3931447
Hexagon Head Cap Screw
Cummins®

The Cummins 3931447 Hexagon Head Cap Screw is a specialized fastener designed for use in commercial trucks. This part is engineered to provide secure and reliable fastening in various truck components, ensuring the integrity and performance of critical assemblies. Its application spans across different parts of the truck, contributing to the overall efficiency and durability of the vehicle.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a type of fastener characterized by its hexagonal head, which allows for efficient tightening and loosening using standard tools such as wrenches or sockets. The screw features external threads that engage with internal threads in a mating part, creating a secure connection. The design of the hexagonal head provides a larger surface area for tool contact, reducing the risk of cam-out and ensuring consistent torque application ¹.

Purpose and Role in Truck Operation

The 3931447 Hexagon Head Cap Screw plays a significant role in the operation and maintenance of commercial trucks. It is used in various truck components, including engine parts, chassis assemblies, and other critical systems. By providing a reliable fastening solution, this screw helps maintain the structural integrity and performance of these components. Its application ensures that parts remain securely attached, reducing the risk of failure or malfunction during operation ².

Key Features

The 3931447 Hexagon Head Cap Screw is crafted from high-quality materials, typically featuring a robust steel composition that offers excellent strength and durability. The screw has a coarse thread type, which provides a strong grip and secure fastening. The hexagonal head design allows for easy installation and removal using standard tools, enhancing efficiency during maintenance procedures. These features contribute to the screw’s functionality and longevity in demanding truck applications.

Benefits

Using the 3931447 Hexagon Head Cap Screw in truck maintenance and repair offers several benefits. Its durable material composition ensures long-lasting performance, even under harsh operating conditions. The reliable fastening provided by the screw helps prevent component loosening, which can lead to safety issues and increased maintenance costs. Additionally, the ease of use with standard tools simplifies installation and removal, making it a practical choice for truck maintenance professionals.

Installation Guidelines

Proper installation of the 3931447 Hexagon Head Cap Screw is crucial for ensuring secure fastening. Begin by cleaning the mating surfaces to remove any debris or corrosion. Use a torque wrench to apply the specified torque, ensuring the screw is tightened to the manufacturer’s recommendations. Avoid over-tightening, as this can damage the screw or the mating part. Regularly inspect the screw for signs of loosening or wear, and re-tighten as necessary to maintain a secure connection ³.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening due to vibration or corrosion. To address these problems, regularly inspect screws for signs of wear or damage. If corrosion is present, clean the affected areas and apply a corrosion-resistant coating to prevent further issues. Replace any screws that show significant wear or damage to ensure continued reliable performance. Proper maintenance practices, such as regular inspections and torque checks, will help prolong the lifespan of the screw and maintain the integrity of the fastened components.

About Cummins

Cummins Inc. is a renowned manufacturer with a long-standing reputation in the commercial truck industry. Founded in 1919, Cummins has a history of innovation and quality in producing engine and power generation equipment. The company is committed to delivering reliable and high-performance components that meet the demanding requirements of commercial truck applications. Cummins’ dedication to quality and customer satisfaction has established it as a trusted name in the industry.

Hexagon Head Cap Screw 3931447 Compatibility with Cummins Engines

The Cummins part number 3931447, a Hexagon Head Cap Screw, is designed to fit a variety of Cummins engines. This screw is integral in securing various components within the engine assembly, ensuring stability and reliability during operation.

ISC Series Engines

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

These engines, part of the ISC series, utilize the Hexagon Head Cap Screw 3931447 in several critical applications. The screw is commonly used in the assembly of engine blocks, cylinder heads, and other structural components, providing the necessary fastening to withstand operational stresses.

ISL Series Engines

• ISL CM2150
• ISL CM554
• ISL G CM2180
• ISL9 CM2150 SN
• ISL9 CM2250

The ISL series engines also incorporate the Hexagon Head Cap Screw 3931447. This screw is essential in securing various parts, including engine mounts, brackets, and other structural elements. Its use ensures that these components remain tightly fastened, contributing to the overall integrity of the engine.

QSB and QSL Series Engines

• QSB5.9 CM850
• QSC8.3 CM554
• QSL8.9 CM2150 L141
• QSL9 CM554
• QSL9 CM850 (CM2850)

The QSB and QSL series engines feature the Hexagon Head Cap Screw 3931447 in their construction. This screw is used in various applications, such as securing engine blocks, cylinder heads, and other critical components. Its design ensures that these parts are held firmly in place, enhancing the durability and performance of the engine.

Other Cummins Engines

• 6B5.9
• 6C8.3
• C GAS PLUS CM556
• C8.3 G
• L8.9

The Hexagon Head Cap Screw 3931447 is also compatible with these additional Cummins engines. It is used in securing various components, ensuring that the engine operates smoothly and efficiently. Its application in these engines highlights its versatility and importance in maintaining engine integrity.

Role of Part 3931447 Hexagon Head Cap Screw in Engine Systems

The part 3931447 Hexagon Head Cap Screw is instrumental in securing and maintaining the integrity of various engine components. Its application spans across multiple areas, ensuring that each part functions as intended under the demanding conditions of engine operation.

Adapter

In the context of adapters, the Hexagon Head Cap Screw is used to fasten the adapter to the engine block or other mating surfaces. This secure attachment is vital for the adapter to perform its role in connecting different components, such as sensors or auxiliary systems, to the engine. The screw ensures that vibrations and thermal expansions do not loosen the connection, maintaining a stable and reliable interface.

Front Drive

For the front drive system, the Hexagon Head Cap Screw is employed to attach the front drive components to the engine or transmission. This includes securing drive plates, gears, and other rotational elements. The screw’s robust design handles the significant torque and rotational forces, ensuring that the front drive remains firmly in place and operates smoothly.

Flexplate

In applications involving the flexplate, the Hexagon Head Cap Screw is used to attach the flexplate to the crankshaft or torque converter. This connection is essential for transmitting power from the engine to the transmission. The screw’s strength and precision threading ensure that the flexplate remains securely attached, even under the high torque and cyclic loading conditions typical in engine operation.

Flywheel

Similarly, when dealing with the flywheel, the Hexagon Head Cap Screw plays a key role in attaching the flywheel to the crankshaft. This secure attachment is necessary for the flywheel to effectively store and release rotational energy, smoothing out the power delivery from the engine. The screw must withstand the considerable forces and vibrations generated during engine operation, ensuring a durable and reliable connection.

Mounting

For engine mounting, the Hexagon Head Cap Screw is utilized to fasten the engine to the vehicle’s frame or subframe. This application is fundamental in maintaining the engine’s position and alignment within the vehicle. The screw’s design ensures that the engine remains securely mounted, absorbing vibrations and minimizing movement, which is essential for both performance and longevity of the engine and its components.

Conclusion

The Cummins 3931447 Hexagon Head Cap Screw is a critical component in the maintenance and operation of commercial trucks. Its robust design, reliable fastening capabilities, and compatibility with various Cummins engines make it an essential part for ensuring the durability and performance of truck components. Proper installation and maintenance of this screw are vital for the continued reliability and efficiency of the vehicle.