3904087
Oil Seal
Cummins®

The Cummins 3904087 Oil Seal is a component designed to ensure the efficient operation of commercial trucks. Its role is to maintain the integrity of the lubrication system by preventing lubricant leakage. This seal is integral to the smooth functioning of truck engines, contributing to their reliability and performance.

Basic Concepts of Oil Seals

An oil seal, also known as a rotary shaft seal, is designed to prevent the leakage of lubricants from rotating shafts. It functions by creating a barrier between the rotating component and the stationary parts of the system. This barrier is crucial for maintaining the lubrication necessary for reducing friction and wear on moving parts. The integrity of the oil seal directly impacts the efficiency and longevity of the machinery it serves ¹.

Purpose of the Cummins 3904087 Oil Seal

The Cummins 3904087 Oil Seal plays a role in the operation of a truck by sealing rotating shafts and preventing lubricant loss. This seal ensures that the lubricant remains within the system, providing consistent lubrication to critical components. By maintaining proper lubrication, the seal helps in reducing wear and tear on the shaft and other moving parts, thereby contributing to the overall efficiency and reliability of the truck’s engine.

Key Features

The Cummins 3904087 Oil Seal is characterized by its material composition and design elements that enhance its performance. Typically made from durable materials such as rubber or synthetic compounds, this seal is designed to withstand the high temperatures and pressures encountered in commercial truck engines. Its design includes features like a spring-energized lip that maintains contact with the shaft, ensuring a tight seal even under dynamic conditions.

Benefits of Using the Cummins 3904087 Oil Seal

Utilizing the Cummins 3904087 Oil Seal offers several advantages. Its durable construction contributes to a longer service life, reducing the frequency of replacements. The seal’s design enhances sealing efficiency, ensuring that lubricants remain within the system. This contributes to overall system reliability by maintaining optimal lubrication conditions, which are vital for the efficient operation of truck engines.

Installation Considerations

Proper installation of the Cummins 3904087 Oil Seal is vital for ensuring optimal performance and longevity. Guidelines for installation include ensuring the mating surfaces are clean and free of debris, using the correct tools to install the seal without damaging it, and verifying that the seal is properly seated. Following these best practices helps in achieving a secure fit that maximizes the seal’s effectiveness.

Maintenance and Troubleshooting

Routine maintenance practices for the Cummins 3904087 Oil Seal include regular inspections for signs of wear or damage. Troubleshooting common issues may involve checking for proper installation, ensuring the seal is not exposed to excessive heat or pressure, and verifying that the lubrication system is functioning correctly. Addressing these factors can help in maintaining the seal’s performance and extending its service life ².

Manufacturer Overview - Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history of innovation and a commitment to quality, Cummins has established a reputation for producing reliable and high-performance automotive components. Their dedication to excellence is reflected in the design and manufacturing of components like the Cummins 3904087 Oil Seal.

Cummins Oil Seal 3904087 Compatibility

The Cummins Oil Seal part number 3904087 is designed to fit a variety of Cummins engines, ensuring a reliable seal to prevent oil leaks. Here is a detailed breakdown of the engines that this oil seal is compatible with:

4B3.9 and 6B5.9 Engines

The oil seal 3904087 is suitable for use in the 4B3.9 and 6B5.9 engines. These engines are part of the earlier Cummins lineup and are known for their robust construction and durability.

6C8.3 and C8.3 G Engines

The oil seal is also compatible with the 6C8.3 and C8.3 G engines. These engines are part of the Cummins C-Series and are often used in medium-duty applications.

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

The oil seal fits the B3.9 G, B5.9 G, and B5.9 GAS PLUS CM556 engines. These engines are part of the B-Series and are designed for various applications, including agricultural and industrial uses.

C GAS PLUS CM556 and C8.3 G Engines

The oil seal is also compatible with the C GAS PLUS CM556 and C8.3 G engines. These engines are part of the C-Series and are known for their versatility and performance.

G5.9, G5.9 CM558, and G8.3 Engines

The oil seal 3904087 fits the G5.9, G5.9 CM558, and G8.3 engines. These engines are part of the G-Series and are widely used in various applications, including construction and transportation.

G8.3 CM558 and GTA8.3 CM558 Engines

The oil seal is also compatible with the G8.3 CM558 and GTA8.3 CM558 engines. These engines are part of the G-Series and are known for their high performance and reliability.

