperatures and pressures, makes it suitable for the rigorous demands of commercial truck applications ³.

Troubleshooting and Maintenance

Common issues with rectangular ring seals may include leaks or seal failure due to wear and tear or improper installation. Troubleshooting these problems involves inspecting the seal for signs of damage or deformation and ensuring that it is correctly installed within the gland. Regular maintenance practices, such as checking for proper alignment and condition of the seal, can help ensure its longevity and optimal performance. Additionally, adhering to manufacturer guidelines for replacement intervals can prevent unexpected failures.

About Cummins

Cummins is a renowned manufacturer with a long-standing reputation in the automotive and heavy-duty truck industries. The company is known for its commitment to producing high-quality components that meet the demanding requirements of commercial vehicles. With a history of innovation and excellence, Cummins continues to be a trusted name in the industry, providing reliable and durable parts that contribute to the efficient operation of trucks and other machinery.

Cummins Rectangular Ring Seal (Part 3871218) Compatibility

The Cummins Rectangular Ring Seal, identified by part number 3871218, is a critical component designed to ensure the integrity of various engine systems. This seal is engineered to fit seamlessly with a range of Cummins engines, providing a reliable barrier against leaks and maintaining system pressures.

ISX Series Engines

• ISX CM570
• ISX CM870
• ISX CM871

The ISX series engines, including the CM570, CM870, and CM871 variants, are high-performance engines known for their durability and efficiency. The Rectangular Ring Seal is specifically designed to fit these engines, ensuring optimal performance and longevity.

ISX15 Series Engines

• ISX15 CM2250
• ISX15 CM2250 SN
• ISX15 CM2350 X101

The ISX15 series engines, such as the CM2250, CM2250 SN, and CM2350 X101, are part of Cummins’ advanced lineup. The Rectangular Ring Seal is engineered to integrate perfectly with these engines, providing a robust seal that is essential for maintaining system integrity.

QSX15 Series Engines

• QSX15 CM2250 ECF
• QSX15 CM2350 X105

The QSX15 series engines, including the CM2250 ECF and CM2350 X105, are designed for heavy-duty applications. The Rectangular Ring Seal is compatible with these engines, ensuring that they operate efficiently and reliably under demanding conditions.

X15 Series Engines

• X15 CM2350 X116B
• X15 CM2350 X123B
• X15 CM2450 X134B

The X15 series engines, such as the CM2350 X116B, CM2350 X123B, and CM2450 X134B, are part of Cummins’ extensive engine portfolio. The Rectangular Ring Seal is designed to fit these engines, providing a critical seal that helps maintain system pressures and prevent leaks.

Role of Part 3871218 Rectangular Ring Seal in Engine Systems

The 3871218 Rectangular Ring Seal is an essential component in various engine systems, ensuring the integrity and efficiency of several critical assemblies. Its primary function is to provide a reliable seal in high-stress environments, preventing leaks and maintaining system pressure.

Brake Systems

In the Brake Campaign Kit and Brake Overhaul Kit, the 3871218 Rectangular Ring Seal is utilized to ensure that hydraulic fluid remains contained within the system. This seal is positioned between the Housing and the Flywheel, where it prevents fluid leakage that could compromise braking performance. Similarly, in the Engine Brake Solenoid and Engine Brake Solenoid Kit, this seal ensures that the solenoid operates within the designed pressure parameters, contributing to consistent brake engagement.

Engine Brake Systems

For the Engine Brake Tune-Up Kit and ISX Brake Tune-Up, the 3871218 Rectangular Ring Seal plays a significant role in maintaining the seal between the Engine Brake Valve and its housing. This ensures that the valve functions correctly without any loss of pressure, which is vital for the effective operation of the engine brake system.

Rocker Lever Assemblies

In the Rocker Lever Assembly and Rocker Lever Top Level Assembly, the seal is employed to maintain the integrity of the hydraulic system that actuates the rocker levers. By preventing fluid leaks, it ensures that the rocker levers operate smoothly and efficiently, contributing to the overall performance of the engine.

Solenoid and Tune-Up Kits

The Solenoid Kit and Tune-Up Kit (430) also benefit from the 3871218 Rectangular Ring Seal. In these applications, the seal is crucial for maintaining the pressure within the solenoid circuits, ensuring that the solenoids activate and deactivate as intended. This is particularly important in systems where precise control of engine components is required.

Repair Kits

Both the Major Repair Kit and Minor Repair Kit incorporate the 3871218 Rectangular Ring Seal to restore the sealing surfaces in worn or damaged engine components. Its inclusion in these kits ensures that repaired systems return to optimal performance levels, with no risk of fluid leaks disrupting operation.

Conclusion

In summary, the 3871218 Rectangular Ring Seal is a versatile component that enhances the reliability and efficiency of various engine and brake systems by providing essential sealing functions. Its compatibility with a wide range of Cummins engines and its role in critical assemblies underscore its importance in maintaining the performance and longevity of commercial trucks.