4006238
Twelve Point Cap Screw
Cummins®

The Twelve Point Cap Screw (Part #4006238) by Cummins is a specialized fastener designed for use in commercial truck maintenance and operation. This component is integral to ensuring the secure assembly of various truck components, contributing to the overall reliability and performance of commercial vehicles.

Basic Concepts of Twelve Point Cap Screws

A twelve point cap screw is a type of fastener characterized by its hexagonal socket head, which provides a larger contact area compared to traditional hex-head screws. This design allows for more torque to be applied without rounding off the head, making it suitable for high-stress applications. In the automotive industry, twelve point cap screws are commonly used in applications requiring robust fastening solutions, such as engine components and chassis assemblies ¹.

Purpose and Role in Truck Operation

This part plays a role in the operation and maintenance of commercial trucks by securing critical components. It is utilized in engine assemblies to fasten parts that require high torque and resistance to loosening. Additionally, it is employed in chassis assemblies and other areas where durability and reliability are paramount ².

Key Features

The 4006238 Twelve Point Cap Screw features a robust design with a twelve-sided socket head, allowing for increased torque application without damaging the screw head. It is constructed from high-strength materials, ensuring durability under demanding conditions. The screw’s threading is designed to provide a secure fit, enhancing the structural integrity of truck assemblies ³.

Benefits

Using this Cummins part offers several benefits. Its design allows for improved torque application, reducing the risk of stripping or rounding off the screw head during installation. The screw’s resistance to loosening ensures that components remain securely fastened, even under vibration and dynamic loads. Additionally, its enhanced structural integrity contributes to the overall reliability of truck assemblies ⁴.

Installation Guidelines

Proper installation of the 4006238 Twelve Point Cap Screw involves several steps to ensure secure and lasting fastening. Begin by cleaning the installation area to remove any debris or contaminants. Use the appropriate torque wrench to apply the specified torque, ensuring the screw is tightened to the manufacturer’s recommendations. Employ the correct tools to avoid damaging the screw head, and follow best practices for tightening to achieve optimal performance ⁵.

Troubleshooting and Maintenance

Common issues with the 4006238 Twelve Point Cap Screw may include corrosion, stripping, or loosening. To address these problems, regularly inspect the screw and surrounding components for signs of wear or damage. If corrosion is present, clean the affected area and apply a corrosion-resistant coating. In cases of stripping or loosening, replace the screw with a new one to maintain the integrity of the assembly. Adhering to recommended maintenance practices will help prolong the service life of the screw ⁶.

Compatibility and Usage

The 4006238 Twelve Point Cap Screw is designed for use in Cummins engines and various commercial truck components. Its versatility allows it to be employed in a wide range of applications, from engine assemblies to chassis components. The screw’s reliability in various operating conditions makes it a valuable component in the maintenance and operation of commercial trucks ⁷.

Manufacturer Information - Cummins

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its high-quality products and innovative solutions. With a history of excellence and a diverse product range, Cummins has established a reputation for reliability and performance. The 4006238 Twelve Point Cap Screw is a testament to Cummins’ commitment to providing durable and effective components for the commercial truck market ⁸.

Role of Part 4006238 Twelve Point Cap Screw in Engine Systems

The 4006238 Twelve Point Cap Screw is instrumental in ensuring the secure assembly and reliable operation of various engine components. Its application spans across several key areas within the engine system, contributing to the overall performance and durability of the engine.

Camshaft Assembly

In the camshaft assembly, the Twelve Point Cap Screw is used to fasten the camshaft to the cylinder head. This secure attachment is vital for maintaining the precise alignment of the camshaft, which is essential for the accurate timing of valve operations. Proper valve timing is fundamental to the engine’s performance, ensuring efficient combustion and smooth operation ⁹.

Connecting Rod and Piston

The Twelve Point Cap Screw plays a significant role in the connecting rod and piston assembly. It is employed to secure the connecting rod cap to the rod body. This connection must withstand the high stresses and dynamic loads generated during engine operation. The secure fastening provided by the Twelve Point Cap Screw ensures that the connecting rod remains intact, contributing to the engine’s reliability and performance ¹⁰.

Cylinder Head and Cylinder Head Kit

When installing the cylinder head or a cylinder head kit, the Twelve Point Cap Screw is used to fasten the head to the engine block. This connection is critical for maintaining the seal between the head and block, preventing leaks and ensuring proper compression within the combustion chambers. The robust design of the Twelve Point Cap Screw provides the necessary strength to withstand the pressures and temperatures encountered in the cylinder head assembly ¹¹.

Fuel Manifold and Injector Plumbing

In the fuel system, the Twelve Point Cap Screw is utilized in the fuel manifold and injector plumbing. It secures components such as fuel rails and injectors, ensuring a tight and leak-free connection. This is essential for maintaining the integrity of the fuel delivery system, which directly impacts the engine’s fuel efficiency and performance ¹².

Injector Installation

For injector installation, the Twelve Point Cap Screw is used to secure the injectors in place. This ensures that the injectors are properly aligned and sealed, which is crucial for precise fuel delivery. Accurate fuel delivery is a key factor in achieving optimal engine performance and emissions control ¹³.

General Parts Performance

Across various engine components, the Twelve Point Cap Screw enhances parts performance by providing a secure and reliable fastening solution. Its design allows for easy installation and removal, reducing the risk of damage to surrounding components. This contributes to the overall efficiency and maintainability of the engine system ¹⁴.

Conclusion

The 4006238 Twelve Point Cap Screw by Cummins is a critical component in the maintenance and operation of commercial trucks. Its robust design, high-strength materials, and secure fastening capabilities make it indispensable in various engine and chassis applications. Proper installation, regular maintenance, and adherence to manufacturer guidelines ensure the longevity and reliability of this essential fastener.