3902261
Hexagon Head Cap Screw
Cummins®

The Hexagon Head Cap Screw, specifically part number 3902261 manufactured by Cummins, is a critical component in the assembly and maintenance of commercial trucks. This overview explores the significance, design, and role of this part in ensuring the reliability and efficiency of commercial trucks.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a fastener with a hexagonal head, designed for efficient tightening and loosening using a wrench or socket. Its threaded shaft engages with internal threads in components, providing a secure fastening solution. In the automotive industry, cap screws are valued for their strength and reliability in joining various parts, ensuring assemblies remain intact under operational stresses ¹.

Purpose of the 3902261 Hexagon Head Cap Screw in Truck Operations

The 3902261 Hexagon Head Cap Screw secures critical components and assemblies in commercial trucks, from fastening engine parts to securing chassis components. It is valued for its ability to withstand high loads and vibrations, making it suitable for the demanding conditions encountered in truck operations ².

Key Features of the 3902261 Hexagon Head Cap Screw

This Cummins part is distinguished by its high-strength material composition, typically alloy steel, which provides resistance to wear and corrosion. It features a coarse thread type for quick and secure fastening and a hexagonal head design for easy installation and removal, ensuring efficient maintenance tasks ³.

Benefits of Using the 3902261 Hexagon Head Cap Screw

Utilizing this part offers several advantages, including enhanced strength to withstand high stresses and vibrations, resistance to loosening, and ease of installation and removal, simplifying maintenance tasks and allowing for quick and efficient repairs or adjustments ⁴.

Installation and Usage Guidelines

Proper installation of the 3902261 Hexagon Head Cap Screw involves selecting the appropriate size and type, tightening it to the recommended torque specification, and ensuring it is secure without over-tightening. Regular inspection and maintenance are recommended to ensure continued reliable performance.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening due to vibration or wear and corrosion in exposed applications. Regular inspection, applying a thread locker to prevent loosening, and using corrosion-resistant coatings can protect against environmental damage. Proper maintenance practices, such as regular inspection and timely replacement, can prolong the lifespan of the screw and ensure continued reliable performance.

Cummins: Manufacturer Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history of innovation and quality, Cummins has established a strong reputation in the commercial truck industry. The company’s commitment to quality and innovation is evident in its wide range of products, including the 3902261 Hexagon Head Cap Screw, which is designed to meet the demanding requirements of truck operations.

Cummins Engine Compatibility with Part 3902261

The 3902261 Hexagon Head Cap Screw is a versatile component that fits into various Cummins engine models. This screw is designed to provide secure fastening in applications where high strength and durability are essential. Below is a detailed look at how this part integrates with specific Cummins engines.

4B3.9 and 6B5.9 Engines

The 4B3.9 and 6B5.9 engines benefit from the use of the 3902261 Hexagon Head Cap Screw in several critical areas. This screw is often used in the engine’s mounting systems, ensuring that components are tightly secured to prevent any movement that could lead to mechanical failure. Its hexagonal head provides a larger surface area for tools, making it easier to install and remove.

6C8.3 and C GAS PLUS CM556 Engines

In the 6C8.3 and C GAS PLUS CM556 engines, the 3902261 screw is utilized in various structural applications. These engines, known for their robust design, require reliable fastening solutions to maintain integrity under high stress. The screw’s design allows for precise torque application, which is crucial for maintaining the alignment and stability of engine components.

C8.3 G and G8.3 Engines

The C8.3 G and G8.3 engines also incorporate the 3902261 Hexagon Head Cap Screw in their assembly. This screw is particularly useful in areas where frequent disassembly and reassembly are necessary, such as in the engine’s valve cover or other access points. Its high-strength properties ensure that these components remain securely fastened, even under the demanding conditions of engine operation.

By using the 3902261 Hexagon Head Cap Screw, Cummins ensures that these engines maintain their structural integrity and operational efficiency. This screw’s compatibility with multiple engine models highlights its versatility and importance in the engine assembly process.

Component Usage of the 3902261 Hexagon Head Cap Screw

The 3902261 Hexagon Head Cap Screw is integral to the assembly and functionality of various engine systems. Its role is to provide secure fastening in multiple components, ensuring the structural integrity and operational efficiency of the engine.

Accessories

In the realm of engine accessories, the Hexagon Head Cap Screw is employed to fasten components such as alternators, water pumps, and air conditioning compressors. These accessories rely on secure mounting to the engine block or bracket, which the screw achieves through its robust design.

Fuel System

Within the fuel system, this screw is used to secure fuel injectors, fuel rails, and various mounting brackets. Ensuring these components are firmly attached prevents leaks and maintains the precise fuel delivery required for optimal engine performance.

Electrical Starting System

For the electrical starting system, the Hexagon Head Cap Screw is vital in attaching the starter motor to the engine block. This secure attachment is necessary for the starter motor to effectively engage the flywheel and initiate engine cranking.

Housing and Flywheel

In the housing and flywheel assembly, the screw plays a role in fastening the flywheel to the crankshaft and securing the engine housing components. This ensures that the flywheel operates smoothly and that the housing maintains its structural integrity under operational stress.

Manual Engine Control System

The manual engine control system benefits from the use of this screw in securing throttle bodies, carburetors, and various linkage components. Accurate and secure fastening is essential for the precise control of air and fuel mixture, which is critical for engine performance.

Valve and Fuel Shutoff System

Finally, in the valve and fuel shutoff system, the Hexagon Head Cap Screw is used to secure components such as fuel shutoff valves and various valve covers. This ensures that these components remain in place and function correctly, contributing to the safe and efficient operation of the engine.

Conclusion

The 3902261 Hexagon Head Cap Screw by Cummins is a vital component in the assembly and maintenance of commercial trucks. Its design, featuring high-strength material and a hexagonal head, ensures secure fastening and ease of installation and removal. This part’s compatibility with various Cummins engine models and its use in critical engine systems underscore its importance in maintaining the structural integrity and operational efficiency of commercial trucks.