3909310
Studded Hexagon Cap Screw
Cummins®

Introduction

The 3909310 Studded Hexagon Cap Screw is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This screw is designed for use in heavy-duty applications, particularly within the framework of commercial trucks. Its robust construction and precise engineering make it suitable for securing various components under demanding operational conditions ¹.

Basic Concepts of Studded Hexagon Cap Screws

A studded hexagon cap screw is a type of fastener characterized by a hexagonal head and a threaded shank that extends beyond the nut it secures. This design allows for efficient torque application using a wrench or socket, ensuring a tight and secure fit. In mechanical applications, these screws play a role in joining components that require high tensile strength and resistance to loosening under vibration or dynamic loads ².

Purpose of the 3909310 Studded Hexagon Cap Screw

The 3909310 Studded Hexagon Cap Screw serves a specific function in the operation of commercial trucks. It is utilized in areas where secure fastening is paramount, such as engine mounts, transmission components, and chassis assemblies. This screw helps maintain the integrity of these critical systems by providing a reliable connection point that can withstand the rigors of heavy-duty use.

Key Features

The 3909310 Studded Hexagon Cap Screw boasts several key features that enhance its performance. Its design includes a hexagonal head for easy torque application, a fully threaded shank for versatile use, and a material composition that offers high tensile strength and corrosion resistance. Additionally, the screw’s threading is precision-cut to ensure a secure fit and optimal load distribution ³.

Benefits

The benefits of using the 3909310 Studded Hexagon Cap Screw include enhanced durability, resistance to vibration, ease of installation, and long-term reliability. Its robust construction allows it to perform well under the stress of heavy-duty applications, while its design features facilitate quick and secure installation. Moreover, the screw’s resistance to corrosion ensures it maintains its integrity over time, contributing to the overall reliability of the truck’s components.

Installation Process

Proper installation of the 3909310 Studded Hexagon Cap Screw involves several steps to ensure secure fastening. Begin by cleaning the mating surfaces to remove any debris or corrosion. Use a torque wrench to apply the recommended torque specification, ensuring the screw is tightened to the manufacturer’s guidelines. It is also advisable to use a thread locker to prevent loosening under vibration. Following these best practices will help achieve a secure and lasting connection.

Troubleshooting Common Issues

Common issues associated with studded hexagon cap screws include loosening, corrosion, or damage. To address loosening, re-torque the screw to the specified value and consider applying a thread locker. Corrosion can be mitigated by using screws made from corrosion-resistant materials and by regularly inspecting and cleaning the fastener. Damage to the screw may require replacement with a new, undamaged part.

Maintenance Tips

Regular maintenance of the 3909310 Studded Hexagon Cap Screw is vital for ensuring continued performance and longevity. Inspect the screw at regular intervals for signs of wear, corrosion, or loosening. Clean the screw and its mating surfaces as needed to prevent buildup that could affect performance. Following these maintenance tips will help maintain the screw’s effectiveness and contribute to the overall reliability of the truck’s components.

Cummins: Manufacturer 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, innovation, and reliability in the commercial truck industry. The company’s extensive product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of heavy-duty applications.

Studded Hexagon Cap Screw (Part 3909310) in Cummins Engines

The Studded Hexagon Cap Screw, identified by the part number 3909310, is a critical component in several Cummins engine models. This part is integral to the assembly and maintenance of these engines, ensuring secure fastening of various parts. Here is a detailed look at how this part fits into the different Cummins engine models:

6B5.9 and 6C8.3 Engines

The 6B5.9 and 6C8.3 engines utilize the 3909310 studded hexagon cap screw for securing components within the engine block and other critical assemblies. This screw is essential for maintaining the structural integrity and alignment of parts during operation.

B5.9 G and B5.9 GAS PLUS CM556 Engines

In the B5.9 G and B5.9 GAS PLUS CM556 engines, the 3909310 screw is used in various applications, including the fastening of engine mounts, brackets, and other structural components. Its design ensures a reliable and secure connection, which is crucial for the engine’s performance and longevity.

G5.9 and G5.9 CM558 Engines

For the G5.9 and G5.9 CM558 engines, this screw is employed in several key areas, such as securing the engine block to the cylinder head and fastening various ancillary components. The robust design of the 3909310 screw helps maintain the alignment and stability of these parts under operational stresses.

ISC CM554 and ISL CM554 Engines

In the ISC CM554 and ISL CM554 engines, the 3909310 studded hexagon cap screw is used to fasten numerous components, including engine mounts, brackets, and other structural elements. Its studded design provides enhanced grip and resistance to loosening, which is vital for the high-performance demands of these engines.

L8.9 and L8.9 L121 Engines

The L8.9 and L8.9 L121 engines also rely on the 3909310 screw for securing various parts within the engine assembly. This includes fastening engine mounts, brackets, and other critical components that require a reliable and secure connection.

L9.3 L105 and L9.5 L117 Engines

In the L9.3 L105 and L9.5 L117 engines, the 3909310 screw is used to fasten several structural components, ensuring the engine’s parts remain securely in place during operation. This screw’s design provides the necessary strength and stability for these engines’ specific requirements.

QSB5.9 CM850, QSC8.3 CM554, QSC8.3 CM850(CM2850), and QSL9 CM554 Engines

The QSB5.9 CM850, QSC8.3 CM554, QSC8.3 CM850(CM2850), and QSL9 CM554 engines also incorporate the 3909310 studded hexagon cap screw in their assemblies. This screw is used to secure various components, including engine mounts, brackets, and other structural elements, ensuring the engine’s parts remain aligned and stable under operational conditions.

Role of Part 3909310 Studded Hexagon Cap Screw in Engine Systems

The 3909310 Studded Hexagon Cap Screw is integral to the assembly and functionality of various engine components. It is commonly used to secure and maintain the integrity of accessories, ensuring they remain firmly attached and operational. In the fuel system, this screw plays a significant role in attaching the breather to the crankcase, which is essential for maintaining pressure balance and preventing fuel contamination.

When dealing with the cover and cam follower, the 3909310 screw ensures these components are securely fastened, allowing for smooth operation and reducing the risk of mechanical failure. In drainage systems, particularly those involving the remote oil filter, this screw helps in creating a tight seal, which is vital for efficient oil circulation and filtration.

The screw is also utilized in the fuel and fuel pump coupling, where it ensures a secure connection between the fuel pump and the engine, facilitating consistent fuel delivery. Similarly, in the lift pump and module, it maintains the structural integrity necessary for reliable fuel transfer.

In the context of the fuel control and oil sump pump, the 3909310 screw is employed to secure these components, ensuring they function correctly under varying operational conditions. It is also used in the attachment of the pan to the oil pump, where a secure fit is essential to prevent oil leaks and maintain system efficiency.

Furthermore, in auxiliary pump systems and fuel transfer modules, this screw ensures that all connections are robust and reliable, contributing to the overall performance and durability of the engine system.

Conclusion

The 3909310 Studded Hexagon Cap Screw by Cummins is a critical component in the assembly and maintenance of various engine systems. Its robust design, high tensile strength, and resistance to corrosion make it suitable for heavy-duty applications. Proper installation, regular maintenance, and addressing common issues ensure the longevity and reliability of this essential fastener in commercial truck operations.