3900227
Hexagon Head Cap Screw
Cummins®

The Cummins 3900227 Hexagon Head Cap Screw is a specialized fastener designed for use in commercial trucks. It serves to secure various components within the truck’s mechanical assemblies, ensuring stability and reliability under demanding operational conditions. This screw is integral to maintaining the structural integrity and performance of commercial trucks, facilitating efficient and safe 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 easy tightening and loosening using a wrench or socket. These screws are commonly used in mechanical assemblies to secure components together. They function by creating a strong, stable connection that can withstand significant stress and vibration, which is particularly important in heavy-duty applications like commercial trucks ¹.

Purpose of the Cummins 3900227 Hexagon Head Cap Screw

The Cummins 3900227 Hexagon Head Cap Screw plays a specific role in the operation and maintenance of commercial trucks. It is utilized in various application areas within truck mechanics, including but not limited to, securing engine components, transmission parts, and chassis elements. Its design ensures that critical components remain firmly in place, contributing to the overall reliability and performance of the truck.

Key Features

The Cummins 3900227 Hexagon Head Cap Screw boasts several key characteristics that enhance its functionality. It is typically made from high-strength materials, such as alloy steel, to provide durability and resistance to wear. The screw features a specific thread type that ensures a secure fit, and it may include unique design elements like a countersunk head for flush mounting or a corrosion-resistant coating to extend its service life in harsh environments ².

Benefits

Using the Cummins 3900227 Hexagon Head Cap Screw offers several advantages. Its high-strength material composition contributes to durability, making it suitable for heavy-duty applications. The screw’s design provides resistance to vibration, which is crucial for maintaining secure connections in dynamic environments. Additionally, the hexagonal head allows for ease of installation and removal, facilitating efficient maintenance procedures.

Installation and Usage Guidelines

Proper installation of the Cummins 3900227 Hexagon Head Cap Screw involves several steps to ensure a secure and lasting connection. Begin by cleaning the mating surfaces to remove any debris or contaminants. Use the appropriate wrench or socket to tighten the screw to the specified torque, which ensures the connection is secure without over-tightening. Recommended tools include a torque wrench for precise application of force ³.

Troubleshooting and Maintenance

Common issues associated with Hexagon Head Cap Screws include loosening due to vibration and corrosion. To identify and resolve these issues, regularly inspect the screws for signs of wear or damage. If corrosion is present, consider replacing the screw with a corrosion-resistant variant. Maintenance tips to ensure longevity and optimal performance include periodic tightening to the specified torque and protecting the screw from environmental factors that may accelerate wear.

Safety Considerations

When working with Hexagon Head Cap Screws, it is important to observe several safety practices. Proper handling involves using the correct tools to avoid damage to the screw or surrounding components. Store screws in a dry, organized environment to prevent corrosion and misplacement. Disposal methods should comply with local regulations to ensure environmental 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 itself as a trusted name in the commercial truck industry. The company is committed to quality and innovation, continuously developing advanced components that enhance the performance and reliability of commercial trucks.

Hexagon Head Cap Screw 3900227 in Cummins Engines

The Cummins part number 3900227, a Hexagon Head Cap Screw, is a critical component in various Cummins engine models. This screw is integral in securing different parts within the engine assembly, ensuring structural integrity and operational efficiency. Below is a detailed overview of how this part fits into the listed Cummins engines:

4B3.9, 6B5.9, 6C8.3, B3.3, B3.9 G, B4.5, B5.6, B5.9, B5.9 G, B5.9 GAS PLUS CM556, C8.3 G, G5.9, G8.3, GTA8.3 CM558

In these engines, the Hexagon Head Cap Screw 3900227 is commonly used in the following applications:

• Cylinder Head Bolts: Securing the cylinder heads to the engine block, ensuring a tight seal and preventing leaks.
• Valve Cover Fasteners: Attaching valve covers to the engine, protecting internal components and maintaining oil pressure.
• Turbocharger Mounting: Fastening the turbocharger to the engine, ensuring it remains securely in place under high RPMs and varying temperatures.

