3908522
Hexagon Head Cap Screw
Cummins®

The Cummins Hexagon Head Cap Screw, part number 3908522, is a component utilized in commercial truck applications. This screw is designed for fastening purposes in heavy-duty trucks, ensuring secure connections in various parts of the vehicle. Its role is significant in maintaining the structural integrity and operational efficiency of commercial trucks. This document provides an overview of the screw’s design, purpose, and application within the context of heavy-duty truck operations.

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 torque application using a wrench or socket. This design minimizes the risk of rounding the head during tightening or loosening, enhancing the screw’s functionality in fastening applications. The hexagonal shape provides a firm grip, facilitating secure and precise fastening. These screws are commonly used in various mechanical and structural applications due to their reliability and ease of use ¹.

Role of the 3908522 Hexagon Head Cap Screw in Truck Operation

This Cummins part plays a specific role in the operation and maintenance of commercial trucks. It is applied in areas such as engine components, chassis parts, and other critical assemblies where secure fastening is required. This screw ensures that parts remain firmly attached, contributing to the truck’s overall performance and safety. Its application is crucial in environments where vibrations and stresses are common, ensuring that connections remain intact under demanding conditions ².

Key Features

The 3908522 features a design that includes a specific material composition, thread type, and may incorporate special coatings or treatments. These features are selected to enhance the screw’s performance and durability in the demanding environments typical of commercial truck operations. The material composition ensures strength and resistance to wear, while the thread type provides a secure fit. Special coatings may be applied to improve corrosion resistance and ease of installation and removal ³.

Benefits

This part offers several benefits that contribute to the reliability and maintenance of commercial trucks. These include improved fastening security, resistance to corrosion, and ease of installation and removal. The screw’s design allows for secure connections that can withstand the stresses and vibrations encountered in truck operations. Its resistance to corrosion ensures longevity in various environmental conditions, while the ease of installation and removal facilitates maintenance practices ⁴.

Troubleshooting and Maintenance

Common issues associated with Hexagon Head Cap Screws can include loosening over time due to vibrations or wear, and corrosion in exposed areas. Troubleshooting these issues involves inspecting the screw and surrounding components for signs of wear or damage, and ensuring that the screw is tightened to the manufacturer’s recommended torque settings. Regular maintenance practices, such as periodic inspection and re-tightening, can help ensure the longevity and performance of the 3908522 screw. Proper torque settings are essential to maintaining secure connections without over-tightening, which could lead to damage ⁵.

Compatibility with Engine Models

The 3908522 is a critical component in the assembly and maintenance of several engine models. This screw is designed to provide robust fastening capabilities, ensuring that various parts of the engine remain securely in place during operation.

Cummins 4B3.9 and 6B5.9 Engines

The 4B3.9 and 6B5.9 engines are part of the Cummins B Series engines, known for their reliability and performance in various applications. The 3908522 is used in these engines to secure different components, ensuring that the engine operates smoothly and efficiently. Its design allows for easy installation and removal, which is crucial during maintenance procedures.

B5.9 G Engine

The B5.9 G engine is another variant in the Cummins B Series lineup. This engine benefits from the 3908522 in several critical areas. Its use in this engine ensures that the fastening points are reliable, which is essential for maintaining the structural integrity of the engine.

ISB (Chrysler) Engines

The ISB engines, particularly those used in Chrysler vehicles, are known for their durability and power. The 3908522 is integral to the assembly of these engines, providing the necessary strength to hold various parts together. Its use in these engines ensures that the fastening points can withstand the rigors of daily use.

ISB CM550 and ISB CM850 Engines

The ISB CM550 and ISB CM850 engines are part of the Cummins ISB series, designed for heavy-duty applications. The 3908522 is used extensively in these engines to secure components that are subjected to high stress and vibration. Its design ensures that these parts remain firmly in place, contributing to the overall reliability and performance of the engine.

Role of 3908522 in Engine Systems

The 3908522 is integral to the assembly and maintenance of several key components within engine systems. Its primary function is to provide secure fastening, ensuring that parts remain firmly in place under the high stress and vibration conditions typical of engine operation.

Flexplate and Flexplate Service Kit

In automatic transmission systems, the flexplate serves as a connection between the engine and transmission, transferring rotational force. The 3908522 is often used to attach the flexplate to the crankshaft, ensuring a stable and reliable connection. When servicing the flexplate, the screw is part of the flexplate service kit, facilitating the reassembly process by providing the necessary fastening hardware to secure the flexplate in its correct position.

Flywheel and Flywheel Service Kit

For manual transmission systems, the flywheel plays a similar role to the flexplate, acting as the interface between the engine and transmission. The 3908522 is employed to attach the flywheel to the crankshaft, guaranteeing that the flywheel remains securely fastened during operation. In a flywheel service kit, this screw is included to aid in the reinstallation of the flywheel, ensuring that all components are correctly and safely reassembled.

Mounting Components

The 3908522 is also utilized in various mounting applications within the engine system. It is commonly found in the mounting of ancillary components such as alternators, starter motors, and other accessories that require a robust and vibration-resistant fastening solution. The screw’s hexagonal head allows for easy tightening and loosening using common hand tools, making it a practical choice for both initial installation and maintenance procedures.

Service Kit Integration

In both flexplate and flywheel service kits, the 3908522 is a standard component. These kits are designed to provide all necessary hardware for the repair or replacement of these critical engine components. The inclusion of the 3908522 ensures that technicians have the correct fastener on hand, reducing the need for additional procurement and streamlining the service process.

Conclusion

Overall, the 3908522 Hexagon Head Cap Screw plays a significant role in maintaining the integrity and functionality of engine systems by providing reliable fastening solutions for key components. Its design, material composition, and application across various engine models highlight its importance in ensuring the engines’ operational integrity and longevity.