ISB CM550, ISB5.9G CM2180, and ISC CM2150 Engines

The oil seal fits the ISB CM550, ISB5.9G CM2180, and ISC CM2150 engines. These engines are part of the ISB and ISC families and are used in a variety of applications, including heavy-duty trucks and industrial equipment.

ISC CM554, ISC CM850, and ISC8.3 CM2250 Engines

The oil seal is also compatible with the ISC CM554, ISC CM850, and ISC8.3 CM2250 engines. These engines are part of the ISC family and are known for their efficiency and power.

ISL CM2150, ISL CM554, and ISL G CM2180 Engines

The oil seal fits the ISL CM2150, ISL CM554, and ISL G CM2180 engines. These engines are part of the ISL family and are used in various applications, including medium-duty trucks and industrial equipment.

ISL9 CM2150 SN, ISL9 CM2250, and ISL9.5 CM2880 L138 Engines

The oil seal is also compatible with the ISL9 CM2150 SN, ISL9 CM2250, and ISL9.5 CM2880 L138 engines. These engines are part of the ISL family and are known for their performance and reliability.

Role of Part 3904087 Oil Seal in Engine Systems

The 3904087 Oil Seal is an essential component in maintaining the integrity and efficiency of various engine systems. Its primary function is to prevent oil leakage while allowing smooth operation of moving parts. Here’s how it integrates with different engine components:

• Coupling: The oil seal ensures that the coupling remains lubricated without oil escaping, which is vital for the smooth transfer of power between connected components.

• Fuel Pump: Although the fuel pump itself doesn’t directly interact with the oil seal, maintaining proper oil levels and preventing leaks ensures the overall engine environment remains clean and efficient, indirectly supporting the fuel pump’s performance.

• Cover: The oil seal works in conjunction with the cover to create a sealed environment, protecting internal components from contaminants and ensuring oil stays within the system.

• Front Gear: Located in the front gear area, the oil seal prevents oil from leaking out while the gear rotates, ensuring consistent lubrication and reducing wear.

• Cylinder Head: While the cylinder head deals primarily with combustion, a well-sealed oil system ensures that oil pressure remains stable, indirectly supporting the head’s gaskets and seals.

• Flywheel Housing: The oil seal in the flywheel housing area prevents oil leaks, maintaining the housing’s integrity and ensuring the flywheel operates smoothly.

• Housing: General housing components benefit from the oil seal by maintaining a clean and lubricated environment, which is essential for the longevity of these parts.

• Flywheel: The flywheel relies on consistent lubrication to operate efficiently. The oil seal ensures that oil is retained within the system, supporting the flywheel’s smooth rotation.

• Long Block: In a long block assembly, the oil seal plays a significant role in maintaining oil integrity throughout the engine, supporting the crankshaft, connecting rods, and other moving parts.

• Lower Engine Gasket Kit / Set: These gaskets work in tandem with the oil seal to create a comprehensive sealing solution, ensuring no oil escapes from the lower part of the engine.

• Overhaul Kit: An overhaul kit often includes various seals and gaskets. The 3904087 Oil Seal is a key component in such kits, ensuring that the engine is thoroughly sealed during a major rebuild.

• Rear Cover: The oil seal interacts with the rear cover to prevent oil leakage from the backside of the engine, maintaining a sealed environment.

• Rear Crank Seal Service Kit / Rebuild Kit: These kits often include the 3904087 Oil Seal to ensure the crankshaft area remains well-lubricated and leak-free during rebuilds or maintenance.

• Seal Service Kit Rear: Specifically designed for the rear section of the engine, this kit includes the oil seal to ensure comprehensive sealing solutions.

• Set Engine Gasket: A complete set of engine gaskets will often include the 3904087 Oil Seal to ensure all critical areas are sealed, maintaining engine efficiency and longevity.

• Short Block: In a short block assembly, the oil seal is vital for maintaining oil integrity around the crankshaft and other lower engine components, ensuring smooth operation and longevity.

Conclusion

The Cummins 3904087 Oil Seal is a critical component in the maintenance and efficiency of commercial truck engines. Its role in preventing lubricant leakage ensures consistent lubrication, reducing wear and tear on moving parts, and contributing to the overall reliability of the engine. Proper installation, regular maintenance, and understanding its compatibility with various Cummins engines are essential for maximizing the performance and longevity of this part.

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