3900240
Regular Hexagon Nut
Cummins®

The 3900240 Regular Hexagon Nut, manufactured by Cummins, is a component that holds significance in the realm of commercial truck maintenance and operation. Cummins, a well-established name in the automotive industry, is known for its commitment to quality and innovation. This particular nut is designed to meet the rigorous demands of commercial truck applications, ensuring reliable performance and durability.

Basic Concepts of Regular Hexagon Nuts

A regular hexagon nut is a type of fastener characterized by its six-sided shape. This hexagonal design allows for efficient torque application using standard tools, such as wrenches or sockets, which engage with the flat sides of the nut. The hexagonal shape provides a stable and secure grip, minimizing the risk of slippage during tightening or loosening. This design is particularly advantageous in applications where precise and consistent torque is required ¹.

Purpose of the 3900240 Regular Hexagon Nut in Truck Operation

This Cummins part plays a role in the assembly and maintenance of commercial trucks by securing various components and ensuring structural integrity. It is commonly used in applications such as engine mounts, exhaust systems, and chassis components. Its purpose is to provide a secure and reliable fastening solution that can withstand the vibrations and stresses encountered in truck operation.

Key Features

The 3900240 Regular Hexagon Nut is crafted with attention to detail to enhance its performance and durability. It is typically made from high-strength materials, such as alloy steel, to withstand the demanding conditions of truck applications. The nut features a specific thread type that ensures a proper fit with corresponding bolts or studs. Additionally, unique design elements, such as chamfered edges or locking mechanisms, may be incorporated to improve torque application and prevent loosening ².

Benefits

Using the 3900240 Regular Hexagon Nut offers several benefits in truck operation. Its design allows for efficient torque application, ensuring that components are securely fastened. The hexagonal shape provides a stable grip, reducing the risk of slippage during installation or removal. Furthermore, the nut’s material composition and design contribute to its resistance to loosening, even in harsh operating conditions. This results in enhanced longevity and reliability, minimizing the need for frequent maintenance or replacement ³.

Installation Guidelines

Proper installation of the 3900240 Regular Hexagon Nut is crucial to ensure secure fastening and optimal performance. It is recommended to use the appropriate tools, such as wrenches or sockets, that match the size of the nut. When tightening the nut, apply even and consistent torque to avoid overtightening or under-tightening. It is advisable to follow the manufacturer’s torque specifications for the specific application to achieve the desired level of tightness. Additionally, periodically inspect the nut for any signs of damage or wear and replace it if necessary to maintain reliable fastening.

Troubleshooting and Maintenance

Regular inspection and maintenance of the 3900240 Regular Hexagon Nut are important to ensure continued reliable performance. Common issues associated with regular hexagon nuts include loosening, corrosion, or damage due to excessive torque. To troubleshoot these issues, it is recommended to check for proper torque application, inspect for signs of corrosion or damage, and replace the nut if necessary. Additionally, applying a thread locker or anti-seize compound can help prevent loosening and corrosion, prolonging the life of the nut.

Cummins: A Brief Overview

Cummins Inc. is a renowned manufacturer in the commercial truck industry, known for its commitment to quality and innovation. With a rich history spanning several decades, Cummins has established itself as a trusted provider of automotive components. The company offers a wide range of products, including engines, transmissions, and aftermarket parts, catering to the diverse needs of commercial truck operators. Cummins’ reputation for reliability and performance has made it a preferred choice among truck manufacturers and fleet operators.

Cummins Regular Hexagon Nut 3900240 Compatibility

The Cummins Regular Hexagon Nut part number 3900240 is a versatile component that fits a variety of Cummins engines. This part is designed to meet the stringent requirements of heavy-duty applications, ensuring reliability and durability across different engine models.

Compatible Engines

4B3.9 Series

• 4B3.9

6B5.9 Series

• 6B5.9

6C8.3 Series

• 6C8.3

B4.5 Series

• B4.5

B5.9 Series

• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556

B6.7 Series

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

C Series

• C GAS PLUS CM556

F4.5 Series

• F4.5 CM2620 F139B

ISB Series

• ISB CM550
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB3.9 CM2220 B107
• ISB5.9G CM2180

ISBE Series

• ISBE CM2150
• ISBE CM800
• ISBE4 CM850

ISC Series

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

This part is engineered to provide a secure and stable connection in various engine configurations, ensuring that the engine components remain tightly fastened and operational under demanding conditions.

Role of Part 3900240 Regular Hexagon Nut in Engine Systems

The 3900240 Regular Hexagon Nut is a versatile component utilized across various engine systems to ensure secure and reliable connections. Its applications span multiple critical areas within the engine assembly, contributing to the overall functionality and durability of the engine.

Air Cleaner Mounting

In the air cleaner system, the 3900240 nut is employed to fasten the air cleaner housing to the engine block or intake manifold. This secure attachment ensures that the air cleaner remains in place, providing a consistent and clean air supply to the engine.

Alternator Location

For the alternator, the 3900240 nut is used to mount the alternator to the engine bracket. This secure fitting is essential for maintaining the alternator’s position and ensuring it operates efficiently to generate electricity for the engine’s electrical systems.

Oil Fill and Level Gauge

In the oil fill system, the 3900240 nut is utilized to secure the oil fill cap and the oil level gauge. This ensures that the oil cap remains tightly sealed, preventing oil leaks and maintaining the integrity of the lubrication system.

Cooling System Assembly

Within the cooling system, the 3900240 nut plays a role in attaching components such as the thermostat housing and radiator bracket. These connections are vital for maintaining the structural integrity of the cooling system and ensuring efficient heat dissipation.

Cylinder Block and Engine Brake

The nut is also used in the cylinder block to secure various brackets and supports. Additionally, in engine brake systems, it helps in mounting the exhaust brake and related components, ensuring they function correctly under varying engine loads.

Exhaust Connection and Gauges

For exhaust systems, the 3900240 nut is instrumental in securing exhaust connections and gauges. This includes attaching the exhaust brake and ensuring that all gauges, such as the lubricating oil gauge, are firmly in place for accurate readings.

Governor and Air Compressor

In governor systems, the nut is used to secure the governor housing and related components. Similarly, in air compressor systems, it ensures that the compressor is securely mounted, contributing to stable and efficient operation.

Wiring and Harnesses

The 3900240 nut is also crucial in electrical systems, where it is used to secure wiring harnesses and retainer brackets. This ensures that all electrical connections remain intact and function reliably under engine operation.

Turbocharger and Radiator Bracket

In turbocharger applications, the nut is used to secure the turbocharger to the engine, ensuring it operates within specified parameters. Additionally, it is employed in attaching the radiator bracket, which is essential for the proper functioning of the cooling system.

Front Engine Support and Torque Converter Cooler

For front engine support, the 3900240 nut is used to secure various support brackets, ensuring the engine remains stable. In torque converter cooler systems, it helps in attaching the cooler lines, maintaining efficient transmission cooling.

Fuel Shutoff and Valves

Finally, in fuel systems, the nut is used to secure the fuel shutoff valve and other related components, ensuring that the fuel system operates safely and efficiently.

Conclusion

The 3900240 Regular Hexagon Nut by Cummins is a critical component in the maintenance and operation of commercial trucks. Its robust design, compatibility with various Cummins engines, and versatile applications across engine systems make it an indispensable part for ensuring reliable performance and durability in demanding truck operations.