3902663
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by Part #3902663, is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This screw is integral to the maintenance and operation of commercial trucks, providing secure fastening solutions that contribute to the overall reliability and performance of truck components.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt characterized by its hexagonal head and a flange beneath the head. This design allows for efficient tightening and loosening using a wrench or socket, while the flange provides additional surface area to distribute the load and prevent the screw from sinking into the material ¹. Within mechanical systems, these screws play a role in securing various components, ensuring they remain firmly in place under operational stresses.

Purpose and Role in Truck Operation

This Cummins part is designed to play a specific role in the operation and maintenance of commercial trucks. It is utilized in various truck components where secure fastening is required. This includes, but is not limited to, engine components, chassis parts, and other critical assemblies. The screw’s design ensures that components remain securely fastened, even under the dynamic conditions experienced by commercial trucks.

Key Features

The 3902663 features a hexagonal flange head, which facilitates easy installation and removal using standard tools. It is composed of high-strength materials, ensuring durability and resistance to wear. The flange design enhances the screw’s performance by providing a larger contact area, which helps distribute the load more evenly and reduces the risk of the screw pulling through the material.

Benefits

This part offers several benefits, including improved fastening security due to its design, which resists loosening from vibrations commonly experienced in truck operations. Its ease of installation and removal makes it a practical choice for maintenance tasks, reducing downtime. Additionally, the material composition ensures longevity and reliability in demanding applications.

Installation Guidelines

Proper installation of the 3902663 involves several steps to ensure optimal performance. Begin by selecting the appropriate size and grade of screw for the application. Use a wrench or socket to tighten the screw to the specified torque, ensuring it is secure without over-tightening, which could damage the screw or the material. Follow best practices for thread engagement and consider the use of thread lockers in applications where additional security is required.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include loosening due to vibration and corrosion. Regular inspection and maintenance can help identify and address these issues before they lead to component failure. If a screw shows signs of loosening, it should be re-tightened to the specified torque. In cases of corrosion, the affected screw should be replaced to ensure continued reliable performance.

Cummins 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 is evident in its product range, which includes a variety of components designed to enhance the performance, reliability, and efficiency of commercial trucks.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw (Part 3902663)

The Cummins Hexagon Flange Head Cap Screw, identified by part number 3902663, is a versatile component designed to fit a wide range of Cummins engines. This screw is integral in securing various engine parts and ensuring the structural integrity of the engine assembly. Below is a detailed breakdown of the engines that are compatible with this specific screw, grouped by engine series for clarity.

4B and 6B Series Engines

• 4B3.9
• 6B5.9

These engines, part of the earlier Cummins lineup, utilize the 3902663 screw in several critical applications, ensuring the secure attachment of engine components.

6C and B5.9 Series Engines

• 6C8.3
• B5.9 G

The 6C and B5.9 series engines also benefit from the use of the 3902663 screw, which is essential for maintaining the alignment and stability of various engine parts.

B6.7 Series Engines

• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125

The B6.7 series engines, known for their reliability and performance, incorporate the 3902663 screw in multiple configurations, ensuring robust fastening in high-stress environments.

C8.3 Series Engines

• C8.3 G

The C8.3 engine, recognized for its power and efficiency, also utilizes the 3902663 screw to secure various engine components, contributing to the engine’s overall durability.

D4.0 Series Engines

• D4.0 CM2620 D103B

The D4.0 engine, part of the newer Cummins lineup, integrates the 3902663 screw in its design, ensuring precise and reliable fastening.

F2.8 and F3.8 Series Engines

• F2.8 CM2620 F135B
• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F3.8 F102

These engines, known for their versatility and performance, use the 3902663 screw in various configurations to maintain the integrity of the engine assembly.

F4.5 Series Engines

• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

The F4.5 series engines, designed for high performance, incorporate the 3902663 screw to ensure secure fastening of critical engine components.

ISB Series Engines

• ISB CM550
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB4.5 CM2350 B104
• ISBE CM2150
• ISBE CM800
• ISBE4 CM850

The ISB series engines, a cornerstone of Cummins’ lineup, utilize the 3902663 screw in various configurations, ensuring the secure attachment of engine parts across different engine models.

This detailed compatibility overview highlights the extensive use of the 3902663 screw across multiple Cummins engine series, underscoring its importance in maintaining engine integrity and performance.

Role of Part 3902663 Hexagon Flange Head Cap Screw in Engine Systems

The 3902663 Hexagon Flange Head Cap Screw is instrumental in securing various components within engine systems, ensuring their stability and proper function.

In the aftercooler system, this screw is used to fasten the aftercooler to its mounting brackets, ensuring it remains securely in place during operation.

For the alternator and its mounting arrangement, the screw plays a key role in attaching the alternator to the engine block or bracket, facilitating efficient power generation and regulation.

Within the crankcase breather system, the screw is employed to secure the breather housing to the crankcase, allowing for the release of pressure and contaminants from the crankcase while maintaining a sealed environment.

In turbocharger applications, the screw is utilized in the turbocharger arrangement to secure the turbocharger to the engine, ensuring it operates efficiently by compressing the intake air.

The screw is also vital in the air intake manifold, where it secures the manifold to the engine, ensuring a proper seal and efficient airflow into the combustion chambers.

In the lubricating oil system, particularly in the lubricating oil cooler module, the screw is used to attach the cooler to the engine, ensuring effective cooling of the lubricating oil.

For the fuel filter location, the screw secures the fuel filter housing to the engine or frame, ensuring the filter remains in place and functions correctly to remove contaminants from the fuel.

In the thermostat housing, the screw is used to attach the housing to the engine, ensuring the thermostat operates within the correct temperature range for optimal engine performance.

The screw also finds its application in the water inlet connection, securing the water inlet to the engine block, ensuring a proper flow of coolant into the engine for temperature regulation.

Overall, the 3902663 Hexagon Flange Head Cap Screw is a versatile fastener that contributes to the secure attachment and efficient operation of various engine components.

Conclusion

The 3902663 Hexagon Flange Head Cap Screw is a critical component in the maintenance and operation of commercial trucks, particularly within Cummins engines. Its design and features ensure secure fastening of various engine components, contributing to the overall reliability and performance of the truck. Proper installation, regular maintenance, and understanding its role in different engine systems are essential for maximizing the benefits of this part.