4938657
Rocker Lever Housing
Cummins®

The Rocker Lever Housing Assembly, Part #4938657 by Cummins, is a component integral to the engine system of heavy-duty trucks. Manufactured by Cummins Inc., a leader in the commercial truck industry, this assembly is designed to enhance engine performance and reliability.

Function and Operation

The Rocker Lever Housing Assembly operates within the engine by housing the rocker levers, which are pivotal in the valve actuation process. It interacts with the camshaft and valve train, ensuring precise and efficient operation of the engine’s intake and exhaust valves. The assembly facilitates the transfer of motion from the camshaft to the valves, allowing for optimal engine breathing and performance ¹.

Purpose of the Rocker Lever Housing Assembly

This Cummins part plays a role in the operation of a truck by contributing to the engine’s performance and efficiency. It ensures that the valves open and close at the correct times, which is vital for maintaining engine balance, power output, and fuel efficiency. By providing a stable and secure environment for the rocker levers, the assembly helps to reduce wear and tear on the valve train components, leading to longer engine life ².

Key Features

The primary features of the Rocker Lever Housing Assembly include its robust material composition, typically made from high-strength cast iron or aluminum, which offers durability and resistance to wear. The design elements incorporate precise machining to ensure a perfect fit and optimal performance. Unique characteristics may include integrated lubrication channels to enhance component longevity and reduce friction ³.

Benefits

The Rocker Lever Housing Assembly provides several advantages, including improved engine reliability through its durable construction and precise engineering. It enhances engine durability by protecting the rocker levers from excessive wear and damage. Additionally, the assembly contributes to overall engine performance by ensuring efficient valve operation, which is crucial for maintaining power output and fuel efficiency.

Installation Process

Proper installation of the Rocker Lever Housing Assembly involves several steps. First, ensure the engine is clean and free of debris. Next, align the assembly with the mounting points on the engine block and secure it in place using the appropriate fasteners. It is important to torque the fasteners to the manufacturer’s specified values to ensure a proper fit and prevent leaks. Finally, verify the alignment of the rocker levers and camshaft to ensure smooth operation.

Common Issues and Troubleshooting

Typical problems associated with the Rocker Lever Housing Assembly may include leaks, misalignment, or wear on the rocker levers. Troubleshooting methods involve inspecting the gaskets and seals for damage, ensuring proper alignment of the assembly with the camshaft and valve train, and checking for signs of wear or damage on the rocker levers. Solutions may include replacing damaged gaskets, readjusting the assembly, or replacing worn components.

Maintenance Tips

To ensure the longevity and optimal performance of the Rocker Lever Housing Assembly, regular maintenance practices are recommended. This includes periodic inspection of the gaskets and seals for signs of wear or leaks, ensuring the fasteners remain torqued to the specified values, and checking the alignment and condition of the rocker levers. Additionally, following the manufacturer’s recommended service intervals for engine maintenance can help prevent issues related to the assembly.

Cummins Overview

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 history spanning over a century, Cummins has established a strong reputation in the commercial truck industry for producing reliable, high-performance engines and components. The company’s extensive product range and commitment to innovation have made it a preferred choice for heavy-duty truck applications.

Compatibility with Cummins Engines

The Rocker Lever Housing Assembly, part number 4938657, is a critical component in the operation of several Cummins engines. This assembly is designed to house and support the rocker levers, which are essential for the proper functioning of the engine’s valve train. The following Cummins engines are compatible with this part:

B6.7 Series Engines

• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125

ISB Series Engines

• ISB CM2150
• ISB/ISD6.7 CM2150 SN
• ISB5.9 CM2880 B110
• ISB6.7 CM2250

ISBE Series Engines

• ISBE CM2150
• ISBE CM800
• ISBE4 CM850

QSB Series Engines

• QSB5.9 CM2880 B115
• QSB6.7 CM2250
• QSB6.7 CM850 (CM2850)
• QSB6.7 M CM2250
• QSB7 CM2880 B117

Each of these engines, despite their differences in size and configuration, shares a common need for the Rocker Lever Housing Assembly to maintain the proper operation of the valve train system. This compatibility underscores the importance of this component in the overall functionality and reliability of Cummins engines.

Role of Part 4938657 Rocker Lever Housing Assembly in Engine Systems

The Rocker Lever Housing Assembly, identified by part number 4938657, is an integral component in the operation of various engine systems. This assembly is designed to house and support the rocker levers, which are pivotal in translating the motion from the camshaft to the valves.

In the context of a long block engine configuration, the Rocker Lever Housing Assembly is positioned above the cylinder head. It provides a stable and secure environment for the rocker levers to operate efficiently. The housing ensures that the rocker levers maintain proper alignment and clearance with the valve stems, which is essential for optimal valve operation.

The rocker levers themselves are mounted within the housing and are responsible for amplifying the motion from the camshaft lobes. As the camshaft rotates, it pushes against the rocker levers, which then transfer this motion to the valves. The precise fit and support offered by the Rocker Lever Housing Assembly are vital for minimizing friction and wear on the rocker levers.

The lever mechanism within the housing is designed to provide a mechanical advantage, allowing for efficient valve actuation. This is particularly important in high-performance engines where precise and rapid valve movement is necessary to achieve optimal combustion efficiency.

Conclusion

In summary, the Rocker Lever Housing Assembly (part 4938657) plays a significant role in ensuring the smooth and efficient operation of the valve train within engine systems. Its design and placement are essential for maintaining the integrity and performance of the rocker levers and, by extension, the entire valve actuation system.