3979420
Regular Hexagon Nut
Cummins®

The 3979420 Regular Hexagon Nut, manufactured by Cummins, is a critical component in the maintenance and operation of commercial trucks. Cummins, a renowned name in the commercial truck industry, produces a range of parts designed to enhance the performance and reliability of truck systems. This part plays a significant role in various fastening applications within truck assemblies.

Basic Concepts of Regular Hexagon Nuts

A regular hexagon nut is a type of fastener characterized by its six-sided shape. This design allows for efficient torque application and resistance to loosening, making it a preferred choice in many mechanical applications. The hexagonal shape provides a larger contact area compared to other nut designs, which enhances grip and reduces the likelihood of the nut rounding off during installation or removal. This shape is particularly advantageous in high-torque applications where secure fastening is paramount ¹.

Purpose of the 3979420 Regular Hexagon Nut in Truck Operation

The 3979420 Regular Hexagon Nut is utilized in the assembly and maintenance of commercial trucks. It is commonly employed in applications where secure and durable fastening is required. This includes, but is not limited to, engine components, chassis parts, and various other assemblies where vibration and stress are factors. The nut’s design ensures that it remains firmly in place, contributing to the overall integrity and safety of the truck ².

Key Features

The 3979420 Regular Hexagon Nut is crafted from high-quality materials, ensuring durability and performance. Its thread size is designed to meet specific application requirements, providing a secure fit that resists loosening over time. Additionally, the nut may feature special coatings or treatments that enhance its resistance to corrosion and wear, further extending its service life in demanding environments ³.

Benefits

Using the 3979420 Regular Hexagon Nut offers several advantages. Its design allows for improved torque application, ensuring that components are securely fastened. The nut’s resistance to loosening helps maintain the integrity of assemblies over time, even in harsh operating conditions. Furthermore, its longevity reduces the need for frequent replacements, contributing to lower maintenance costs and increased operational efficiency.

Installation Guidelines

Proper installation of the 3979420 Regular Hexagon Nut is key to ensuring a secure fit. It is recommended to use the appropriate tools, such as a torque wrench, to apply the correct amount of torque during installation. This helps prevent over-tightening, which can damage the nut or the components being fastened. Following manufacturer guidelines for torque specifications ensures optimal performance and longevity of the nut.

Troubleshooting and Maintenance

Regular inspection of the 3979420 Regular Hexagon Nut can help identify potential issues before they become problematic. Common issues may include loosening due to vibration or corrosion. Addressing these issues promptly by re-tightening the nut or applying a corrosion-resistant coating can help prolong its life and ensure ongoing performance. Regular maintenance practices, such as cleaning and inspecting the nut and its mating surfaces, are also recommended.

Cummins: Manufacturer Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions. With a history spanning over a century, Cummins has established a reputation for quality, innovation, and reliability in the commercial truck industry. The company’s commitment to excellence is reflected in its product range, which includes engines, filtration systems, and aftermarket parts designed to enhance the performance and longevity of commercial vehicles.

Cummins Regular Hexagon Nut 3979420 Compatibility

The Cummins Regular Hexagon Nut part number 3979420 is designed to fit a variety of Cummins engines, ensuring a secure and reliable connection in various applications. This part is engineered to meet the stringent quality standards set by Cummins, providing durability and performance across multiple engine models.

Compatible Engines

• B5.9 GAS PLUS CM556
• C GAS PLUS CM556
• ISB5.9G CM2180
• ISB6.7 G CM2180 B118
• ISC CM554
• ISL CM554
• ISL G CM2180
• ISX12 G CM2180 EJ
• L GAS PLUS CM556
• QSB3.9 30 CM550
• QSB5.9 30 CM550
• QSC8.3 CM554
• QSL9 CM554
• QSM11 CM570

Grouping of Compatible Engines

The Regular Hexagon Nut 3979420 is compatible with several engine families, each designed for different applications and performance requirements. Here’s a breakdown of the groupings:

CM556 Series

• B5.9 GAS PLUS CM556
• C GAS PLUS CM556
• L GAS PLUS CM556

CM2180 Series

• ISB5.9G CM2180
• ISB6.7 G CM2180 B118
• ISL G CM2180
• ISX12 G CM2180 EJ

CM554 Series

• ISC CM554
• ISL CM554
• QSC8.3 CM554
• QSL9 CM554

CM550 Series

• QSB3.9 30 CM550
• QSB5.9 30 CM550

CM570 Series

• QSM11 CM570

This comprehensive compatibility ensures that the Regular Hexagon Nut 3979420 can be used across a wide range of Cummins engines, providing a versatile solution for maintenance and repair needs.

Role of Part 3979420 Regular Hexagon Nut in Engine Systems

The Part 3979420 Regular Hexagon Nut is instrumental in securing various components within engine systems, ensuring stability and proper function.

Securing Accessories

In engine systems, accessories such as alternators, power steering pumps, and air conditioning compressors require robust mounting. The Regular Hexagon Nut is used to fasten these accessories to the engine block or mounting brackets, providing the necessary torque to withstand operational vibrations and stresses.

Wiring and Harnesses

The integrity of wiring and harnesses is paramount for the electrical systems within an engine. The Regular Hexagon Nut plays a significant role in securing wiring harnesses, particularly those associated with the Electronic Control Module (ECM). By tightening connections at junction points, it ensures that electrical signals are transmitted without interference, reducing the risk of loose connections that could lead to system failures.

Electronic Control Module Wiring Harness

The ECM wiring harness is a complex network that requires precise mounting. The Regular Hexagon Nut is employed to secure this harness to the engine bay, ensuring that all connections remain intact. This is especially important for maintaining the ECM’s ability to monitor and control engine functions accurately.

Valve and Fuel Shutoff Mechanisms

In fuel systems, the Regular Hexagon Nut is utilized in the assembly of valves and fuel shutoff mechanisms. It ensures that these components are tightly secured, preventing leaks and ensuring that the fuel delivery system operates efficiently. Proper securing of these parts is essential for maintaining fuel pressure and ensuring consistent engine performance.

General Application

Across various engine components, the Regular Hexagon Nut serves as a reliable fastener. Whether it’s securing a valve cover, attaching a sensor, or fastening a fuel line, its role is to provide a strong, corrosion-resistant connection that can endure the harsh environment of an engine compartment.

Conclusion

The 3979420 Regular Hexagon Nut is a vital component in the maintenance and operation of commercial trucks. Its design and features ensure secure fastening in various applications, contributing to the overall integrity and safety of the truck. Proper installation and maintenance of this part are essential for optimal performance and longevity.