3923674
Regular Hexagon Jam Nut
Cummins®

Introduction

The Cummins 3923674 Regular Hexagon Jam Nut is a specialized fastener designed for use in commercial trucks. Its primary function is to secure various components and assemblies within the truck’s systems, ensuring stability and reliability under operational conditions. This part is integral to maintaining the structural integrity and performance of commercial vehicles.

Basic Concepts of Regular Hexagon Jam Nuts

A regular hexagon jam nut is a type of lock nut characterized by its hexagonal shape, which allows for efficient tightening and loosening using standard tools. The design of the jam nut includes a slightly deformed thread that, when tightened against a standard nut, creates friction and prevents loosening due to vibration or other dynamic forces. This mechanism is particularly useful in applications where components are subject to frequent movement or stress ¹.

Purpose and Role in Truck Operation

The Cummins 3923674 Regular Hexagon Jam Nut plays a significant role in the operation and maintenance of commercial trucks by securing critical components and assemblies. It is commonly used in applications where vibration resistance is necessary, such as in engine mounts, transmission components, and chassis assemblies. By providing a secure fastening solution, this jam nut helps maintain the alignment and integrity of these parts, contributing to the overall reliability and safety of the vehicle ².

Key Features

The Cummins 3923674 Regular Hexagon Jam Nut features a hexagonal shape that facilitates easy installation and removal using common hand tools. It is constructed from high-strength materials to withstand the rigors of commercial truck operation. The unique design of the threads, which are slightly deformed, enhances the nut’s ability to resist loosening under vibration. Additionally, the jam nut is designed to be compatible with a wide range of standard bolts and nuts, making it a versatile component in truck maintenance and repair.

Benefits

Using the Cummins 3923674 Regular Hexagon Jam Nut offers several advantages. Its design provides improved security against loosening, which is crucial in dynamic environments like those found in commercial trucks. The resistance to vibration ensures that components remain securely fastened, reducing the risk of failure or damage. Furthermore, the ease of installation allows for quick and efficient maintenance, minimizing downtime for truck operators ³.

Installation Process

Proper installation of the Cummins 3923674 Regular Hexagon Jam Nut involves several steps to ensure optimal performance. Begin by selecting the appropriate bolt and standard nut for the application. Tighten the standard nut to the specified torque using a torque wrench. Then, place the jam nut onto the bolt and tighten it against the standard nut until it creates sufficient friction to prevent loosening. Use a wrench to ensure both nuts are securely fastened. It is important to follow the manufacturer’s guidelines for torque specifications to avoid over-tightening, which can damage threads or components.

Troubleshooting and Maintenance

Common issues with the Cummins 3923674 Regular Hexagon Jam Nut may include loosening due to insufficient tightening or damage to the threads. Regular inspection and maintenance can help identify and address these issues promptly. If loosening is detected, re-tighten the jam nut to the recommended torque specification. In cases of thread damage, replacement of the affected components may be necessary. Routine checks during maintenance intervals can help ensure the continued reliability of the fastening system.

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 commercial truck industry. The company’s extensive product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of commercial vehicle operators. Cummins’ commitment to excellence and customer satisfaction has made it a trusted name in the industry.

Compatibility of Cummins Part 3923674 with Various Engine Models

The Regular Hexagon Jam Nut, identified by the part number 3923674, manufactured by Cummins, is a critical component in ensuring the stability and integrity of various engine systems. This part is designed to fit seamlessly with a range of Cummins engine models, providing a reliable solution for securing and fastening components within the engine assembly.

Compatibility with High-Performance Engines

The Regular Hexagon Jam Nut is engineered to work with several high-performance Cummins engines, including:

• ISBE CM800: This engine is known for its robust performance and reliability, often used in heavy-duty applications. The 3923674 part ensures that the engine’s components remain securely fastened, contributing to the overall durability and efficiency of the engine.
• ISF2.8 CM2220 F129: A mid-range engine that balances power and efficiency, the 3923674 jam nut is essential for maintaining the integrity of the engine’s fastenings, ensuring smooth operation and longevity.
• ISX12 CM2350 X102: This high-output engine is designed for demanding applications. The 3923674 part plays a crucial role in securing various components, helping to maintain the engine’s structural integrity under high stress.

Compatibility with Medium-Duty Engines

The Regular Hexagon Jam Nut is also compatible with medium-duty engines, such as:

• QSB6.7 M CM2250: This engine is known for its balance of power and efficiency, making it suitable for a variety of applications. The 3923674 part ensures that the engine’s components are securely fastened, contributing to the engine’s overall performance and reliability.

Compatibility with Specialized Engines

For specialized applications, the Regular Hexagon Jam Nut is also suitable for:

• QSK38 CM850 MCRS and QSK50 CM2150 MCRS: These engines are designed for specific, high-demand applications. The 3923674 part ensures that the engine’s components are securely fastened, providing the necessary stability and reliability for these specialized engines.

By ensuring that the Regular Hexagon Jam Nut is compatible with a wide range of Cummins engines, this part plays a vital role in maintaining the structural integrity and performance of these engines across various applications.

Role of Part 3923674 Regular Hexagon Jam Nut in Engine Systems

The part 3923674 Regular Hexagon Jam Nut is instrumental in securing various components within engine systems, ensuring stability and integrity throughout operation.

In the arrangement of engine components, this jam nut is often used to fasten critical parts, maintaining their precise positioning and alignment. This is particularly important in the oil fill and breather systems where consistent and secure connections prevent leaks and ensure efficient operation.

Within the crankcase and crankcase breather systems, the jam nut plays a significant role in securing connections that manage ventilation and pressure relief. Its application here helps maintain the structural integrity of these systems, which is essential for the overall performance and longevity of the engine.

For the gauge and oil level monitoring systems, the jam nut ensures that sensors and gauges are firmly attached, providing accurate readings and reliable data for engine management.

In the injector plumbing and compressor air inlet systems, the jam nut is used to secure fittings and connections, ensuring that fuel and air are delivered consistently and without interruption. This is vital for the engine’s combustion process and overall efficiency.

The rocker lever and rocker lever assembly also benefit from the use of this jam nut. By securing these components, it ensures that the valve train operates smoothly, contributing to the engine’s performance and reliability.

Lastly, in the tube brace applications, the jam nut provides additional support and stability to various engine mounts and braces, enhancing the structural robustness of the engine assembly.

Overall, the part 3923674 Regular Hexagon Jam Nut is a fundamental component in maintaining the secure and efficient operation of various engine systems.

Conclusion

The Cummins 3923674 Regular Hexagon Jam Nut is a critical component in the maintenance and operation of commercial trucks and Cummins engines. Its design and features ensure secure fastening of components, resistance to vibration, and ease of installation, contributing to the overall reliability and performance of the vehicle. Proper installation and maintenance of this part are essential for ensuring the continued stability and integrity of engine systems.