4936080
Valve Spring
Cummins®

The Cummins 4936080 Valve Spring is a component designed for use in commercial truck engines. Its purpose is to ensure the proper operation of the valve train, which is integral to the engine’s performance. This valve spring is significant in maintaining the efficiency and reliability of truck engines under various operating conditions.

Basic Concepts of Valve Springs

Valve springs are mechanical components found in internal combustion engines. Their primary function is to keep the valves in contact with their seats when the engine is not in the valve opening phase. This ensures that the valves close properly after being opened by the camshaft, thus maintaining the correct valve timing and contributing to the overall engine performance. Valve springs operate by compressing during the valve opening event and then expanding to close the valve, a cycle that repeats with each engine cycle ¹.

Purpose of the Cummins 4936080 Valve Spring

This Cummins part plays a role in the operation of a truck engine by maintaining valve seat pressure. This ensures that the valves seal properly against their seats, which is crucial for efficient combustion and engine performance. By providing consistent pressure, the valve spring helps to prevent valve float at high engine speeds, which can lead to engine damage ².

Key Features

The 4936080 is characterized by its robust design and the materials used in its construction. It is made from high-quality spring steel, which offers excellent resistance to fatigue and corrosion. The spring’s design includes multiple coils that provide the necessary tension to keep the valves seated under various engine operating conditions. Additionally, the spring’s ends are designed to interface securely with the valve keeper and seat, ensuring reliable operation.

Benefits

Using this Valve Spring is associated with several benefits. It contributes to improved engine efficiency by ensuring that the valves operate within the designed parameters. The spring’s durable construction allows for reliable performance under heavy-duty conditions, which is typical for commercial truck operations. Its design also helps to reduce the likelihood of valve-related issues, leading to lower maintenance costs over time ³.

Installation Considerations

When installing this part, it is important to follow guidelines and best practices to ensure proper fitting and function. This includes verifying that the spring is the correct size and type for the specific engine application. Careful attention should be paid to the orientation of the spring and the installation of the valve keeper to prevent issues such as valve train noise or performance problems.

Troubleshooting and Maintenance

Common issues related to valve springs, such as valve train noise or performance problems, can often be traced back to improper installation or wear. Regular maintenance, including inspection for signs of wear or damage, can help to prolong the life of the 4936080. If issues are detected, it is advisable to replace the spring to prevent further engine damage.

Performance Under Heavy-Duty Conditions

This Valve Spring is designed to perform under the demanding conditions typical of commercial truck operations. It is capable of withstanding high loads and extended use without significant degradation in performance. This makes it suitable for engines that operate under heavy-duty conditions, where reliability and durability are paramount.

Compatibility and Applications

The 4936080 is compatible with a range of truck models and engine types. Its versatility and widespread use in the industry make it a popular choice for both original equipment manufacturers and aftermarket applications.

Manufacturer Overview - Cummins

Cummins Inc. is a well-established company with a strong reputation in the industry for producing high-quality automotive components. With a history of innovation and a commitment to excellence, Cummins has become a trusted name in the production of engine parts, including valve springs. The company’s dedication to quality and performance is evident in the 4936080, which is designed to meet the rigorous demands of commercial truck engines.

Cummins Engine Compatibility with Valve Spring Part 4936080

The Cummins Valve Spring part number 4936080 is a critical component designed to fit a variety of Cummins engines. This part is engineered to ensure reliable and efficient engine operation by maintaining the proper tension and function of the engine’s valves. Below is a detailed breakdown of the engines that are compatible with this valve spring:

B Series Engines

• B4.5 CM2350 B129B
• B4.5 RGT
• B5.6 CM2670 B152B
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125

F Series Engines

• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F3.8 F102
• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

ISB Series Engines

• ISB (Chrysler)
• ISB CM2150
• ISB CM550
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB4.5 CM2350 B104
• ISB5.9 CM2880 B110
• ISB5.9 CM2880 B140
• ISB5.9 CM2880 B149

The compatibility of the Cummins Valve Spring part number 4936080 across these engines underscores its versatility and importance in maintaining the integrity and performance of various Cummins engine models. This part is essential for ensuring that the engine’s valves operate smoothly and efficiently, contributing to the overall reliability and longevity of the engine.

Role of Part 4936080 Valve Spring in Engine Systems

The part 4936080 valve spring is an integral component in the operation of various engine systems. It ensures the proper functioning of the valve train by maintaining consistent valve seating and sealing. Here’s how it interacts with different engine components:

Camshaft

The valve spring works in conjunction with the camshaft to control the opening and closing of the valves. As the camshaft lobes push the valves open, the valve spring provides the necessary tension to ensure the valves return to their closed position promptly and securely.

Connecting Rod and Piston

While the connecting rod and piston are primarily responsible for converting the linear motion of the piston into rotational motion of the crankshaft, the efficient operation of these components relies on precise valve timing. The valve spring ensures that the intake and exhaust valves open and close at the correct moments, optimizing the air-fuel mixture intake and exhaust gas expulsion.

Cylinder 6B Head and Cylinder Head

In the cylinder 6B head and other cylinder heads, the valve spring plays a vital role in maintaining valve integrity. It counters the centrifugal forces that act on the valves at high engine speeds, preventing valve float and ensuring that the valves remain seated against the cylinder head.

Head and Cylinder

The interaction between the head and cylinder is facilitated by the valve spring. It ensures that the valves seal properly against the cylinder head, preventing leaks and maintaining compression within the cylinder. This sealing is essential for efficient combustion and overall engine performance.

Injector and Injector Plumbing

For engines equipped with fuel injectors, the timing and duration of fuel delivery are closely tied to valve operation. The valve spring ensures that the intake valves open and close in sync with the injector’s fuel delivery, optimizing the air-fuel mixture for combustion.

Long Block and Long Block Kit

In a long block or long block kit, which includes the engine block, crankshaft, pistons, connecting rods, and cylinder heads, the valve spring is a key component. It ensures that the valves within the cylinder heads operate correctly, contributing to the overall reliability and performance of the long block assembly.

Parts and Performance

When considering engine performance parts, the valve spring is often upgraded to handle higher RPMs and increased valvetrain stress. A high-performance valve spring can enhance engine efficiency, power output, and durability by ensuring that the valves operate smoothly under demanding conditions.

Conclusion

The Cummins 4936080 Valve Spring is a critical component in the operation of commercial truck engines. Its robust design, durable construction, and precise function ensure that the valves operate efficiently, contributing to the overall performance and reliability of the engine. Proper installation, regular maintenance, and understanding its role within the engine system are essential for maximizing the benefits of this part.