4995634
Rocker Lever
Cummins®

The 4995634 Rocker Lever, manufactured by Cummins, is a critical component in the valve train of internal combustion engines. This article delves into the function, role, key features, benefits, and maintenance of this Cummins part, providing a comprehensive overview for those involved in heavy-duty truck operations and maintenance.

Basic Concepts of Rocker Levers

A rocker lever, or rocker arm, is a pivotal lever in internal combustion engines, responsible for operating the intake and exhaust valves. It translates the motion from the camshaft to the valves, enabling them to open and close at precise intervals. This transfer amplifies the camshaft’s motion, ensuring efficient valve operation and is fundamental to the engine’s performance ¹.

Function and Role in Truck Operation

The 4995634 Rocker Lever is integral to the valve train system, transferring motion from the camshaft to the engine’s valves. This ensures synchronized valve operation with the engine’s cycles, facilitating the intake of air and fuel and the expulsion of exhaust gases. Accurate valve timing is crucial for engine performance and efficiency ².

Key Features

• Constructed from high-strength materials to endure the demands of heavy-duty truck engines.
• Designed for durability and longevity, minimizing the need for frequent replacements.
• Engineered for precise valve actuation, contributing to optimal engine performance.
• Specifically compatible with certain Cummins engine models, ensuring a proper fit and function.

Benefits

• Enhances engine efficiency through accurate valve timing.
• Contributes to overall engine reliability and performance.
• Reduces the likelihood of valve-related issues, promoting smoother engine operation.
• Tailored to meet the demands of heavy-duty truck applications, offering robust performance.

Troubleshooting and Maintenance

Regular inspection of the rocker lever is essential to detect any signs of wear, damage, or improper operation. Proper lubrication of the rocker lever and associated components is crucial to minimize friction and wear. Should issues such as noisy valve operation or decreased engine performance arise, further diagnosis and potential replacement may be necessary.

Compatibility of Rocker Lever Part 4995634 with Cummins Engines

This part is designed to fit various Cummins engine models, playing a vital role in the engine’s valve train system. Ensuring proper valve operation and overall engine performance, it is compatible with:

• ISC Series Engines: ISC CM2150, ISC8.3 CM2250
• ISL Series Engines: ISL CM2150, ISL9 CM2150 SN, ISL9 CM2250, ISL9.5 CM2880 L138
• QSC/QSL Series Engines: QSC9 CM2250/QSL9 CM2250, QSL8.9 CM2150 L141, QSL9 CM2250, QSL9 CM2350 L102, QSL9 CM850 (CM2850)

Correct installation of the 4995634 Rocker Lever is essential for maintaining engine performance and longevity across these models.

Rocker Lever Component Usage

The 4995634 Rocker Lever is a fundamental component in the operation of various engine systems. It works in conjunction with other parts to ensure efficient and reliable engine performance. Within the rocker lever assembly, this part is responsible for transferring motion from the camshaft to the valves, amplifying this motion for precise valve operation. Its design ensures consistent valve operation across varying engine speeds and loads, maintaining engine efficiency and power output. Additionally, the rocker lever’s design incorporates features that reduce friction and wear, contributing to the longevity of the valve train components. The ease of maintenance and replacement afforded by its integration within the rocker lever assembly is particularly beneficial in high-performance engines.

Conclusion

The 4995634 Rocker Lever is an indispensable element in the valve train system, ensuring smooth and efficient valve operation in response to the camshaft’s commands. Its role in the rocker lever assembly is crucial for the overall functionality and reliability of the engine, making it a key component in the maintenance and performance of Cummins engines.