3974667
Lock Washer
Cummins®

The Cummins 3974667 Lock Washer is a specialized component designed for use in commercial trucks. Its primary purpose is to enhance the security of fastenings, ensuring that bolts and nuts remain tightly secured under various operating conditions. This part is particularly relevant in the demanding environments typical of commercial trucking, where vibrations and dynamic loads can lead to fastenings becoming loose over time ².

Basic Concepts of Lock Washers

Lock washers are mechanical devices used in fastening systems to prevent the loosening of bolts and nuts. They achieve this by introducing tension or deformation that resists the rotational forces that could otherwise cause a fastener to unscrew. There are several types of lock washers, including split lock washers, which have a gap that creates tension when the washer is compressed, and serrated lock washers, which dig into the mating surfaces to provide additional resistance to movement ³.

Purpose of the Cummins 3974667 Lock Washer

The Cummins 3974667 Lock Washer plays a specific role in the operation and maintenance of commercial trucks by ensuring that critical fastenings remain secure. It is typically used in applications where vibrations and dynamic loads are common, such as in the engine compartment, suspension systems, and other areas subject to significant stress. The function of this lock washer is to provide additional resistance to loosening, thereby enhancing the overall reliability and safety of the truck ¹.

Key Features

The Cummins 3974667 Lock Washer is characterized by several key features that enhance its performance and durability. It is made from high-strength materials, ensuring it can withstand the rigors of commercial truck operations. The design includes specific serrations or splits that create the necessary tension to resist loosening. Additionally, the washer is engineered to be compatible with a range of bolt and nut sizes, making it a versatile component in various applications ⁴.

Benefits

Using the Cummins 3974667 Lock Washer offers several benefits. It provides improved fastening security by preventing bolts and nuts from loosening due to vibrations and dynamic loads. This enhanced security contributes to the longevity of the fastening system, reducing the need for frequent maintenance. Additionally, the lock washer’s design allows it to perform well in harsh operating conditions, ensuring reliable operation over the truck’s lifespan ².

Installation Guidelines

Proper installation of the Cummins 3974667 Lock Washer is crucial for its effective function. To install, place the lock washer under the nut or bolt head, ensuring it is correctly aligned with the fastener. Tighten the nut or bolt to the manufacturer’s specified torque settings to ensure the lock washer exerts the proper tension. Avoid over-tightening, as this can damage the washer or the mating surfaces. Regularly inspect the lock washer for signs of wear or deformation, and replace it if necessary to maintain optimal performance ³.

Troubleshooting and Maintenance

Common issues with lock washers include deformation, corrosion, and wear. To troubleshoot, inspect the washer for any visible damage or signs of failure. If the lock washer appears worn or damaged, it should be replaced to ensure the fastening remains secure. Regular maintenance involves checking the tightness of the fastenings and ensuring the lock washer is functioning as intended. In environments with high corrosion, consider using lock washers made from corrosion-resistant materials to extend their lifespan ¹.

Compatibility and Usage

The Cummins 3974667 Lock Washer is designed for use in various commercial truck systems where secure fastenings are critical. It is compatible with a range of bolt and nut sizes, making it suitable for multiple applications within the truck. Typical uses include engine components, suspension systems, and other areas where vibrations and dynamic loads are present ⁴.

About Cummins

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 strong reputation for quality, reliability, and innovation in the commercial truck industry. The company’s extensive product range includes engines, powertrains, and aftermarket parts, all designed to meet the demanding requirements of commercial trucking operations ².

Lock Washer 3974667 Compatibility with Cummins Engines

The Lock Washer part number 3974667, manufactured by Cummins, is a crucial component designed to ensure secure fastening in various engine applications. This part is engineered to provide stability and prevent loosening of bolts and screws, which is essential for maintaining the integrity and performance of the engines ³.

Compatibility with Specific Engine Models

• 6B5.9 and 6C8.3 Engines The Lock Washer 3974667 is compatible with the 6B5.9 and 6C8.3 engines. These engines benefit from the washer’s ability to maintain the tightness of critical fasteners, ensuring that components remain securely in place under operational stresses.

• K19, K38, and K50 Engines The K19, K38, and K50 engines also utilize the Lock Washer 3974667. This part is integral in these engines, providing the necessary security for fasteners that are subject to vibration and movement during operation.

• QSK60 CM500 and QSK78 CM500 Engines For the QSK60 CM500 and QSK78 CM500 engines, the Lock Washer 3974667 is essential in maintaining the integrity of bolted connections. Its use in these engines ensures that components such as manifolds, brackets, and other critical parts remain fastened securely, contributing to the overall reliability and performance of the engine.

• QSK60 CM850 MCRS Engine The QSK60 CM850 MCRS engine also incorporates the Lock Washer 3974667. This part is vital in this engine model, providing the necessary security for fasteners that are critical to the engine’s operation and longevity.

Role of Part 3974667 Lock Washer in Engine Systems

In the intricate assembly of engine systems, the part 3974667 Lock Washer assumes a significant role in ensuring the stability and integrity of various components. This small yet vital component is employed in several key areas:

• Panel Assembly: The Lock Washer is utilized in the fastening of panels to the engine frame. It prevents loosening of bolts due to vibrations, thereby maintaining the structural integrity of the panel.

• Engine Instrument Mounting: When securing engine instruments, the Lock Washer is placed between the bolt head and the instrument housing. This prevents the bolts from loosening over time, ensuring that the instruments remain accurately positioned and functional.

• Rail Attachments: In the attachment of rails to the engine block, the Lock Washer is critical. It ensures that the rails, which may support various engine components or piping, remain firmly in place despite the dynamic environment of the engine.

• Base Plates: For base plates that support heavy or vibrating components, the Lock Washer is employed to maintain a tight and secure fit. This is particularly important for components that experience significant stress or movement.

• Sensor Installations: Sensors that monitor various engine parameters are often subjected to high vibrations. The Lock Washer helps in keeping the sensor bolts tight, ensuring consistent and accurate readings.

• Coolant Level Monitoring: In systems where coolant levels are monitored, the Lock Washer is used in the attachment of coolant level sensors. This ensures that the sensor remains in the correct position, providing reliable coolant level data ⁴.

Conclusion

The Cummins 3974667 Lock Washer is a vital component in the maintenance and operation of commercial trucks and Cummins engines. Its design and features ensure that critical fastenings remain secure under demanding conditions, contributing to the overall reliability and safety of the vehicle. Proper installation, regular maintenance, and understanding its compatibility with various engine models are essential for maximizing the benefits of this part.