3901937
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Cummins 3901937 Hexagon Flange Head Cap Screw is a specialized fastener designed for heavy-duty truck applications. Its purpose is to provide secure and reliable fastening in various truck components, ensuring the integrity and performance of the vehicle. This screw is significant in maintaining the structural and functional aspects of heavy-duty trucks, contributing to their durability and efficiency ¹.

Basic Concepts of Hexagon Flange Head Cap Screws

A Hexagon Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and flanged base. The hexagonal head allows for easy tightening and loosening using a wrench or socket, while the flange provides additional surface area for distribution of clamping force, reducing the risk of the screw pulling through the material. This design is particularly effective in applications requiring high torque and resistance to loosening ².

Role of the 3901937 Hexagon Flange Head Cap Screw in Truck Operation

The 3901937 Hexagon Flange Head Cap Screw plays a role in the operation and maintenance of heavy-duty trucks by securing various components. It is commonly used in applications such as engine mounts, transmission housings, and chassis assemblies. By providing a secure fastening solution, it helps maintain the alignment and integrity of these critical components, ensuring the truck operates efficiently and safely ³.

Key Features

The 3901937 Hexagon Flange Head Cap Screw features a hexagonal head design that facilitates easy and precise tightening. The flange at the base of the screw enhances the distribution of clamping force, reducing the likelihood of the screw pulling through the material. Additionally, the screw is made from high-strength materials, ensuring durability and resistance to corrosion in demanding environments.

Benefits

The 3901937 Hexagon Flange Head Cap Screw offers several benefits, including enhanced fastening security due to its hexagonal head and flange design. It provides resistance to loosening, even under vibration and dynamic loads, which is crucial in heavy-duty truck applications. The screw’s durability ensures long-lasting performance, reducing the need for frequent replacements and maintenance.

Installation Guidelines

Proper installation of the 3901937 Hexagon Flange Head Cap Screw involves several steps to ensure optimal performance and longevity. Begin by cleaning the installation surface to remove any debris or contaminants. Use a wrench or socket to tighten the screw to the specified torque, ensuring even and consistent clamping force. It is important to avoid over-tightening, which can damage the screw or the material it is fastening.

Troubleshooting and Maintenance

Common issues with the 3901937 Hexagon Flange Head Cap Screw may include loosening over time or corrosion in harsh environments. To address these issues, regular inspection and maintenance are recommended. If loosening is detected, re-tighten the screw to the specified torque. In cases of corrosion, consider replacing the screw with a new one to ensure continued performance and safety.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a reputation for quality, reliability, and innovation in the automotive and heavy-duty truck industry. The company offers a wide range of products and services designed to meet the needs of customers in various industries, including transportation, construction, and agriculture.

Cummins Engine Compatibility with Part 3901937

The Hexagon Flange Head Cap Screw, part number 3901937, manufactured by Cummins, is a versatile component that fits a variety of Cummins engines. This part is designed to provide a secure fastening solution in various engine applications, ensuring reliable performance and durability.

Engines Compatible with Part 3901937

• 4B3.9
• 6B5.9
• 6C8.3
• B3.3
• B5.9 G
• B6.7 CM2670 B153B
• D4.0 CM2620 D103B
• F3.8 CM2620 F137B
• F4.5 CM2620 F139B
• G8.3
• ISB/ISD4.5 CM2150 B119
• ISB5.9 CM2880 B149
• ISB6.7 G CM2180 B118
• ISBE CM2150
• ISBE CM800
• ISBE4 CM850
• ISL CM554
• ISX CM570
• ISX CM870
• ISX CM871
• L8.9 CM2670 L134C
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117
• QSF2.8 CM2880 F104
• QSF2.8 CM2880 F105

This screw is engineered to meet the stringent requirements of Cummins engines, providing a critical fastening solution in various engine components. Its compatibility across a wide range of engine models underscores its importance in maintaining the integrity and performance of these engines.

Role of Part 3901937 Hexagon Flange Head Cap Screw in Engine Systems

The Part 3901937 Hexagon Flange Head Cap Screw is instrumental in securing various components within engine systems, ensuring their stability and proper function. Its applications span across multiple critical areas:

Crankcase Breather

In the crankcase breather system, the Hexagon Flange Head Cap Screw is used to fasten the breather housing to the crankcase. This secure attachment ensures that the breather system effectively vents pressure and contaminants from the crankcase, maintaining optimal engine performance.

Camshaft and Connecting Rod and Piston

Within the engine’s core, the screw plays a role in attaching components such as the camshaft and connecting rod to the cylinder head and crankshaft, respectively. This secure fastening is essential for the precise timing and smooth operation of the engine’s moving parts.

Cooler and Engine Oil System

In the engine oil cooler and related plumbing, the screw is employed to fasten fittings and connections. This ensures a leak-free system, allowing the engine oil to be efficiently cooled and circulated, which is vital for engine longevity and performance.

Cylinder Head and Engine Heater

The cylinder head, a critical component in the combustion process, often requires secure attachment to the engine block. The Hexagon Flange Head Cap Screw is used here to ensure a tight seal, preventing any gas leakage. Similarly, in engine heater systems, it secures components, ensuring efficient heat distribution within the engine during cold starts.

Fuel Shutoff Valve Kit and Injector Fuel Supply Tube

For fuel systems, the screw is utilized in the fuel shutoff valve kit and injector fuel supply tube assemblies. It ensures that these components are firmly in place, allowing for precise fuel delivery and shutoff, which are essential for engine efficiency and safety.

Manifold and Exhaust System

In the manifold and exhaust systems, the screw is used to secure various components, ensuring that the exhaust gases are efficiently directed away from the engine. This not only improves performance but also reduces emissions.

Plumbing and Turbocharger Systems

The screw is vital in plumbing systems, whether for fuel, refrigerant, or turbocharger coolant. It ensures that all connections are secure, preventing leaks and ensuring the efficient operation of these systems. In turbocharger applications, it secures components, contributing to the turbocharger’s ability to enhance engine performance.

Service and Solenoid Kits

In service and solenoid kits, the screw is used to fasten various components, ensuring that these kits can be effectively installed and function as intended. This is particularly important for maintaining engine performance and facilitating repairs.

Overall, the Part 3901937 Hexagon Flange Head Cap Screw is a versatile fastener that plays a significant role in the assembly and maintenance of various engine systems, contributing to their efficiency, reliability, and performance.

Conclusion

The Cummins 3901937 Hexagon Flange Head Cap Screw is a critical component in the maintenance and operation of heavy-duty trucks and Cummins engines. Its design, featuring a hexagonal head and flanged base, ensures secure fastening and resistance to loosening under dynamic loads. The screw’s compatibility with a wide range of Cummins engines underscores its versatility and importance in maintaining engine integrity and performance. Proper installation and regular maintenance are essential to ensure the longevity and reliability of this part in demanding applications.