4067809
Rocker Lever Adjusting Screw
Cummins®

The Rocker Lever Adjusting Screw, part number 4067809, manufactured by Cummins, is a critical component in the engine assembly of the QST30 CM2350 T101 and QST30 CM552 engines. This part plays a pivotal role in the engine’s operation by ensuring the proper adjustment and alignment of the rocker levers, which are essential for the valve timing and engine performance ¹.

Function and Operation

The Rocker Lever Adjusting Screw operates within the engine’s valve train system, where it maintains proper valve clearance. This screw allows for the fine-tuning of the distance between the rocker arm and the valve stem, which is crucial for the efficient opening and closing of engine valves. Proper valve clearance ensures that the valves operate within their designed parameters, contributing to the overall performance and longevity of the engine ².

Purpose of the Rocker Lever Adjusting Screw

The 4067809 Rocker Lever Adjusting Screw serves a specific function in the operation of a truck engine. By allowing for the adjustment of valve clearance, it contributes to the engine’s performance and reliability. This adjustment capability is vital for accommodating thermal expansion and wear, ensuring that the engine valves continue to operate efficiently over time ³.

Key Features

The 4067809 Rocker Lever Adjusting Screw is designed with several key features that enhance its functionality. It is constructed from high-quality materials to withstand the harsh conditions within an engine environment. The screw’s design allows for precise adjustments, ensuring that valve clearance can be fine-tuned to meet specific engine requirements. Additionally, its construction includes features that protect against corrosion and wear, further enhancing its durability and reliability.

Benefits

Using the 4067809 Rocker Lever Adjusting Screw offers several benefits. It contributes to improved engine efficiency by ensuring that valve operations are precise and consistent. This precision helps in maintaining optimal engine performance and can lead to increased fuel efficiency. Furthermore, the screw’s design and materials contribute to its longevity, reducing the need for frequent replacements. Ease of maintenance is another benefit, as the screw allows for straightforward adjustments without requiring extensive engine disassembly.

Installation Process

Installing the Rocker Lever Adjusting Screw involves several steps to ensure proper function and integration within the engine’s valve train system. Begin by ensuring the engine is cool and the valve train components are in their proper positions. Carefully thread the screw into the rocker arm, making incremental adjustments to achieve the desired valve clearance. It is important to follow the manufacturer’s specifications for torque and clearance settings to avoid over-tightening or under-tightening, which could lead to engine performance issues.

Troubleshooting Common Issues

Common issues associated with the Rocker Lever Adjusting Screw may include improper valve clearance, leading to engine misfires or reduced performance. To troubleshoot, first, verify the screw’s installation and adjustment. Ensure it is securely in place and that the valve clearance meets the manufacturer’s specifications. If issues persist, inspect the screw and surrounding components for signs of wear or damage, which may require replacement or further adjustment.

Maintenance Tips

Regular maintenance of the 4067809 Rocker Lever Adjusting Screw is crucial for ensuring its longevity and optimal performance. This includes periodic checks of valve clearance to ensure it remains within the specified range. Additionally, inspecting the screw and its components for signs of wear, corrosion, or damage can help identify potential issues before they lead to engine performance problems. Following the manufacturer’s maintenance schedule and guidelines will help maintain the screw’s functionality and contribute to the overall reliability of the engine.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a reputation for quality, reliability, and innovation in the heavy-duty truck industry. The company’s product range includes a variety of engines and components designed to meet the demanding requirements of commercial vehicles, contributing to the efficiency, performance, and reliability of these machines.

Conclusion

The Rocker Lever Adjusting Screw part number 4067809 is a vital component in the operation of heavy-duty truck engines, particularly within the valve train system. Its role in maintaining proper valve clearance ensures the efficient operation of engine valves, contributing to the overall performance and longevity of the engine. Regular maintenance and proper installation are key to maximizing the benefits of this Cummins part.