3940251
Hexagon Head Cap Screw
Cummins®

Introduction

The Cummins 3940251 Hexagon Head Cap Screw is a specialized fastener designed for use in commercial trucks. It is engineered to meet the demanding requirements of heavy-duty applications, ensuring reliable performance and durability in various truck components. This screw is integral to the assembly and maintenance of commercial trucks, providing secure fastening in critical areas.

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 standard hexagonal tools such as wrenches or sockets. The design of the hexagon head provides a secure grip, minimizing the risk of cam-out during installation. These screws are commonly used in applications requiring high strength and resistance to loosening under vibration ¹.

Purpose and Role in Truck Operation

The Cummins 3940251 Hexagon Head Cap Screw plays a significant role in the operation and maintenance of commercial trucks. It is utilized in various applications within the truck, including engine components, chassis assemblies, and other critical systems. The screw ensures that parts remain securely fastened, contributing to the overall stability and performance of the truck. Its application areas include but are not limited to engine mounts, bracket assemblies, and structural reinforcements ².

Key Features

The Cummins 3940251 Hexagon Head Cap Screw boasts several key features that enhance its functionality and durability. It is composed of high-strength materials, typically alloy steel, which provides excellent resistance to wear and corrosion. The screw features a coarse thread, which allows for quick and secure fastening. The hexagonal head design ensures easy installation and removal using standard tools, while the cap under the head provides additional surface area for load distribution, reducing the risk of stripping.

Benefits

Using the Cummins 3940251 Hexagon Head Cap Screw offers several benefits. Its high-strength material composition ensures enhanced durability, making it suitable for heavy-duty applications. The screw’s design resists vibration loosening, which is crucial in the dynamic environment of a commercial truck. Additionally, the hexagonal head allows for easy use with standard tools, facilitating quick and efficient installation and maintenance.

Installation Guidelines

Proper installation of the Cummins 3940251 Hexagon Head Cap Screw is vital to ensure secure fastening and optimal performance. Follow these step-by-step guidelines:

1. Prepare the Surface: Ensure the mating surfaces are clean and free of debris to promote a strong bond.
2. Align the Screw: Position the screw in the designated hole, ensuring it is properly aligned.
3. Initial Tightening: Use a wrench or socket to begin tightening the screw. Apply even pressure to avoid cross-threading.
4. Torque Specification: Tighten the screw to the recommended torque specification, typically provided in the truck’s maintenance manual. This ensures the screw is securely fastened without over-tightening.
5. Final Check: Verify the screw is snug and there is no movement. Re-check the torque if necessary.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening due to vibration and corrosion. To troubleshoot and maintain the screws:

• Regular Inspection: Periodically check the screws for signs of loosening or corrosion.
• Re-tightening: If a screw appears loose, re-tighten it to the specified torque.
• Corrosion Protection: Apply a corrosion-resistant coating or lubricant to protect the screws from environmental factors.
• Replacement: If a screw shows significant wear or damage, replace it with a new one to maintain structural integrity.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. Founded in 1919, Cummins has a long-standing reputation for quality and innovation in the commercial truck industry. The company is committed to providing reliable and efficient components that enhance the performance and longevity of commercial vehicles. Cummins’ dedication to excellence is evident in its comprehensive range of truck components, including the Cummins 3940251 Hexagon Head Cap Screw ³.

Hexagon Head Cap Screw 3940251 in Cummins Engines

The Hexagon Head Cap Screw 3940251, manufactured by Cummins, is a critical component in several engine models. This screw is integral to the assembly and maintenance of these engines, ensuring secure fastening and stability.

G5.9 and G8.3 Engines

In the G5.9 and G8.3 engines, the Hexagon Head Cap Screw 3940251 is used in various applications where a reliable fastening solution is required. These engines, known for their durability and efficiency, rely on this screw to maintain the integrity of their structural components.

G855 Engine

The G855 engine also incorporates the Hexagon Head Cap Screw 3940251 in its design. This engine, designed for high performance and reliability, uses the screw in several key areas to ensure that all parts are securely fastened and aligned.

GTA8.3 CM558 Engine

In the GTA8.3 CM558 engine, the Hexagon Head Cap Screw 3940251 plays a vital role in the engine’s assembly. This engine, which combines advanced technology with robust performance, utilizes the screw to secure various components, ensuring the engine operates smoothly and efficiently.

Each of these engines benefits from the precision and strength of the Hexagon Head Cap Screw 3940251, highlighting its importance in the overall functionality and longevity of the engine systems.

Role of Part 3940251 Hexagon Head Cap Screw in Engine Systems

The part 3940251 Hexagon Head Cap Screw is integral in securing various components within engine systems, ensuring stability and proper function.

In the Governor system, this screw is often used to fasten the governor housing to the engine block, maintaining the alignment and integrity of the governor mechanism. This is essential for the consistent regulation of engine speed.

Within the Electronic Linkage system, the screw plays a role in securing the electronic control unit (ECU) to the engine frame. This ensures that the ECU remains firmly in place, allowing for precise electronic control over engine functions.

For the Governor Control components, the screw is employed to attach the governor control arm to the engine. This secure attachment is vital for the accurate modulation of fuel delivery based on engine load and speed.

In terms of Location, the screw is frequently utilized in attaching sensors and other monitoring devices to the engine. This ensures that these components are correctly positioned to provide accurate readings and data.

Regarding the Fuel Filter assembly, the screw is used to secure the filter housing to the engine or fuel line. This attachment is important for maintaining the filter’s position and ensuring efficient filtration of fuel before it reaches the engine.

In the Module systems, such as those involving fuel injection or ignition, the screw is used to fasten module components to the engine. This secures the modules in place, ensuring they operate within the designed parameters.

Lastly, in the Fuel Control system, the screw is instrumental in attaching fuel control units to the engine. This secure attachment is necessary for the reliable regulation of fuel flow, contributing to efficient engine performance.

Conclusion

The Cummins 3940251 Hexagon Head Cap Screw is a vital component in the assembly and maintenance of commercial trucks and engines. Its high-strength material, secure fastening capabilities, and resistance to vibration and corrosion make it an essential part in ensuring the reliability and performance of heavy-duty applications. Proper installation and maintenance of this screw are crucial for the longevity and efficiency of truck and engine systems.