3928404
Valve Cover
Cummins®

The Cummins 3928404 Valve Cover is a component designed for heavy-duty trucks, playing a significant role in the engine’s operation. This valve cover is engineered to provide protection for the engine’s internal components while also contributing to the management of emissions. Understanding its purpose and functionality is key to maintaining the efficiency and reliability of heavy-duty trucks.

Basic Concepts of Valve Covers

A valve cover is a part of the engine system that encloses the camshaft, valve train components, and other top-end parts of the engine. Its primary functions include protecting these components from external contaminants, containing engine oil within the system, and reducing noise from the valve train. The valve cover also plays a role in managing emissions by ensuring that any gases released from the engine are directed through the proper channels ¹.

Purpose of the Cummins 3928404 Valve Cover

The Cummins 3928404 Valve Cover serves multiple functions in the operation of a truck. It protects the engine’s internal components from dirt, debris, and other contaminants that could lead to wear or damage. Additionally, it helps in managing emissions by ensuring that any gases released from the engine are properly directed and controlled. This valve cover is designed to integrate seamlessly with the engine system, contributing to the overall efficiency and performance of the truck ².

Key Features

The Cummins 3928404 Valve Cover is constructed from durable materials, ensuring longevity and resistance to the harsh conditions encountered by heavy-duty trucks. Its design includes features that enhance its performance and durability, such as precise fitting to ensure a secure seal and robust construction to withstand high pressures and temperatures. These attributes contribute to the valve cover’s ability to protect the engine and maintain its efficiency over time ³.

Benefits

The use of the Cummins 3928404 Valve Cover offers several benefits. It provides enhanced protection for the engine’s internal components, contributing to the longevity and reliability of the engine. Additionally, by effectively managing emissions, it helps in maintaining the truck’s compliance with environmental regulations. Over time, the durability and efficiency of this valve cover can lead to potential cost savings by reducing the need for frequent replacements or repairs.

Installation Process

Installing the Cummins 3928404 Valve Cover requires careful attention to detail to ensure a secure fit. The process involves removing the old valve cover, cleaning the surface to ensure no debris interferes with the seal, and then positioning the new valve cover. Tools such as wrenches and gasket sealant may be required. It’s important to follow the manufacturer’s guidelines for torque specifications to ensure the valve cover is properly secured without over-tightening, which could lead to damage.

Maintenance and Troubleshooting

Routine maintenance of the Cummins 3928404 Valve Cover includes checking for any signs of wear or damage, ensuring the gasket is intact and providing a proper seal, and inspecting for any leaks. Common issues may include gasket failure leading to oil leaks or contamination entering the engine. Troubleshooting these problems effectively involves identifying the source of the issue, whether it’s a faulty gasket or damage to the valve cover itself, and taking the appropriate steps to address it, which may include replacement or repair.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a reputation for quality and innovation in the automotive industry, particularly in the realm of heavy-duty truck components. Their product range includes a variety of engine types and components, all designed to meet the demanding requirements of heavy-duty applications.

Cummins Valve Cover 3928404 Compatibility

The Cummins Valve Cover part number 3928404 is designed to fit a variety of Cummins engines, ensuring a secure seal and efficient engine operation. This valve cover is engineered to meet the specific requirements of several engine models, providing a reliable solution for engine maintenance and repair.

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 Cummins Valve Cover 3928404 is compatible with a broad range of engine models, which can be grouped based on their specifications and applications:

• 3.9 Liter Engines:

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

• 5.9 Liter Engines:

  • 6B5.9
  • B5.9 CM2670 B166C
  • B5.9 G
  • B5.9 GAS PLUS CM556
  • G5.9
  • G5.9 CM558
  • ISB5.9 CM2880 B127
  • ISB5.9G CM2180
  • QSB5.9 30 CM550
  • QSB5.9 CM2880 B139
  • QSB5.9 CM550
  • QSB5.9G

• 4.5 Liter Engine:

  • B4.5

• 6.7 Liter Engine:

  • B6.7S

This comprehensive compatibility ensures that the valve cover can be used across a wide range of Cummins engines, providing a versatile solution for engine maintenance and repair needs.

Understanding the Role of Part 3928404 Valve Cover in Engine Systems

The part 3928404 Valve Cover is an essential component in the arrangement of an engine’s valve system. Its primary function is to enclose and protect the valve mechanism, ensuring the integrity and efficiency of the engine’s operation.

In the valve cover arrangement, the 3928404 Valve Cover fits snugly over the valve assembly, providing a sealed environment that prevents oil leaks and contaminants from entering the valve system. This seal is vital for maintaining the lubrication of moving parts and ensuring smooth operation.

The cover also plays a role in managing the Positive Crankcase Ventilation (PCV) system. By integrating PCV components within its design, the valve cover helps in redirecting crankcase gases back into the intake system, thus reducing emissions and improving engine efficiency.

Furthermore, the 3928404 Valve Cover often includes passages for oil circulation, which are crucial for distributing lubricant to various parts of the valve train. This ensures that components such as camshafts, rocker arms, and lifters receive consistent lubrication, prolonging their lifespan and enhancing performance.

In summary, the 3928404 Valve Cover is a multifaceted component that not only protects the valve system but also contributes to the overall efficiency and reliability of the engine. Its integration within the valve cover arrangement is designed to optimize engine performance while safeguarding internal components from wear and contamination.

Conclusion

The Cummins 3928404 Valve Cover is a critical component for heavy-duty trucks, offering protection, efficiency, and compliance with environmental regulations. Its durable construction, precise fitting, and role in emissions management make it a valuable part of the engine system. Proper installation, maintenance, and understanding of its functions are essential for maximizing the performance and longevity of the engine.