3974670
Lock Washer
Cummins®

The Cummins 3974670 Lock Washer is a specialized component designed for use in commercial truck applications. Its purpose is to enhance the security of bolted connections, ensuring that fasteners remain tight under various operating conditions. This washer is significant in maintaining the integrity and safety of truck components, contributing to the overall reliability and performance of commercial vehicles ¹.

Basic Concepts of Lock Washers

Lock washers are designed to prevent fastened joints from loosening due to vibration or other dynamic forces. Unlike regular washers, which primarily distribute load and protect surfaces, lock washers incorporate features such as toothed edges or split designs that bite into the mating surfaces. This action creates friction and resistance, which helps to keep the fastener in place ².

Purpose of the Cummins 3974670 Lock Washer

The Cummins 3974670 Lock Washer plays a role in securing bolted connections in commercial trucks. It is applied in various truck components where vibration and dynamic loads are common, such as in the engine, transmission, and chassis systems. By preventing fasteners from loosening, it helps maintain the structural integrity and operational safety of these components ³.

Key Features

The Cummins 3974670 Lock Washer is characterized by its unique design, which includes serrated edges that grip the mating surfaces. It is made from high-strength materials to withstand the rigors of commercial truck environments. These features contribute to its effectiveness in providing secure fastening solutions ⁴.

Benefits of Using the Cummins 3974670 Lock Washer

Using the Cummins 3974670 Lock Washer offers several advantages. It enhances fastening security by preventing loosening due to vibration. Its design also provides resistance to dynamic loads, ensuring durability in harsh conditions. Additionally, the washer contributes to the longevity of fastened joints, reducing the need for frequent maintenance ⁵.

Installation Guidelines

To install the Cummins 3974670 Lock Washer, first, ensure the mating surfaces are clean and free of debris. Place the lock washer under the bolt head or nut, ensuring the serrated edges are in contact with the surfaces. Tighten the fastener to the manufacturer’s specified torque, taking care not to over-tighten, which could damage the washer or the surfaces ⁶.

Common Applications

The Cummins 3974670 Lock Washer is commonly used in various components of commercial trucks. It is typically found in engine mounts, transmission housings, and chassis components where secure fastening is critical. Its application extends to any area where vibration or dynamic loads could cause fasteners to loosen ⁷.

Troubleshooting and Maintenance

Common issues with lock washers include wear or deformation, which can reduce their effectiveness. Regular inspection for signs of wear, such as smoothing of the serrated edges, is recommended. Maintenance involves replacing worn washers and ensuring that fasteners are properly torqued. Monitoring for loose fasteners can help identify potential problems early ⁸.

Comparison with Other Lock Washers

The Cummins 3974670 Lock Washer differs from other types of lock washers in its design and material strength. While some lock washers may use spring action or helical shapes, the Cummins washer relies on serrated edges for its locking mechanism. This design choice offers a balance of security and ease of installation, making it suitable for heavy-duty applications ⁹.

Manufacturer Information - Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a strong reputation in the automotive industry, Cummins is known for its commitment to quality and innovation. The company’s focus on durability and performance is evident in its commercial truck components, including the Cummins 3974670 Lock Washer ¹⁰.

Compatibility with Various Engine Models

The Lock Washer part number 3974670, manufactured by Cummins, is designed to ensure secure fastening in various engine applications. This part is integral in maintaining the integrity of bolted connections, preventing loosening due to vibration or movement.

Cummins 6B5.9 and 6C8.3 Engines

In the Cummins 6B5.9 and 6C8.3 engines, the Lock Washer 3974670 is utilized in several critical areas where secure fastening is paramount. These engines, known for their robust performance, benefit from the added security provided by this lock washer in applications such as:

• Turbocharger Mounting: Ensuring the turbocharger remains firmly attached to its housing.
• Exhaust Manifold Bolts: Preventing the manifold from loosening, which could lead to exhaust leaks.
• Oil Pan Fasteners: Maintaining a tight seal to prevent oil leaks.

Cummins K19 and K38 Engines

The Lock Washer 3974670 also finds extensive use in the Cummins K19 and K38 engines. These engines, designed for heavy-duty applications, require reliable fastening solutions to withstand the rigors of demanding environments. The lock washer is particularly beneficial in:

• Cylinder Head Bolts: Ensuring the cylinder heads are securely fastened to prevent leaks and maintain compression.
• Intake Manifold Bolts: Keeping the intake manifold tightly sealed to maintain proper air flow and fuel efficiency.
• Oil Pump Mounting: Securing the oil pump to its housing, which is crucial for maintaining consistent oil pressure.

Cummins K50 Engine

The Cummins K50 engine, known for its durability and efficiency, also incorporates the Lock Washer 3974670 in several key areas. This part is essential in:

• Fuel Injector Mounting: Ensuring the fuel injectors are securely fastened to prevent misalignment and leaks.
• Water Pump Fasteners: Maintaining a tight seal to prevent coolant leaks.
• Alternator Mounting: Keeping the alternator securely attached to its housing, which is critical for consistent power generation.

By using the Lock Washer 3974670 in these applications, Cummins ensures that the engines maintain their performance and reliability, even under the most demanding conditions.

Role of Part 3974670 Lock Washer in Engine Systems

The 3974670 Lock Washer is an essential component in ensuring the stability and integrity of various engine system assemblies. It is utilized in several key areas to prevent loosening of fasteners due to vibration and thermal expansion, which are common in engine environments.

Panel and Rail Assemblies

In panel and rail assemblies, the 3974670 Lock Washer is employed to secure bolts and screws. These assemblies often experience significant vibration, and the lock washer helps maintain the tightness of the fasteners, ensuring that panels and rails remain firmly in place. This is particularly important in maintaining the structural integrity of the engine compartment and protecting internal components from external elements.

Engine Instrument and Wiring Harnesses

For engine instruments and wiring harnesses, the 3974670 Lock Washer plays a significant role in securing sensor mounts and electrical connections. Sensors and wiring harnesses are susceptible to movement due to engine vibrations, which can lead to inaccurate readings or intermittent connections. The lock washer ensures that these components remain securely fastened, providing reliable data and consistent electrical performance.

Radiator and Radiator Mounting

In the radiator and its mounting system, the 3974670 Lock Washer is used to secure the radiator to the engine bay. The radiator experiences thermal expansion and contraction, and without proper fastening, it could shift out of alignment. The lock washer helps to keep the radiator firmly in place, ensuring efficient cooling and preventing potential damage to the engine.

Base Assemblies

Base assemblies, which often support various engine components, utilize the 3974670 Lock Washer to secure bolts that attach the base to the engine frame. This ensures that the base remains stable under the dynamic conditions of engine operation, contributing to the overall reliability of the engine system.

Conclusion

In summary, the 3974670 Lock Washer is a versatile component that enhances the security and reliability of various engine system assemblies by preventing fastener loosening. Its application across panels, rails, engine instruments, wiring harnesses, radiators, and base assemblies underscores its importance in maintaining the performance and durability of engine systems.