137891
Hexagon Head Cap Screw
Cummins®

The Cummins Hexagon Head Cap Screw, identified by part number 137891, is a specialized fastener designed for use in heavy-duty truck components. This screw is integral to the assembly and maintenance of various truck parts, ensuring secure and reliable connections that withstand the rigors of heavy-duty applications.

Basic Concepts of Hexagon Head Cap Screws

A hexagon head cap screw is a type of fastener characterized by its hexagonal head, which allows for efficient tightening and loosening using a wrench or socket. These screws are commonly used in mechanical assemblies to secure components together, providing a strong and durable connection. The hexagonal shape of the head is designed to prevent the tool from slipping, ensuring precise torque application ¹.

Purpose and Role in Truck Operation

The Cummins Hexagon Head Cap Screw (Part #137891) plays a significant role in the operation and maintenance of heavy-duty trucks. It is used in various applications within the truck’s structure and engine components, such as securing engine mounts, attaching body panels, and fastening critical engine parts. Its robust design ensures that these connections remain intact under the stress and vibration experienced during truck operation ².

Key Features

The Cummins Hexagon Head Cap Screw boasts several key features that enhance its functionality and durability. It is typically made from high-strength steel, ensuring it can withstand significant loads and stresses. The screw features a coarse thread, which provides excellent holding power and resistance to loosening. Additionally, it may include unique design elements such as a corrosion-resistant coating to protect against rust and environmental damage ³.

Benefits

Using the Cummins Hexagon Head Cap Screw in truck assemblies offers several benefits. Its high-strength material and coarse thread design contribute to improved load distribution and enhanced security of components. The screw’s resistance to vibration and corrosion ensures long-lasting performance, reducing the need for frequent replacements and maintenance. This reliability is crucial for the safe and efficient operation of heavy-duty trucks ⁴.

Installation Guidelines

Proper installation of the Cummins Hexagon Head Cap Screw is vital to ensure optimal performance and longevity. The following guidelines should be observed:

1. Clean the installation area to remove any debris or contaminants.
2. Use the appropriate wrench or socket to tighten the screw gradually, avoiding sudden or excessive force.
3. Apply the specified torque using a torque wrench to ensure the screw is tightened to the manufacturer’s recommended settings.
4. Verify the connection is secure and check for any signs of damage or misalignment.

Troubleshooting and Maintenance

Common issues with hexagon head cap screws in truck applications include loosening due to vibration, corrosion, and wear. To address these issues:

1. Regularly inspect screws for signs of corrosion or damage.
2. Re-tighten screws as needed to maintain secure connections.
3. Replace screws that show significant wear or corrosion to prevent failure.
4. Apply a thread locker or anti-seize compound to enhance resistance to loosening and corrosion.

Safety Considerations

When handling and installing the Cummins Hexagon Head Cap Screw, it is important to observe several safety practices:

1. Wear appropriate personal protective equipment (PPE), including gloves and safety glasses, to protect against injury.
2. Use the correct tools and follow torque specifications to avoid over-tightening, which can damage threads or components.
3. Ensure the work area is clean and free of hazards to prevent accidents during installation.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes diesel and natural gas engines, as well as related technologies. With a history spanning over a century, Cummins is renowned for producing high-quality components that meet the demanding requirements of heavy-duty applications. The company’s commitment to innovation and excellence is reflected in its wide range of products, including the Cummins Hexagon Head Cap Screw, which is designed to deliver reliable performance in the most challenging environments.

Cummins Hexagon Head Cap Screw 137891 in Engine Applications

The Cummins Hexagon Head Cap Screw part number 137891 is a critical component in several engine models, ensuring secure fastening and structural integrity. This part is integral to the assembly and maintenance of the following engines:

K19 Engines

In the K19 engines, the 137891 screw is used in various applications to secure different parts of the engine assembly. Its robust design and high-strength properties make it ideal for maintaining the alignment and stability of engine components under high operational stress.

QSK19 CM850 MCRS Engines

For the QSK19 CM850 MCRS engines, the 137891 screw is utilized in several key areas. It is often found in the cylinder head assembly, where it helps to secure the cylinder head to the engine block, ensuring a tight seal and preventing leaks. Additionally, it is used in other critical assemblies to maintain the structural integrity of the engine.

QSK50 CM2150 MCRS Engines

In the QSK50 CM2150 MCRS engines, the 137891 screw plays a vital role in the engine’s assembly and maintenance. It is commonly used in the engine block and head assembly to ensure that all components are securely fastened. Its application extends to other parts of the engine, where it helps to maintain the precise alignment and stability required for optimal engine performance.

The use of the 137891 screw across these engines highlights its versatility and importance in ensuring the reliability and durability of the engine assemblies.

Role of Part 137891 Hexagon Head Cap Screw in Engine Systems

Part 137891, the Hexagon Head Cap Screw, is integral to the assembly and functionality of various engine components. Its robust design ensures secure fastening, which is essential for the reliable operation of these parts.

Alternator Bracket Kit

In the alternator bracket kit, Part 137891 is used to firmly attach the alternator to its bracket. This secure mounting is vital for maintaining the alternator’s alignment and ensuring it operates efficiently without undue stress or movement.

Arrangement

When it comes to the arrangement of engine components, Part 137891 plays a key role in maintaining the structural integrity of the assembly. It helps in securing various parts together, ensuring that they remain in the correct position and orientation during engine operation.

Turbocharger

For the turbocharger, Part 137891 is employed to fasten the turbocharger to the engine block or manifold. This secure attachment is necessary to withstand the high pressures and temperatures generated during operation, ensuring the turbocharger functions optimally.

Manifold

In the manifold, Part 137891 is utilized to connect the manifold to the engine block. This connection must be tight and secure to prevent leaks and ensure efficient airflow, which is critical for engine performance.

Exhaust

Within the exhaust system, Part 137891 is used to attach various exhaust components, such as the catalytic converter and muffler, to the manifold and other exhaust parts. This ensures a sealed and robust exhaust path, minimizing emissions and noise.

Oil Pan

For the oil pan, Part 137891 is essential in securing the oil pan to the engine block. A tight and secure fit is necessary to prevent oil leaks and ensure the oil pan can withstand the pressures and vibrations of engine operation.

Oil Pan Mounting

In oil pan mounting applications, Part 137891 is used to attach the oil pan mounting brackets to the engine frame. This secure attachment is vital for maintaining the oil pan’s position and ensuring it can effectively collect and store engine oil.

Conclusion

The Cummins Hexagon Head Cap Screw, part number 137891, is a critical component in the assembly and maintenance of heavy-duty truck engines. Its robust design, high-strength material, and resistance to corrosion and vibration make it an essential fastener for ensuring the reliability and durability of engine components. Proper installation and maintenance of this part are vital for the safe and efficient operation of heavy-duty trucks.