3966658
Rocker Lever Shaft
Cummins®

Introduction

The Rocker Lever Shaft, identified by Cummins Part #3966658, is a critical component in the engine’s valve train mechanism. Manufactured by Cummins, a reputable name in the automotive industry, this part is designed to enhance the functionality and efficiency of truck engines. Its role in the valve train system is significant, contributing to the overall performance and reliability of the engine.

Basic Concepts and Functionality

The Rocker Lever Shaft operates within the valve train system, working in conjunction with other components such as camshafts and valves. Its primary function is to transfer motion from the camshaft to the valves, ensuring that the valves open and close at the precise moments required for optimal engine operation. This transfer of motion is essential for maintaining the engine’s efficiency and performance, as it directly influences the timing and duration of the valve events ¹.

Purpose of the Rocker Lever Shaft

In the operation of a truck engine, the Rocker Lever Shaft serves a vital role. It is responsible for transferring the rotational motion of the camshaft into the linear motion needed to operate the valves. This conversion of motion is fundamental to the engine’s ability to intake air and expel exhaust gases efficiently. By ensuring precise valve timing, the Rocker Lever Shaft contributes to the engine’s overall performance, fuel efficiency, and power output ².

Key Features

The Cummins Rocker Lever Shaft is characterized by its durable construction and precise engineering. It is designed to withstand the demanding conditions of truck engines, ensuring long-term reliability and performance. The shaft is compatible with specific engine models, reflecting Cummins’ commitment to producing components that meet the exact requirements of their engines. Unique design elements and materials used in its manufacture further enhance its durability and efficiency.

Benefits

The Cummins Rocker Lever Shaft offers several benefits that contribute to improved engine efficiency and performance. Its durable construction ensures reliable operation under demanding conditions, while its precise engineering enhances the engine’s overall efficiency. These benefits not only improve the engine’s performance but also contribute to its longevity, making the Rocker Lever Shaft a valuable component in the valve train system.

Troubleshooting and Maintenance

Common issues that may arise with the Rocker Lever Shaft include wear, noise, or malfunction. Regular inspection and maintenance are recommended to ensure optimal performance and longevity of the component. This includes checking for signs of wear, ensuring proper lubrication, and adhering to recommended replacement intervals. Addressing these issues promptly can prevent more significant problems and ensure the engine operates efficiently ³.

Cummins Overview

Cummins Inc. is a well-established manufacturer in the automotive industry, known for its high-quality engine components. With a history of innovation and excellence, Cummins has built a reputation for producing reliable and durable parts for commercial trucks. Their expertise in designing and manufacturing engine components is evident in the quality and performance of parts like the Rocker Lever Shaft, underscoring their commitment to enhancing the efficiency and reliability of truck engines.

Compatibility of Rocker Lever Shaft Part 3966658 with Cummins Engines

The Rocker Lever Shaft part number 3966658, manufactured by Cummins, is designed to fit a variety of Cummins engines. This part is integral in the operation of the engine’s valve train, ensuring smooth and reliable performance. Here is a detailed look at the compatibility of this part with different Cummins engines:

ISC Series Engines

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

ISL Series Engines

• ISL CM2150
• ISL CM554
• ISL G CM2180
• ISL9 CM2150 SN
• ISL9 CM2250
• ISL9.5 CM2880 L138

L Series Engines

• L GAS PLUS CM556
• L8.9
• L8.9 CM2670 L134C
• L8.9 L121
• L8.9G CMOH2.0 L125B
• L9 CM2670 L128B
• L9.5 L117

QSC Series Engines

• QSC8.3 CM2880 C102
• QSC8.3 CM554
• QSC8.3 CM850(CM2850)

G Series Engines

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

By ensuring that the Rocker Lever Shaft part 3966658 is correctly installed in these engines, users can maintain optimal performance and reliability. This compatibility across various Cummins engine models highlights the versatility and importance of this component in the engine’s valve train system.

Conclusion

The Rocker Lever Shaft, Cummins Part #3966658, plays a crucial role in the engine’s valve train mechanism, ensuring precise and efficient operation of the valves. Its durable construction, precise engineering, and compatibility with various Cummins engines make it a vital component for maintaining engine performance and reliability. Regular maintenance and proper installation are essential to maximize the benefits of this part and ensure the longevity of the engine.