3004200
Head Locking Screw
Cummins®

The Head Locking Screw 3004200, a component manufactured by Cummins, plays a significant role in the assembly and operation of heavy-duty truck engines. This screw ensures the secure attachment of the cylinder head, which is vital for the engine’s performance and longevity. Cummins, known for its quality and extensive history in the automotive industry, provides this component as part of its comprehensive range of engine parts designed to meet the demanding requirements of heavy-duty applications ¹.

Function and Operation

The Head Locking Screw operates by securing the cylinder head to the engine block. This attachment is crucial for maintaining the integrity of the engine’s combustion chamber, ensuring that the pressures and temperatures generated during operation are contained effectively. By providing a strong and reliable connection, the screw helps in preserving the engine’s efficiency and reliability over time ².

Key Features

This Cummins part is characterized by several key features that enhance its performance. It is made from high-strength materials, ensuring durability under the extreme conditions found in heavy-duty engines. The design of the screw includes precise threading and a robust head, which facilitates easy installation and removal while providing a secure fit. Additionally, the screw may feature unique characteristics such as a locking mechanism to prevent loosening over time, further enhancing its reliability ³.

Benefits

Utilizing the 3004200 offers several advantages. It contributes to improved engine reliability by ensuring a secure cylinder head attachment, which is fundamental for the engine’s operation. The screw’s design also enhances sealing properties, helping to maintain optimal combustion efficiency. Furthermore, its robust construction and secure fit contribute to the overall efficiency and longevity of the engine.

Installation Process

Proper installation of the Head Locking Screw is critical for its effectiveness. The process involves cleaning the mating surfaces to ensure a proper seal, aligning the screw with the designated hole in the cylinder head, and tightening it to the torque specifications provided by Cummins. This ensures that the screw is securely fastened without over-tightening, which could damage the thread or the cylinder head.

Maintenance and Troubleshooting

Regular maintenance of the Head Locking Screw includes checking for signs of wear or damage and ensuring it remains securely fastened. Common issues may include loosening of the screw or damage to the thread, which can be addressed by re-torquing the screw to the manufacturer’s specifications or replacing it if necessary. It’s important to follow Cummins’ guidelines for maintenance to ensure the screw continues to perform its function effectively.

Safety Considerations

When working with the Head Locking Screw, it’s important to observe several safety practices. This includes using the appropriate tools for installation and removal to prevent damage to the screw or the engine. Additionally, ensuring the engine is cool before beginning work can help prevent burns or other injuries. Always refer to Cummins’ safety guidelines and use personal protective equipment as necessary.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a strong presence in the heavy-duty truck sector, Cummins is renowned for its innovative solutions and commitment to quality. The company’s extensive product range and reputation for reliability make it a preferred choice for professionals in the automotive industry.

Compatibility

The Head Locking Screw, part number 3004200, is compatible with various Cummins engine series, including the K19 and QSK19 series. In these engines, the screw is used to secure the cylinder head to the block, ensuring that the head gasket maintains its position and the engine operates efficiently without any leaks.

Role of the 3004200 in Engine Systems

The 3004200 is integral to the secure assembly and operation of various engine components. Its primary function is to ensure that the head of the engine remains firmly attached, preventing any unwanted movement or separation during operation.

Accessories

In the context of engine accessories, the Head Locking Screw ensures that accessories mounted on the engine head, such as sensors or emission control devices, remain stable and correctly positioned. This stability is essential for the accurate functioning of these accessories.

Fuel System

For the fuel system, the secure attachment of the engine head is vital. The Head Locking Screw helps maintain the integrity of the fuel injector mounting points and fuel rail connections. This ensures consistent fuel delivery and prevents leaks that could arise from head movement.

Damper and Vibration Control

The Head Locking Screw contributes to the overall stability of the engine by securing the head, which helps in reducing vibrations that could otherwise affect the damper’s performance and the engine’s smooth operation.

Flexplate and Flywheel

In engines equipped with a flexplate or flywheel, the Head Locking Screw ensures that the engine head does not shift, which is important for the proper engagement of the flexplate with the starter motor and the flywheel with the clutch. This secure attachment is essential for reliable starts and smooth gear engagement.

Kit and Misc Mounting

For engine kits and miscellaneous mounting components, the Head Locking Screw is often a key element. It ensures that all mounted components, whether part of a kit or individual items, remain fixed in place. This is particularly important for components that require precise alignment and secure attachment to function correctly.

Mounting Flywheel

Specifically, in the mounting of the flywheel, the Head Locking Screw ensures that the engine head does not move, which is crucial for the consistent operation of the flywheel. This stability is necessary for the reliable transfer of power from the engine to the transmission.

Conclusion

Overall, the 3004200 Head Locking Screw is a fundamental component in maintaining the structural integrity and operational efficiency of various engine systems. Its role in securing the cylinder head is crucial for the engine’s performance, reliability, and longevity.