3820988
Hexagon Head Cap Screw
Cummins®

The Cummins 3820988 Hexagon Head Cap Screw is a specialized fastener designed for use in heavy-duty trucks. Manufactured by Cummins Inc., a leader in the diesel engine and power generation industries, this screw plays a significant role in ensuring the structural integrity and operational efficiency of various truck components.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a type of bolt characterized by its hexagonal head, which allows for easy tightening and loosening using standard hexagonal tools such as wrenches or sockets. In the automotive industry, these screws are commonly used for their strength and reliability in fastening metal components together. Mechanically, the hexagonal head provides a larger surface area for tool engagement, reducing the risk of cam-out and ensuring more consistent torque application ¹.

Purpose of the Cummins 3820988 Hexagon Head Cap Screw

This Cummins part is specifically designed to meet the demanding requirements of heavy-duty truck applications. It is used in various truck components where secure and durable fastening is required. This includes applications in the engine, transmission, and chassis, where the screw helps maintain the alignment and integrity of critical parts under significant stress and vibration.

Key Features

The Cummins 3820988 Hexagon Head Cap Screw boasts several key features that enhance its functionality and durability. It is typically made from high-strength steel, ensuring it can withstand the rigors of heavy-duty use. The screw features a coarse thread, which provides greater holding power in soft materials, and a fine thread for applications requiring precise adjustments. The hexagonal head design allows for efficient torque application and reduces the likelihood of stripping during installation or removal.

Benefits

Using the Cummins 3820988 Hexagon Head Cap Screw offers several benefits. Its design enhances fastening security, making it less prone to loosening over time compared to other fasteners. The compatibility with standard hexagonal tools simplifies installation and maintenance procedures. Additionally, the screw’s material composition and thread design contribute to its durability, ensuring long-term performance in demanding environments.

Installation and Usage

Proper installation of this part is crucial for ensuring its effectiveness and longevity. It is recommended to use a torque wrench to apply the specified torque, which ensures the screw is tightened to the manufacturer’s recommendations without over-tightening. Using the correct size hexagonal wrench or socket is also important to avoid damaging the screw head. Lubricating the threads with a suitable lubricant can facilitate easier installation and help prevent seizing.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening due to vibration, corrosion, and damage to the screw head. Regular inspection and maintenance can help identify and address these issues early. If a screw shows signs of loosening, it should be re-tightened to the specified torque. In cases of corrosion, the affected area should be cleaned, and a corrosion-resistant lubricant applied. Damaged screw heads may require replacement to ensure secure fastening.

Safety Considerations

When handling and installing the Cummins 3820988 Hexagon Head Cap Screw, it is important to follow safety practices to prevent injury and ensure proper installation. Wearing personal protective equipment, such as gloves and safety glasses, can protect against potential hazards. Using the correct tools and following torque specifications helps prevent damage to the screw and the components being fastened. Additionally, working in a well-ventilated area and avoiding contact with hazardous materials is recommended.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emission solutions. With a history spanning over a century, Cummins has established a strong reputation for quality, reliability, and innovation in the heavy-duty truck industry. The company’s commitment to excellence is reflected in its products, which are designed to meet the rigorous demands of commercial and industrial applications ².

Hexagon Head Cap Screw 3820988 in Cummins Engines

The Hexagon Head Cap Screw part number 3820988 is a crucial component in several Cummins engine models. This part is integral to the assembly and maintenance of these engines, ensuring secure fastening and structural integrity.

ISM Series Engines

• ISM CM570
• ISM CM570/870
• ISM CM876
• ISM11 CM876 SN

The ISM series engines, including the ISM CM570, ISM CM570/870, ISM CM876, and ISM11 CM876 SN, utilize the Hexagon Head Cap Screw 3820988 in several key areas. This screw is often used for securing various engine components, ensuring that parts remain tightly fastened during operation. Its use in these engines highlights its importance in maintaining the structural integrity and operational efficiency of the ISM series.

L10 Series Engines

• L10 CELECT
• L10 GAS
• L10 MECHANICAL

In the L10 series engines, which include the L10 CELECT, L10 GAS, and L10 MECHANICAL variants, the Hexagon Head Cap Screw 3820988 is employed in similar capacities. This screw is essential for fastening components that require a high level of precision and durability, ensuring that the engine operates smoothly and reliably.

M11 Series Engines

• M11 CELECT
• M11 CELECT PLUS
• M11 MECHANICAL

The M11 series engines, comprising the M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL models, also depend on the Hexagon Head Cap Screw 3820988. This screw is used in various applications within these engines, providing the necessary fastening strength and stability. Its role in these engines is critical for maintaining the overall performance and longevity of the engine components.

QSM11 Series Engines

• QSM11 CM570
• QSM11 CM876

The QSM11 series engines, including the QSM11 CM570 and QSM11 CM876, incorporate the Hexagon Head Cap Screw 3820988 in their design. This screw is utilized in several areas of these engines, ensuring that components are securely fastened and that the engine operates efficiently. Its use in these models underscores its importance in the assembly and maintenance of the QSM11 series.

QST30 Series Engine

• QST30 CM552

The QST30 CM552 engine also relies on the Hexagon Head Cap Screw 3820988. This screw is used in various applications within the engine, providing the necessary fastening and stability. Its inclusion in this engine model highlights its versatility and importance in ensuring the engine’s operational integrity.

Role of Part 3820988 Hexagon Head Cap Screw in Engine Systems

The Part 3820988 Hexagon Head Cap Screw is instrumental in securing various components within engine systems, ensuring stability and proper function. Its applications span across multiple subsystems, each requiring precise fastening to maintain operational integrity.

Turbocharger and Exhaust Connection

In turbocharger systems, the Hexagon Head Cap Screw is used to secure the turbocharger to its bracket, ensuring it remains firmly in place despite the high rotational speeds and temperatures. Additionally, it plays a role in fastening the exhaust connection to the turbocharger housing, maintaining a sealed and efficient flow of exhaust gases.

Fuel System Components

Within the fuel system, this screw is employed in the mounting of the fuel control module and the fuel pump. It ensures that these components are securely attached to their respective housings, preventing any movement that could disrupt fuel delivery or cause leaks.

Cooling System

For the cooling system, the Hexagon Head Cap Screw is utilized in the mounting of the thermostat housing and the water pump. This secure attachment is vital for maintaining the structural integrity of the cooling system, ensuring consistent coolant flow and temperature regulation.

Air Cleaner and Alternator

In the air intake system, the screw is used for mounting the air cleaner, securing it in place to prevent any displacement that could affect air flow into the engine. Similarly, in the electrical system, it is crucial for mounting the alternator, ensuring it remains stable during operation to generate electricity efficiently.

Auxiliary Systems

The screw also finds its use in auxiliary systems such as the auxiliary cooling system and the hydraulic pump. It is instrumental in securing components like the PRS regulator and the hydraulic pump to their mounting brackets, ensuring these systems operate without interference.

Safety and Protection

Beyond its fastening roles, the Hexagon Head Cap Screw is also used in the installation of shields—such as debris and heat shields—around various engine components. This application is essential for protecting sensitive parts from damage and excessive heat, contributing to the overall durability and safety of the engine system.

Conclusion

In summary, the Part 3820988 Hexagon Head Cap Screw is a versatile fastener that plays a significant role in the secure and efficient operation of numerous engine components. Its applications across different systems highlight its importance in maintaining the structural and functional integrity of engine assemblies.