5486335
Rocker Lever
Cummins®

The Cummins 5486335 Rocker Lever is a component designed for use in commercial truck engines. It plays a role in the engine’s valve train, contributing to the overall performance and efficiency of the truck. Understanding its purpose and significance is important for maintaining and optimizing the operation of commercial trucks.

Basic Concepts of Rocker Levers

A rocker lever, also known as a rocker arm, is a mechanical component used in internal combustion engines. It acts as a lever that transfers motion from the camshaft to the valves. When the camshaft rotates, it pushes against the rocker lever, which then opens and closes the engine’s valves at precise intervals. This mechanism ensures that the air-fuel mixture enters the combustion chamber at the correct time and that exhaust gases are expelled efficiently ¹.

Purpose of the 5486335 Rocker Lever

The 5486335 Rocker Lever is specifically engineered to fit within the valve train of certain Cummins engines. Its role is to facilitate the opening and closing of the engine valves in response to the camshaft’s motion. This component interacts with the camshaft, pushrods, and valves, ensuring that the valve events occur with the necessary precision and timing for optimal engine performance ².

Key Features

The 5486335 Rocker Lever is constructed from high-quality materials to withstand the demanding conditions within a commercial truck engine. Its design includes features such as a hardened surface to resist wear, precise machining for accurate valve actuation, and a robust construction to handle the high stresses and temperatures of engine operation ³.

Benefits

The use of the 5486335 Rocker Lever in a truck engine can lead to several benefits. These include improved engine performance due to precise valve actuation, enhanced durability under high-stress conditions, and increased reliability, which contributes to the overall longevity of the engine ⁴.

Installation Process

Installing the 5486335 Rocker Lever requires careful attention to detail. The process involves removing the old rocker lever, inspecting the valve train components for wear or damage, and then positioning the new rocker lever in place. Proper torque specifications must be followed to secure the rocker lever without overtightening, which could lead to damage ¹.

Troubleshooting Common Issues

Common issues with the 5486335 Rocker Lever may include noise from the valve train, inconsistent engine performance, or visible wear on the rocker lever itself. Troubleshooting steps may involve inspecting the rocker lever for signs of wear, checking the clearance between the rocker lever and other components, and ensuring that all fasteners are properly torqued ².

Maintenance Tips

Regular maintenance of the 5486335 Rocker Lever is important for ensuring its longevity and optimal performance. This includes periodic inspections for wear or damage, ensuring proper lubrication, and following the manufacturer’s recommendations for replacement intervals. Keeping the valve train clean and free of debris also contributes to the efficient operation of the rocker lever ³.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, related technologies, and services. With a history of innovation and a commitment to quality, Cummins has established a strong reputation in the commercial truck industry for producing reliable and efficient engines ⁴.

Compatibility of Rocker Lever Part 5486335 with Cummins Engines

The Rocker Lever part 5486335, manufactured by Cummins, is designed to fit seamlessly with a range of Cummins engines. This part is integral to the engine’s operation, ensuring smooth and efficient valve actuation. Here is a detailed look at its compatibility with specific engine models:

X11 CM2670 X126B and X13 CM2670 X122B

The Rocker Lever part 5486335 is compatible with the X11 CM2670 X126B and X13 CM2670 X122B engines. These engines are part of the CM2670 series, known for their robust performance and reliability. The rocker lever ensures precise valve timing and operation, contributing to the engine’s overall efficiency and longevity.

X12 CM2350 X119B and X12 CM2670 X121B

The same rocker lever part number is also suitable for the X12 CM2350 X119B and X12 CM2670 X121B engines. These engines, while differing in their specific model numbers, share a commonality in their design that allows for the use of the 5486335 rocker lever. This compatibility ensures that the engines can maintain optimal performance with minimal maintenance issues.

X12N CMMDG1 X143B

The Rocker Lever part 5486335 is also compatible with the X12N CMMDG1 X143B engine. This engine model, while distinct, benefits from the precision and reliability offered by this rocker lever. The part’s design ensures that it fits perfectly within the engine’s architecture, facilitating smooth valve operation and enhancing the engine’s overall performance.

By ensuring that the Rocker Lever part 5486335 is compatible with these engines, Cummins maintains a high standard of quality and reliability across its engine lineup. This compatibility allows for easier maintenance and repair, as technicians can use a single part number for multiple engine models, simplifying inventory management and reducing downtime.

Part 5486335 Rocker Lever Component Usage

The part 5486335 Rocker Lever is an integral component in the operation of the engine’s valve train system. It is designed to transfer motion from the camshaft to the valves, ensuring precise and efficient valve operation.

Interaction with the Cylinder Head

The Rocker Lever is mounted on the cylinder head, where it plays a key role in amplifying the motion of the camshaft. As the camshaft rotates, it pushes against one end of the Rocker Lever, which then pivots on its fulcrum. This pivoting motion is transferred to the other end of the lever, which is connected to the valve stem.

Valve Operation

When the camshaft lobe contacts the Rocker Lever, it causes the lever to rock, lifting the connected valve off its seat. This action allows air and fuel to enter the combustion chamber (intake valve) or exhaust gases to exit (exhaust valve). The Rocker Lever ensures that the valve opens to the correct height and duration, which is essential for optimal engine performance and efficiency.

Precision and Reliability

The design of the Rocker Lever allows for a mechanical advantage, meaning that a small movement of the camshaft can result in a larger movement of the valve. This is important for achieving the necessary valve lift while maintaining a compact and efficient engine design. The Rocker Lever must be precisely machined and installed to ensure smooth operation and longevity of the valve train components.

Maintenance and Adjustment

Regular maintenance of the Rocker Lever is important to ensure it functions correctly. This includes checking for proper clearance between the valve and the lever, as well as ensuring that the lever pivots smoothly without excessive wear or play. Adjustments may be necessary to maintain the correct valve lash, which is the clearance between the valve and the Rocker Lever, to prevent valve train noise and potential engine damage.

Conclusion

The 5486335 Rocker Lever is a vital component that ensures the efficient and reliable operation of the engine’s valve train system by transferring and amplifying the motion from the camshaft to the valves. Its compatibility with various Cummins engines, combined with its robust design and precise machining, makes it an essential part for maintaining optimal engine performance.