3930906
Valve Cover Gasket
Cummins®

The Valve Cover Gasket 3930906, manufactured by Cummins, is a critical component designed to seal the valve cover to the cylinder head of an engine. Its primary function is to prevent oil leaks and maintain the integrity of the engine’s lubrication system. This gasket is essential for the efficient and reliable operation of heavy-duty trucks ¹.

Basic Concepts of Valve Cover Gaskets

Valve cover gaskets are engineered to create a seal between the valve cover and the cylinder head. Typically made from materials such as rubber, cork, or a composite of both, these gaskets are chosen for their ability to withstand high temperatures and pressures. The primary function of a valve cover gasket is to prevent oil from leaking out of the valve cover, which houses the camshaft and valve train components ².

Function and Role of Valve Cover Gasket 3930906

The Valve Cover Gasket 3930906 ensures a tight seal between the valve cover and the cylinder head, which is vital for maintaining the engine’s lubrication system integrity. This seal prevents oil leaks that could lead to engine damage or decreased performance. By keeping the valve cover securely sealed, the gasket helps maintain the engine’s overall efficiency and longevity.

Key Features of Valve Cover Gasket 3930906

This Cummins part is designed with specific features to enhance its performance and durability. It is constructed from high-quality materials that can withstand the extreme conditions within an engine. The gasket’s design ensures a precise fit, providing a reliable seal that resists oil leaks. Additionally, it is engineered to accommodate the thermal expansion and contraction that occur during engine operation, maintaining its sealing properties over time.

Benefits of Using Valve Cover Gasket 3930906

Using the Valve Cover Gasket 3930906 offers several benefits. It contributes to improved engine performance by ensuring a secure seal that prevents oil leaks. This gasket’s durable construction enhances the engine’s reliability, reducing the risk of unexpected failures. Furthermore, its reliable sealing properties help maintain the engine’s lubrication system, promoting efficient operation and extending the engine’s lifespan.

Troubleshooting and Maintenance

To ensure the longevity and optimal performance of the Valve Cover Gasket 3930906, regular maintenance is recommended. Inspecting the gasket for signs of wear or damage during routine engine checks can help identify potential issues before they lead to more significant problems. If an oil leak is detected, it may indicate a faulty gasket that requires replacement. Following the manufacturer’s guidelines for maintenance and replacement can help maintain the engine’s efficiency and reliability.

About 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 quality, Cummins has established a strong reputation in the automotive industry, particularly for its heavy-duty truck components. The company’s commitment to excellence is reflected in its wide range of products, which are designed to meet the demanding requirements of various applications.

Valve Cover Gasket 3930906 Compatibility with Cummins Engines

The Valve Cover Gasket part number 3930906, manufactured by Cummins, is designed to fit a variety of Cummins engines. This gasket ensures a proper seal between the valve cover and the engine block, preventing oil leaks and maintaining engine efficiency. Below is a detailed breakdown of the engines with which this gasket is compatible:

3.9 Liter Engines

• 4B3.9
• B3.9 G
• ISB3.9 CM2220 B107
• QSB3.9 30 CM550
• QSB3.9 CM2880 B138

5.9 Liter Engines

• 6B5.9
• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556
• ISB5.9 CM2880 B127
• ISB5.9G CM2180
• QSB5.9 30 CM550
• QSB5.9 CM2880 B139
• QSB5.9 CM550
• QSB5.9G

6.7 Liter Engines

• B6.7S
• G5.9
• G5.9 CM558

This gasket is engineered to provide a reliable seal for these engines, ensuring optimal performance and longevity.

Role of Valve Cover Gasket 3930906 in Engine Systems

The Valve Cover Gasket 3930906 is an essential component in ensuring the integrity and efficiency of various engine systems. It is specifically designed to seal the valve cover to the cylinder head, preventing oil leaks and maintaining proper pressure within the engine.

Integration with Engine Components

1. Valve Cover and Cylinder Head: The primary function of the Valve Cover Gasket is to create a secure seal between the valve cover and the cylinder head. This seal is vital for retaining engine oil within the crankcase and preventing it from leaking out, which could lead to oil starvation and engine damage.

2. Breather Kit: In conjunction with the breather kit, the Valve Cover Gasket helps manage crankcase ventilation. It allows gases to escape while keeping oil contained, which is important for maintaining clean air intake and efficient engine operation.

3. Upper Engine Gasket Set: When used as part of an upper engine gasket set, the Valve Cover Gasket contributes to the overall sealing strategy of the engine’s upper components. This set typically includes gaskets for the intake manifold, exhaust manifold, and other upper engine parts, all working together to ensure a leak-free environment.

4. Engine Repair Kit and Overhaul Kit: During engine repairs or overhauls, the Valve Cover Gasket is often replaced to ensure a fresh, reliable seal. It is a standard component in engine repair kits and overhaul kits, highlighting its importance in maintaining engine health post-repair.

5. Pistonless Overhaul and Cylinder Head Repair Kit: In scenarios where a pistonless overhaul or cylinder head repair is performed, the Valve Cover Gasket plays a role in reassembling the engine correctly. It ensures that all upper components are sealed properly, allowing for optimal engine performance after repairs.

6. Marine Spare Parts Kit and Marine Spares Kit: For marine engines, the Valve Cover Gasket is included in spare parts kits to address the unique challenges of marine environments. It helps in maintaining the engine’s reliability and performance in harsh, corrosive conditions.

7. Engine Installation Kit: During the installation of a new or rebuilt engine, the Valve Cover Gasket is a critical component in the engine installation kit. It ensures that the valve cover is properly sealed upon initial startup, preventing oil leaks and ensuring the engine operates within specified parameters.

8. UPR Eng GSK (TAL) and Valve Cover Kit: In specialized valve cover kits, the Valve Cover Gasket is often paired with other components like the UPR Eng GSK (TAL) to provide a comprehensive sealing solution. This ensures that all aspects of the valve cover system are addressed, from sealing to ventilation.

Conclusion

In summary, the Valve Cover Gasket 3930906 is a fundamental component in various engine systems, ensuring proper sealing, ventilation, and overall engine efficiency. Its role extends across multiple repair, overhaul, and installation scenarios, making it a key element in maintaining engine performance and longevity.