B5.9 CM2670 B152B, B5.9 CM2670 B166C, B6.7 CM2670 B153B

For these specific models, the screw is utilized in:

• Fuel Injection System: Securing components of the fuel injection system, ensuring precise fuel delivery and engine performance.
• Exhaust Manifold Bolts: Attaching the exhaust manifold to the engine, facilitating efficient exhaust gas flow and reducing back pressure.

ISB (Chrysler), ISB CM550, ISB CM850, ISB3.9 CM2220 B107, ISB5.9 CM2880 B110, ISB5.9 CM2880 B127, ISB5.9 CM2880 B140

In the ISB series engines, the Hexagon Head Cap Screw 3900227 is employed in:

• Engine Block Bolts: Securing the engine block components, maintaining the overall structural integrity of the engine.
• Oil Pan Fasteners: Attaching the oil pan to the engine, ensuring an effective oil containment system.
• Accessory Drive Mounting: Fastening components of the accessory drive system, ensuring proper operation of ancillary systems like the alternator and water pump.

C GAS PLUS CM556, G5.9 CM558, G8.3 CM558

For these gas engines, the screw is used in:

• Gas Manifold Attachment: Securing the gas manifold to the engine, ensuring efficient gas flow and combustion.
• Emission Control System: Fastening components of the emission control system, maintaining compliance with environmental regulations.

The Hexagon Head Cap Screw 3900227 is a versatile and essential component in Cummins engines, providing the necessary strength and reliability for various critical applications.

Role of Part 3900227 Hexagon Head Cap Screw in Engine Systems

The part 3900227 Hexagon Head Cap Screw is instrumental in securing various components within engine systems, ensuring stability and proper function. Its applications span across multiple critical areas:

• Alternator Location and Mounting: This screw is used to secure the alternator in place, ensuring it remains stable during engine operation. It also plays a role in the alternator mounting process, providing the necessary tension to keep the alternator aligned with the engine’s pulley system.

• Camshaft and Cam/Gear Kit: In the camshaft assembly, the Hexagon Head Cap Screw is employed to fasten the cam/gear kit components. This ensures the camshaft rotates smoothly and maintains proper timing with the engine’s crankshaft.

• Connecting Rod and Piston Assembly: Within the connecting rod and piston components, this screw helps in securing the connecting rod to the piston, ensuring a tight and reliable connection that can withstand the high stresses of engine operation.

• Cylinder Block Kit: The screw is utilized in the cylinder block kit to secure various components, such as the cylinder head or ancillary parts, ensuring the structural integrity of the engine block.

• Fuel Injector and Fuel Manifold: In the fuel system, the Hexagon Head Cap Screw is used to mount fuel injectors and secure the fuel manifold, ensuring a leak-free and stable fuel delivery system.

• Injector Plumbing: It plays a role in the injector plumbing by securing fittings and connections, maintaining the integrity of the fuel lines and ensuring consistent fuel pressure.

• Thermostat Housing Plumbing: This screw is crucial in thermostat housing assemblies, where it secures the housing to the engine block, ensuring proper coolant flow and temperature regulation.

• Throttle Kit: In throttle systems, the screw is used to mount the throttle body to the intake manifold, ensuring a secure and leak-free connection.

• Turbocharger Arrangement: For turbocharged engines, the screw is used in the turbocharger arrangement to secure the turbocharger to the engine, ensuring it remains stable under high-pressure conditions.

• Vacuum Pump and Water Pump: It is also utilized in the mounting of vacuum pumps and water pumps, ensuring these components are securely attached to the engine, facilitating their function in maintaining engine vacuum and coolant circulation.

Conclusion

The Cummins 3900227 Hexagon Head Cap Screw is a critical component in the maintenance and operation of commercial trucks and Cummins engines. Its robust design, high-strength material, and versatile applications make it essential for ensuring the stability and reliability of various engine components. Proper installation, regular maintenance, and adherence to safety practices are vital for maximizing the performance and longevity of this part.