3918109
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, Part #3918109, manufactured by Cummins, is a specialized fastener designed for use in commercial trucks. This screw is integral to the assembly and maintenance of various truck components, ensuring secure and reliable fastening in demanding environments. Cummins, a renowned name in the commercial truck industry, produces this part with a focus on durability and performance ¹.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt characterized by its hexagonal head and flanged base. The hexagonal head allows for easy tightening and loosening using standard tools, while the flange provides additional surface area to distribute the load and prevent the screw from sinking into the material. In fastening applications, this screw is used to join components securely, often in scenarios where vibration resistance and load distribution are crucial ².

Role in Truck Operation

This Cummins part plays a significant role in the operation and maintenance of commercial trucks. It is commonly used in applications where components need to be fastened securely, such as in engine mounts, chassis assemblies, and other critical areas. The screw’s design ensures that it can withstand the rigors of truck operation, including vibrations and varying loads, thereby contributing to the overall reliability and safety of the vehicle ³.

Key Features

The 3918109 features a hexagonal head that facilitates easy installation and removal using common tools. The flange at the base of the screw provides additional surface area, which helps in distributing the load more evenly and preventing the screw from pulling through the material. Additionally, the screw is made from high-quality materials that offer excellent resistance to corrosion and wear, ensuring longevity in harsh operating conditions ⁴.

Benefits

This part offers several benefits that make it suitable for commercial truck applications. Its design enhances fastening security by providing a stable and reliable connection between components. The flange characteristic improves resistance to vibration, which is particularly important in the dynamic environment of a truck. Furthermore, the ease of installation and removal allows for quick maintenance and repairs, minimizing downtime.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws may include loosening due to vibration, corrosion, or damage from over-tightening. To address these issues, regular inspections should be conducted to ensure that screws are properly tightened and show no signs of corrosion or damage. If corrosion is detected, the affected screws should be replaced to prevent failure. Additionally, using the correct torque specifications during installation can help prevent over-tightening and subsequent damage.

About Cummins

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 offers a wide range of products and services designed to meet the needs of customers in various sectors, including transportation, construction, and agriculture. Cummins’ commitment to excellence and customer satisfaction has made it a trusted name in the industry.

Cummins Engine Compatibility with Part 3918109

The Hexagon Flange Head Cap Screw, part number 3918109, manufactured by Cummins, is a versatile component designed to fit a wide range of Cummins engines. This part is integral in securing various engine components, ensuring the structural integrity and operational efficiency of the engines. Below is a detailed breakdown of the engines with which this part is compatible.

4B3.9, 6B5.9, 6C8.3, B3.9 G, B4.5, B4.5 RGT, B5.6 CM2670 B152B, B5.9 CM2670 B166C, B5.9 G, B5.9 GAS PLUS CM556, B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, B6.7S, C8.3 G, F3.8 CM2620 F137B

These engines, primarily from the B and C series, utilize the 3918109 screw in various applications. The part’s design allows it to be used in securing components such as valve covers, oil pans, and other critical parts that require a robust fastening solution. The screw’s hexagonal flange head provides a secure grip, while its threaded shank ensures a tight fit, preventing loosening under operational stress.

G5.9, G5.9 CM558, G8.3

The G series engines, including the G5.9, G5.9 CM558, and G8.3, also benefit from the use of the 3918109 screw. This part is particularly useful in securing larger engine components, ensuring that the engine’s structural integrity is maintained during operation. The screw’s compatibility with these engines highlights its versatility and reliability in high-stress environments.

ISB (Chrysler), ISB CM2150, ISB CM550, ISB CM850, ISB/ISD4.5 CM2150 B119

The ISB engines, both in their standard and various configurations, are another group where the 3918109 screw is extensively used. These engines, known for their durability and performance, require a reliable fastening solution to maintain their operational integrity. The screw’s design ensures that it can withstand the rigors of engine operation, providing a secure fit for components such as intake manifolds, exhaust systems, and other critical parts.

The compatibility of the 3918109 screw with these engines underscores its importance in the overall maintenance and performance of Cummins engines. Its ability to fit seamlessly into various engine designs highlights its versatility and reliability, making it an essential component for engine assembly and maintenance.

Role of Part 3918109 Hexagon Flange Head Cap Screw in Engine Systems

The 3918109 Hexagon Flange Head Cap Screw is integral to the assembly and securement of various components within engine systems. Its robust design ensures reliable fastening in high-stress areas, contributing to the overall stability and performance of the engine.

Air Crossover Connection

In the air crossover connection, the Hexagon Flange Head Cap Screw secures the connection points, ensuring a tight seal that prevents air leaks. This is vital for maintaining the correct air-fuel ratio, which is essential for optimal combustion efficiency.

Bracket Actuator Mounting

For the bracket actuator mounting, this screw provides the necessary tension to hold the actuator in place. Proper mounting ensures that the actuator functions correctly, which is important for controlling various engine parameters such as valve timing and fuel injection.

Breather and Crankcase Connection

In the breather and crankcase connection, the screw helps in maintaining the integrity of the seal. This is important for managing crankcase pressure and ensuring that contaminants are effectively vented from the engine.

Air Intake and Fuel System Components

Within the air intake manifold and fuel system components, such as the fuel drain tube, fuel plumbing, and fuel pump plumbing, the Hexagon Flange Head Cap Screw plays a role in securing connections and fittings. This ensures that there are no leaks in the air or fuel pathways, which could otherwise lead to inefficient engine operation.

Electronic Control Module Wiring Harness

The screw is also used in securing the electronic control module wiring harness. This ensures that all electrical connections are stable and reliable, which is essential for the proper functioning of the engine control module and fuel control module.

Long Block and Long Block Kit

In the assembly of the long block and long block kit, the Hexagon Flange Head Cap Screw is used to fasten various components together. This includes securing the air intake manifold, fuel pump mounting, and intake connection, ensuring that all parts are correctly aligned and tightly fastened.

Plumbing and Fuel Filter

For the plumbing of the air fuel control, fuel filter, and injector, the screw ensures that all connections are secure. This is important for maintaining the integrity of the fuel delivery system and ensuring consistent fuel pressure and flow.

Sea Water Pump and Ignition System

In the sea water pump and ignition system, the screw is used to secure components that are exposed to high temperatures and pressures. This ensures that all parts remain in place and function correctly, which is essential for the reliable operation of the engine.

Expansion Tank and Turbocharger Location

Finally, in the expansion tank and turbocharger location, the Hexagon Flange Head Cap Screw helps in securing these components. This ensures that the expansion tank maintains its seal and that the turbocharger is correctly mounted, contributing to the overall efficiency and performance of the engine.

Conclusion

The 3918109 Hexagon Flange Head Cap Screw is a critical component in the assembly and maintenance of Cummins engines. Its robust design, ease of use, and compatibility with a wide range of engines make it an indispensable part for ensuring the reliability and performance of commercial trucks. Regular maintenance and proper installation are essential to maximize the benefits of this part and ensure the longevity of the engine components it secures.