3906704
O Ring Seal
Cummins®

The Cummins 3906704 O Ring Seal is a component used in commercial truck maintenance. It is designed to provide a reliable seal in various applications within the truck’s systems. The seal’s role is to prevent leaks and ensure the efficient operation of the truck’s components.

Basic Concepts of O Ring Seals

O Ring Seals are circular rings, typically made from elastomers, that create a seal when compressed within a groove. They function by filling the space between mating parts, thereby preventing the passage of fluids and gases. O Ring Seals are widely used in mechanical systems due to their simplicity, effectiveness, and versatility in various applications ¹.

Role of the 3906704 O Ring Seal in Truck Operation

The 3906704 O Ring Seal plays a specific role in the operation of a commercial truck by ensuring the integrity of seals in various systems or components. It is commonly associated with fuel systems, hydraulic systems, and other areas where fluid containment is necessary. The seal helps maintain pressure and prevent leaks, contributing to the overall efficiency and reliability of the truck ².

Key Features of the 3906704 O Ring Seal

The design and material characteristics of the 3906704 O Ring Seal enhance its performance and durability. It is made from high-quality elastomers that provide excellent resistance to wear, compression set, and a range of environmental factors. The seal’s precise dimensions ensure a snug fit within its designated groove, promoting effective sealing ³.

Benefits of Using the 3906704 O Ring Seal

The advantages provided by the 3906704 O Ring Seal include improved sealing efficiency, longevity, and resistance to various environmental factors. Its design allows for consistent performance under different operating conditions, reducing the likelihood of leaks and maintaining system integrity ⁴.

Installation and Maintenance Guidelines

Proper installation of the 3906704 O Ring Seal involves ensuring the groove is clean and free of debris. The seal should be lubricated before insertion to facilitate placement and reduce the risk of damage. Regular maintenance includes inspecting the seal for signs of wear or degradation and replacing it as necessary to ensure continued effectiveness .

Troubleshooting Common Issues

Typical problems associated with O Ring Seals include leaks, extrusion, and degradation. Diagnosing these issues involves checking for visible signs of damage, assessing the seal’s fit within the groove, and evaluating the condition of the surrounding components. Recommended solutions may include replacing the seal or addressing any underlying issues that contribute to seal failure .

Manufacturer Overview - Cummins

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its comprehensive range of products and strong reputation. The company has a history of innovation and commitment to quality, providing reliable components that contribute to the performance and durability of commercial vehicles.

Cummins Engine Part 3906704: O Ring Seal Application

The O Ring Seal part number 3906704, manufactured by Cummins, is a critical component in ensuring the integrity and efficiency of various engine systems. This seal is designed to fit seamlessly within a range of Cummins engines, providing a reliable barrier against leaks and maintaining system pressures. Below is a detailed look at how this O Ring Seal is utilized across different Cummins engine models.

4B3.9 and 6B5.9 Engines

The O Ring Seal 3906704 is integral in the 4B3.9 and 6B5.9 engines, where it is often used in the fuel injection system. This seal ensures that the high-pressure fuel system remains sealed, preventing fuel leaks and maintaining the necessary pressure for optimal engine performance.

B3.9 G, B5.9 G, and B5.9 GAS PLUS CM556 Engines

In the B3.9 G, B5.9 G, and B5.9 GAS PLUS CM556 engines, the O Ring Seal 3906704 is commonly employed in the turbocharger system. Here, it helps to maintain the air pressure within the turbocharger, ensuring efficient operation and preventing air leaks that could compromise engine performance.

G5.9 and G5.9 CM558 Engines

For the G5.9 and G5.9 CM558 engines, this O Ring Seal is utilized in the cooling system. It is essential for maintaining the coolant pressure and preventing leaks, which is crucial for the engine’s thermal management and overall efficiency.

ISC CM850 and ISL9 CM2150 SN Engines

In the ISC CM850 and ISL9 CM2150 SN engines, the O Ring Seal 3906704 is often found in the hydraulic systems. Its role is to ensure that hydraulic pressure is maintained, which is vital for the proper functioning of the engine’s various hydraulically-actuated components.

QSB5.9 CM550 Engines

Lastly, in the QSB5.9 CM550 engines, the O Ring Seal 3906704 is used in the lubrication system. This seal helps to maintain the oil pressure within the engine, ensuring that all moving parts are adequately lubricated and protected from wear and tear.

Each of these applications highlights the versatility and importance of the O Ring Seal 3906704 in maintaining the performance and reliability of Cummins engines.

Role of Part 3906704 O Ring Seal in Engine Systems

The O Ring Seal, part number 3906704, is an essential component in ensuring the integrity and efficiency of various engine systems. Its application spans across multiple critical areas within the engine, contributing to the overall performance and longevity of the engine.

Air Cleaner and Arrangement

In the air cleaner system, the O Ring Seal is utilized to create a secure seal between the air cleaner housing and the intake manifold. This ensures that unfiltered air does not enter the engine, which could lead to increased wear and reduced efficiency.

Oil Fill and Breather Systems

Within the oil fill and breather systems, the O Ring Seal plays a significant role in maintaining the pressure and vacuum levels necessary for proper oil circulation and crankcase ventilation. It seals the connections between the oil filler tube and the crankcase, as well as the breather passages, preventing oil leaks and ensuring that the crankcase breather operates efficiently.

Crankcase and Compressor

The seal is also integral in the crankcase and compressor sections. In the crankcase, it ensures that the lower engine gasket set and gasket full engine set maintain their seals, preventing oil leaks and maintaining the necessary pressure within the crankcase. In the compressor, it seals the connections to the air coupling, ensuring that the compressed air system operates without leaks, which could otherwise lead to a loss of efficiency.

Fuel Pump and Cylinder Block

In the fuel pump system, the O Ring Seal is used to ensure a tight seal around the fuel pump cover and the connections to the cylinder block. This prevents fuel leaks and ensures that the fuel system operates under the correct pressure. Similarly, in the cylinder block, it seals the connections to the front gear and other components, ensuring that the lubricating oil system functions correctly without leaks.

Filter and Lubricating Oil Systems

The O Ring Seal is also crucial in the full flow oil filter and lubricating oil systems. It ensures that the connections between the filter, the cylinder block, and the plumbing are sealed, preventing oil leaks and ensuring that the oil filtration and lubrication processes are efficient.

Lower Engine Gasket Kit and Mounts

In the lower engine gasket kit and mounting systems, the O Ring Seal is used to ensure that the lower engine gasket (LWR ENG GSK) and other components are securely sealed. This is vital for maintaining the structural integrity of the engine and ensuring that all systems operate under the correct conditions.

Conclusion

In summary, the O Ring Seal, part number 3906704, is a versatile component that plays a significant role in sealing various connections within the engine. Its proper installation and maintenance are essential for the efficient operation of the engine systems.