3906412
Valve Spring
Cummins®

Introduction

The Cummins 3906412 Valve Spring is a critical component in commercial truck engines, designed to ensure the proper operation of valves. It maintains precise timing and sealing of the valves, which are essential for engine performance and efficiency. This spring is engineered to withstand the demanding conditions of heavy-duty truck engines, ensuring reliable operation under various load and speed conditions ².

Basic Concepts of Valve Springs

Valve springs are coiled springs positioned above the valves in an engine. Their primary function is to keep the valves closed when not actuated by the camshaft, ensuring they open and close at the correct times. This allows for the proper intake of air and fuel and the expulsion of exhaust gases. The effectiveness of valve springs directly influences engine performance and efficiency, as they contribute to maintaining correct valve timing and sealing ³.

Role of the 3906412 Valve Spring in Truck Operation

The 3906412 Valve Spring ensures that valves return to their closed position after being opened by the camshaft. It interacts with other engine components such as the valve keeper, valve stem, and valve lifter to maintain the integrity of the valve train. Its design allows it to handle the high stresses and temperatures encountered in heavy-duty applications, ensuring consistent valve operation ².

Key Features of the 3906412 Valve Spring

This part is characterized by its robust design and construction, which include high-quality materials and precise manufacturing processes. These features enhance its performance and durability, allowing it to withstand the rigors of heavy-duty truck engines. The spring’s design also incorporates features that reduce the risk of valve float at high engine speeds, contributing to improved engine performance ¹.

Benefits of Using the 3906412 Valve Spring

Utilizing this Cummins part in a truck engine offers several advantages. These include improved engine efficiency due to precise valve timing, enhanced reliability under demanding conditions, and increased longevity of the valve train components. The spring’s design ensures that the valves operate within their intended parameters, even under extreme conditions ².

Installation and Maintenance

Proper installation of the 3906412 Valve Spring is crucial for its effective operation. This involves using the recommended procedures and tools to ensure that the spring is correctly positioned and secured. Regular maintenance, including inspection for signs of wear or damage, is also important to ensure that the spring remains in optimal condition. This may involve periodic checks during routine engine maintenance or when performing valve train adjustments ¹.

Troubleshooting Common Issues

Common problems associated with valve springs, such as failure or wear, can lead to engine performance issues. Troubleshooting these problems may involve inspecting the spring for signs of deformation or breakage, checking the valve train components for wear, and ensuring that the spring is correctly installed. Addressing these issues promptly can help maintain engine performance and prevent more serious problems ³.

Performance Enhancements

The 3906412 Valve Spring can contribute to performance enhancements in a truck engine by ensuring precise valve operation. This can lead to potential improvements in power output and fuel efficiency, as the engine operates more efficiently with properly timed and sealed valves. The spring’s design is optimized to support these performance enhancements under a wide range of operating conditions ².

Compatibility and Applications

The 3906412 Valve Spring is commonly used in a variety of engines and truck models, highlighting its versatility and widespread application in the industry. Its design and performance characteristics make it suitable for use in engines that require reliable valve operation under demanding conditions ².

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emission solutions. With a strong reputation in the industry, Cummins is committed to producing high-quality automotive components that meet the needs of its customers. The company’s history of innovation and excellence in engineering is reflected in its products, including the 3906412 Valve Spring ².

Valve Spring 3906412 Compatibility with Cummins Engines

The Cummins Valve Spring part number 3906412 is designed to fit a variety of Cummins engines, ensuring reliable performance and durability. This valve spring is engineered to meet the specific requirements of several engine models, providing a critical function in the engine’s operation.

Compatible Engines

• 6C8.3
• C GAS PLUS CM556
• C8.3 G
• G8.3
• G8.3 CM558
• GTA8.3 CM558
• ISL G CM2180
• L GAS PLUS CM556
• L9.3 L105

These engines, while differing in their specific configurations and applications, share a commonality in their need for high-performance valve springs. The 3906412 part number is meticulously crafted to ensure it fits seamlessly within these engines, maintaining the integrity of the engine’s valve train system.

Grouping of Compatible Engines

The engines listed can be grouped based on their series and common characteristics:

• 6C8.3, C8.3 G, G8.3, G8.3 CM558, GTA8.3 CM558

  • These engines are part of the G series, known for their robust design and efficiency. The valve spring 3906412 is tailored to handle the specific stresses and operational demands of these engines.

• C GAS PLUS CM556, L GAS PLUS CM556

  • Both engines in this group are equipped with gas-powered technology and share similar valve train configurations. The 3906412 valve spring is designed to fit these engines, ensuring optimal performance and longevity.

• ISL G CM2180, L9.3 L105

  • These engines represent a more advanced segment of Cummins’ lineup, with the ISL G CM2180 being a high-performance diesel engine and the L9.3 L105 being a gas-powered engine. The 3906412 valve spring is engineered to meet the stringent requirements of these engines, providing reliable performance under demanding conditions.

The Cummins Valve Spring part number 3906412 is a critical component for maintaining the efficiency and reliability of these engines. Its compatibility across various engine models underscores its versatility and importance in the engine’s overall performance ².

Role of Part 3906412 Valve Spring in Engine Systems

The part 3906412 Valve Spring is integral to the operation of several key engine components. It ensures the proper functioning of the camshaft by maintaining the necessary pressure between the camshaft lobes and the valve stems. This consistent pressure is essential for the precise opening and closing of the valves in synchronization with the camshaft’s rotation.

In the cylinder head, the valve spring plays a significant role in managing valve train dynamics. It helps in controlling the valve’s motion, ensuring that the intake and exhaust valves open and close at the correct times and with the appropriate force. This is particularly important in high-performance engines where valve speeds are increased.

When considering a cylinder head kit or a head cylinder replacement, the valve spring’s quality and specifications are vital. The spring must be able to handle the increased stress and higher RPMs that often accompany performance upgrades.

In conjunction with the injector, the valve spring contributes to efficient fuel delivery by ensuring that the intake valves open and close properly, allowing for optimal air-fuel mixture intake.

For performance parts, the valve spring’s design and material are often upgraded to withstand the higher stresses and temperatures generated by enhanced engine performance. This ensures that the valve train remains reliable under demanding conditions.

In a short engine kit, where compactness and efficiency are paramount, the valve spring must be precisely engineered to fit within the limited space while still providing the necessary performance. This requires a balance between spring rate, wire diameter, and overall spring design to meet the kit’s performance goals without compromising reliability ³.

Conclusion

The Cummins 3906412 Valve Spring is a vital component in ensuring the efficient and reliable operation of commercial truck engines. Its robust design, precise manufacturing, and compatibility with a wide range of Cummins engines make it an essential part for maintaining engine performance and efficiency. Proper installation, regular maintenance, and prompt troubleshooting of common issues are crucial for maximizing the benefits of this part.