3863993
Hexagon Flange Head Cap Screw
Cummins®

The Hexagonal Flange Head Cap Screw, identified by part number 3863993, is a component manufactured by Cummins, a prominent name in the commercial truck industry. This screw is integral to the assembly and maintenance of commercial trucks, ensuring secure fastening in various applications. Cummins, known for its robust and reliable parts, provides this screw as part of its extensive range of truck components.

Basic Concepts

A Hexagonal Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and flange, which provides additional surface area for torque application. This design allows for efficient tightening and loosening using standard tools. In the context of truck mechanics, these screws are used to secure components that require a high degree of fastening security and resistance to vibration ¹.

Purpose and Role in Truck Operation

This Cummins part plays a specific role in the operation and maintenance of commercial trucks. It is utilized in applications where secure fastening is required, such as attaching brackets, panels, and other structural components. Its design ensures that these parts remain firmly in place, even under the dynamic conditions experienced by commercial trucks.

Key Features

The 3863993 features a hexagonal flange head, which provides a larger surface area for tool contact, enhancing the ease of installation and removal. The screw is made from high-quality materials, ensuring durability and resistance to corrosion. Its threading specifications are designed to provide a strong, secure hold, minimizing the risk of loosening over time.

Benefits

The benefits of using this part include enhanced fastening security, resistance to vibration, and ease of installation and removal. The hexagonal flange head design allows for efficient torque application, reducing the likelihood of stripping or damaging the screw head. Additionally, the material composition ensures longevity and performance in demanding truck applications ².

Installation Process

Proper installation of the 3863993 involves several steps. First, ensure that the mating surfaces are clean and free of debris. Use a torque wrench to tighten the screw to the specified torque, which ensures a secure hold without over-tightening. It is also advisable to periodically check the screw for tightness, especially in applications subject to vibration.

Troubleshooting and Maintenance

Common issues with the 3863993 include loosening and corrosion. To address loosening, re-tighten the screw to the specified torque. If corrosion is present, clean the affected area and consider applying a corrosion-resistant coating. Regular inspection and maintenance will help ensure the longevity and performance of the screw.

Cummins Overview

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 reputation for quality and reliability in the commercial truck industry. The company offers a wide range of products, including engines, powertrains, and aftermarket parts, all designed to meet the demanding needs of commercial truck operators.

Cummins Engine Part 3863993: Hexagonal Flange Head Cap Screw

The Cummins part number 3863993, a Hexagonal Flange Head Cap Screw, is a critical component used in various Cummins engine models. This part is designed to provide secure fastening in applications where high strength and durability are essential. The hexagonal flange head design allows for efficient torque application, ensuring that the screw remains tight and secure under operational stresses.

Application in Cummins Engines

4B3.9 and 6B5.9 Engines

The Hexagonal Flange Head Cap Screw (part number 3863993) is commonly used in the 4B3.9 and 6B5.9 engines. These engines are known for their robust construction and reliability in demanding applications. The screw is typically employed in areas requiring high-strength fastening, such as securing engine covers, brackets, and other structural components. Its design ensures that these parts remain firmly attached, even under the intense vibrations and stresses encountered during engine operation.

QSC8.3 CM850 (CM2850) Engines

In the QSC8.3 CM850 (CM2850) engines, the Hexagonal Flange Head Cap Screw (part number 3863993) plays a vital role in maintaining the integrity of the engine assembly. This engine model is often used in heavy-duty applications, where reliability and performance are paramount. The screw is used in various critical fastening applications, ensuring that components such as engine blocks, cylinder heads, and other structural elements are securely fastened. The flange head design provides a large surface area for torque application, which is essential for maintaining the integrity of these components under high-stress conditions.

Grouping of Engines

The Hexagonal Flange Head Cap Screw (part number 3863993) is a versatile component that finds application across multiple Cummins engine models. By grouping the 4B3.9 and 6B5.9 engines together, it is evident that this screw is used in engines that share similar design philosophies and operational requirements. Similarly, the QSC8.3 CM850 (CM2850) engine, while distinct in its specifications, also benefits from the reliable fastening provided by this screw. The commonality in the use of this part across these engines underscores its importance in ensuring the structural integrity and performance of Cummins engines.

Role of Part 3863993 Hexagonal Flange Head Cap Screw in Engine Systems

The 3863993 is integral to the assembly and functionality of various engine components. Its design allows for secure fastening, ensuring that parts remain firmly in place under the dynamic conditions of engine operation.

Cover Assembly

In the cover assembly, the Hexagonal Flange Head Cap Screw is used to fasten the cover to the engine block. This secure attachment is essential for maintaining the integrity of the engine’s sealed environment, preventing leaks and ensuring that internal components are protected from external contaminants.

Front Gear Attachment

When attaching the front gear to the engine, the Hexagonal Flange Head Cap Screw provides a robust connection. This is particularly important as the front gear is subject to significant rotational forces and must be held securely to prevent misalignment or damage.

Fuel Shut-Off Valve Mounting

The fuel shut-off valve is a critical component for controlling the flow of fuel to the engine. The Hexagonal Flange Head Cap Screw is employed to mount this valve securely, ensuring that it operates efficiently and reliably. Proper mounting is essential for the valve’s function, as any movement or instability could lead to improper fuel delivery.

Gear Cover Securing

The gear cover protects the internal gearing system from debris and ensures that lubricants remain contained. The Hexagonal Flange Head Cap Screw plays a key role in securing the gear cover in place, providing a tight seal and safeguarding the gears from external elements.

Valve Assembly

In valve assemblies, the Hexagonal Flange Head Cap Screw is used to fasten various components together, ensuring that the valve operates smoothly and consistently. This secure fastening helps maintain the precise alignment needed for optimal valve function.

Fuel Shutoff Mechanism

The fuel shutoff mechanism requires secure fastening to ensure it can be reliably engaged and disengaged. The Hexagonal Flange Head Cap Screw is utilized in this application to provide the necessary stability and security, contributing to the overall safety and performance of the engine system.

Conclusion

The 3863993 Hexagonal Flange Head Cap Screw is a vital component in the assembly and maintenance of Cummins engines and commercial trucks. Its design ensures secure fastening, resistance to vibration, and ease of installation and removal. Proper use and maintenance of this part contribute to the overall reliability and performance of the engine systems in which it is employed.