3967249
Hexagon Head Cap Screw
Cummins®

Introduction

The Cummins Part #3967249, a Hexagon Head Cap Screw, is a specialized fastener designed for use in commercial truck maintenance and operation. This part plays a significant role in ensuring the secure assembly of various truck components, contributing to the overall reliability and performance of the vehicle ².

Basic Concepts of Hexagon Head Cap Screws

A hexagon head cap screw is characterized by its hexagonal socket head, which allows for efficient torque application. This design facilitates the use of a hex key or socket wrench for installation and removal, providing a secure grip that minimizes the risk of cam-out. The screw’s threaded shaft engages with a corresponding internal thread, creating a strong and durable connection between components ³.

Purpose and Role in Truck Operation

This Cummins part is specifically engineered for use in commercial trucks. It contributes to the assembly and integrity of truck components by providing a robust fastening solution. This screw is often used in applications where high strength and resistance to vibration are required, ensuring that critical components remain securely attached during operation ².

Key Features

The 3967249 features several key attributes that enhance its performance and durability. It is composed of high-strength materials, typically alloy steel, which provides excellent tensile strength and resistance to wear. The screw has a fine or coarse thread, depending on the application, allowing it to engage securely with mating components. Additionally, it may include special coatings or treatments, such as zinc plating or black oxide, to improve corrosion resistance and longevity ¹.

Benefits

Using the 3967249 offers several advantages. Its design provides improved fastening strength, ensuring a secure connection between components. The hexagonal socket head allows for precise torque application, reducing the risk of over-tightening or under-tightening. The screw’s resistance to vibration loosening helps maintain a secure fastening over time, even in harsh operating conditions. Furthermore, its durable construction and protective coatings contribute to its longevity, making it a reliable choice for commercial truck applications ².

Installation Guidelines

Proper installation of this part is crucial for ensuring a secure and lasting fastening. Follow these step-by-step guidelines:

1. Select the appropriate hex key or socket wrench that matches the screw’s head size.
2. Align the screw with the corresponding threaded hole in the component.
3. Begin threading the screw by hand to ensure proper engagement.
4. Use the hex key or socket wrench to tighten the screw to the specified torque value. Refer to the manufacturer’s torque specifications for the correct setting.
5. Double-check the tightness of the screw to ensure it is securely fastened ³.

Troubleshooting and Maintenance

Common issues with hexagon head cap screws include loosening due to vibration, corrosion, and wear. To troubleshoot these problems:

• Inspect the screw and mating components for signs of corrosion or damage.
• Apply a thread locker or anti-seize compound to prevent loosening due to vibration.
• Replace the screw if it shows significant wear or damage.

Regular maintenance practices, such as periodic inspection and re-torqueing, can help prolong the life of the screw and ensure continued reliable performance ¹.

Safety Considerations

When working with hexagon head cap screws, it is important to follow safety practices to prevent injuries and ensure proper tool usage:

• Use the correct size hex key or socket wrench to avoid damaging the screw head.
• Wear personal protective equipment, such as gloves and safety glasses, to protect against flying debris.
• Be aware of the operational stresses on the screw and avoid over-tightening, which can lead to stripping or breakage ².

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes diesel and natural gas engines, as well as related technologies and components. Founded in 1919, Cummins has a long history of innovation and excellence in the commercial vehicle industry. The company provides a wide range of products, including engines, filtration systems, and fastening solutions, designed to meet the demanding requirements of commercial trucks and other heavy-duty applications. Cummins’ fastening solutions, such as the Part #3967249 Hexagon Head Cap Screw, are engineered to deliver reliable performance and durability in challenging environments ².

Application in Cummins Engines

The 3967249 is utilized in various Cummins engines for fastening critical components, ensuring structural integrity and operational efficiency.

6B5.9 and 6C8.3 Engines

In the 6B5.9 and 6C8.3 engines, this screw is used for fastening engine blocks, cylinder heads, and other critical assemblies. Its robust design ensures that these parts remain securely fastened under the high stress and varying temperatures typical of engine operation ².

B5.9 CM2670 B166C and QSB5.9 CM2880 B139 Engines

In the B5.9 CM2670 B166C and QSB5.9 CM2880 B139 engines, the Hexagon Head Cap Screw is used extensively in the assembly of the engine block and cylinder heads. Its precision manufacturing guarantees a tight and reliable fit, which is essential for maintaining the performance and longevity of these engines ².

C GAS PLUS CM556 and ISL9 CM2150 SN Engines

For the C GAS PLUS CM556 and ISL9 CM2150 SN engines, this screw is integral to the fastening of various engine components, including the intake and exhaust manifolds. Its use in these applications ensures that these parts are securely attached, contributing to the overall efficiency and reliability of the engine ².

L8.9 Engine

In the L8.9 engine, the Hexagon Head Cap Screw is employed in the assembly of the engine block and other critical components. Its design allows for easy installation and removal, facilitating maintenance and repair processes ².

Importance of the Hexagon Head Cap Screw

The Hexagon Head Cap Screw is a vital part in the assembly and maintenance of Cummins engines. Its design ensures that engine components are securely fastened, which is crucial for the performance and longevity of the engine. The screw’s precision manufacturing and robust construction make it suitable for use in a variety of engine applications, providing a reliable and durable fastening solution ².

Role of Part 3967249 in Engine Systems

The 3967249 is instrumental in ensuring the structural integrity and efficient operation of various engine components.

Support Component

In the support system of an engine, the Hexagon Head Cap Screw secures vital connections and joints. It is commonly used to fasten brackets, mounts, and other support structures that hold the engine in place within the vehicle’s chassis. This screw ensures that these supports remain firmly attached, minimizing vibrations and maintaining alignment, which is essential for the smooth operation of the engine ³.

Rear Engine Component

At the rear of the engine, the Hexagon Head Cap Screw plays a significant role in attaching components such as the exhaust manifold, rear engine mounts, and various sensor housings. By providing a strong and reliable fastening solution, it helps in maintaining the structural stability of the rear engine section. This is particularly important for components that are subject to high temperatures and mechanical stress, ensuring they remain securely in place under operating conditions ³.

Additionally, the screw is used in the attachment of rear engine covers and shields, which protect internal components from debris and external elements. Its hexagonal head design allows for easy tightening and removal using standard tools, facilitating maintenance and repair processes ³.

Conclusion

The Cummins Part #3967249 Hexagon Head Cap Screw is a critical component in the assembly and maintenance of various Cummins engines. Its robust design, precision manufacturing, and reliable performance make it an essential part for ensuring the structural integrity and efficient operation of engine components. Proper installation, regular maintenance, and adherence to safety practices are crucial for maximizing the benefits of this part in commercial truck applications.