4991552
Regular Hexagon Nut
Cummins®

The 4991552 Standard Hexagonal Nut is a component manufactured by Cummins, a well-established name in the automotive and heavy-duty truck industry. This nut is specifically designed for use in commercial trucks, where it plays a role in securing various components and ensuring the structural integrity and functionality of the vehicle.

Basic Concepts of Standard Hexagonal Nuts

A standard hexagonal nut is a type of fastener characterized by its six-sided shape, which allows for easy tightening and loosening using a wrench or socket. In mechanical systems, these nuts serve the general purpose of securing components together by threading onto a bolt or screw. The hexagonal shape provides a firm grip, enabling precise and controlled fastening ¹.

Purpose of the 4991552 Standard Hexagonal Nut in Truck Operation

This Cummins part is integral to the operation and maintenance of commercial trucks. It is used in various application areas where secure fastening is required, such as in the engine compartment, chassis, and other critical assemblies. By providing a reliable connection between components, this nut helps maintain the structural integrity and functionality of the truck, ensuring safe and efficient operation ².

Key Features

The 4991552 boasts several key features that enhance its performance and durability. It is made from high-quality materials, ensuring resistance to corrosion and wear. The thread size is designed to match specific bolts and screws used in commercial trucks, providing a secure and stable connection. Additionally, the nut may feature unique design elements, such as a locking mechanism, to prevent loosening during operation ³.

Benefits

Using the 4991552 offers several benefits. Its high-quality construction improves the reliability of the fastening, reducing the risk of component failure. The nut is easy to install, thanks to its standard hexagonal shape, which allows for straightforward tightening with common tools. Furthermore, its compatibility with other components ensures a seamless integration into the truck’s existing systems ⁴.

Installation and Usage

Proper installation of the 4991552 is crucial for optimal performance. It should be threaded onto the corresponding bolt or screw and tightened to the recommended torque settings provided by the manufacturer. Using the correct tools and following best practices, such as lubricating the threads to reduce friction, will ensure a secure and lasting connection.

Troubleshooting and Maintenance

Common issues with the 4991552, such as loosening or corrosion, can be addressed through regular maintenance. Inspecting the nut for signs of wear or damage and tightening it to the proper torque settings can help prevent these problems. Additionally, applying a corrosion-resistant coating can prolong the service life of the nut, ensuring continued reliable performance.

Cummins: Manufacturer Overview

Cummins is a renowned manufacturer with a long history of producing high-quality automotive components. The company is known for its commitment to innovation and excellence, consistently delivering products that meet the demanding requirements of the commercial truck industry. Cummins’ reputation for quality and reliability makes it a trusted choice for truck manufacturers and fleet operators alike.

Cummins Engine Compatibility with Part 4991552

The Standard Hexagonal Nut, part number 4991552, manufactured by Cummins, is a versatile component that fits into various engine models within the Cummins lineup. This part is designed to provide a secure fastening solution, ensuring the integrity and functionality of the engine’s components. Below is a detailed description of the engines that are compatible with this specific nut.

Compatible Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B5.9 CM2670 B166C
• C GAS PLUS CM556
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127
• ISBE CM2150
• ISBE4 CM850
• ISL9 CM2150 SN
• ISL9.5 CM2880 L138
• L8.9
• QSB3.9 CM2880 B138
• QSB5.9 CM2880 B139
• X12 CM2670 X121B

Grouping of Compatible Engines

The engines listed above can be grouped based on their series and specifications to provide a clearer understanding of where the part 4991552 fits:

ISB Series

• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127

ISL Series

• ISL9 CM2150 SN
• ISL9.5 CM2880 L138

QSB Series

• QSB3.9 CM2880 B138
• QSB5.9 CM2880 B139

ISBE Series

• ISBE CM2150
• ISBE4 CM850

Other Models

• 4B3.9
• 6B5.9
• 6C8.3
• B5.9 CM2670 B166C
• C GAS PLUS CM556
• L8.9
• X12 CM2670 X121B

This grouping helps in understanding the broader application of the part 4991552 across different engine series and models, ensuring that users can identify the correct fit for their specific engine needs.

Part 4991552 Standard Hexagonal Nut Component Usage

The part 4991552 is a versatile component utilized across various engine systems to ensure secure and reliable connections. Its application spans multiple critical areas within engine assemblies, contributing to the overall functionality and durability of the systems it supports.

In the cam follower cover arrangement, the Standard Hexagonal Nut is employed to fasten the cover securely in place. This ensures that the cam followers operate within their designated pathways, maintaining optimal engine performance and longevity.

For the rear clutch compressor system, the nut is integral in securing the compressor to its mounting points. This secure attachment is essential for the efficient compression of refrigerant, which is vital for the cooling system’s effectiveness.

In the water inlet and outlet connections, the Standard Hexagonal Nut plays a key role in maintaining the integrity of the cooling system. By securely fastening the connections, it prevents leaks and ensures consistent water flow, which is crucial for engine temperature regulation.

The fuel pump coupling also benefits from the use of this nut. It ensures that the coupling between the fuel pump and the engine is tight and secure, facilitating the smooth transfer of fuel from the pump to the engine.

In the fan engine arrangement, the nut is used to secure the fan to the engine, ensuring that it operates efficiently to cool the engine components. This is particularly important in high-performance engines where cooling is paramount.

For the fuel pump mounting kit, the Standard Hexagonal Nut is utilized to secure the fuel pump in place. This ensures that the pump remains stable and operates efficiently, providing a consistent fuel supply to the engine.

Lastly, in the fuel rail base spacer and fan pilot tube brace applications, the nut is used to secure these components, ensuring they remain in the correct position and operate as intended. This contributes to the overall stability and performance of the engine system.

Conclusion

The 4991552 Standard Hexagonal Nut is a critical component in the maintenance and operation of commercial trucks. Its high-quality construction, ease of installation, and compatibility with various engine models make it an essential part for ensuring the structural integrity and functionality of truck engines. Regular maintenance and proper installation are key to maximizing the performance and longevity of this nut.