4078918
Round Head Cap Screw
Cummins®

The Round Head Cap Screw, specifically Part #4078918 by Cummins, is a vital component in the realm of commercial truck maintenance. Cummins, a renowned manufacturer in the industry, produces this fastener to meet the demanding requirements of heavy-duty applications. This screw is integral to ensuring the structural integrity and operational efficiency of commercial trucks.

Basic Concepts of Round Head Cap Screws

Round Head Cap Screws are a type of fastener characterized by a rounded head and a threaded shank. They are commonly used in fastening applications where a countersunk or flush finish is desired. These screws function by providing a secure connection between components, distributing load evenly, and resisting loosening due to vibration or thermal expansion ¹.

Purpose of the 4078918 Round Head Cap Screw in Truck Operation

This Cummins part plays a specific role in the operation and maintenance of commercial trucks. It is utilized in various truck components, including engine mounts, body panels, and chassis assemblies. This screw ensures that parts remain securely fastened, contributing to the overall stability and performance of the vehicle.

Key Features

The 4078918 Round Head Cap Screw is distinguished by several key features. It is made from high-strength steel, ensuring durability and resistance to wear. The screw features a coarse thread, which provides excellent holding power and ease of installation. Its round head design allows for a flush or slightly raised finish, accommodating various aesthetic and functional requirements. Additionally, the screw is coated to enhance corrosion resistance, making it suitable for use in harsh environments ².

Benefits

This part offers several benefits. Its high-strength material composition ensures improved fastening strength, capable of withstanding significant loads and stresses. The corrosion-resistant coating prolongs the screw’s lifespan, even in demanding truck environments. The design of the screw facilitates ease of installation, reducing labor time and effort. Furthermore, its durability contributes to the longevity of the fastening application, minimizing the need for frequent replacements.

Installation Guidelines

Proper installation of the 4078918 Round Head Cap Screw is crucial for ensuring secure and reliable fastening. Begin by selecting the appropriate drill bit size to create a pilot hole, which should be slightly smaller than the screw’s diameter. Use a torque wrench to install the screw, adhering to the manufacturer’s specified torque settings to avoid over-tightening or under-tightening. Employ a magnetic screw holder or similar tool to maintain control during installation. Finally, inspect the installation to ensure the screw is properly seated and the fastened components are secure ³.

Troubleshooting and Maintenance

Common issues with Round Head Cap Screws in truck applications include loosening due to vibration, corrosion, and wear. To address these issues, regularly inspect screws for signs of damage or corrosion. Replace any screws that show signs of wear or failure. Applying a thread locker can help prevent loosening due to vibration. Additionally, maintaining a clean and dry environment around the fastening area can reduce the risk of corrosion.

Safety Considerations

When working with Round Head Cap Screws, it is important to observe several safety guidelines. Use personal protective equipment, such as gloves and safety glasses, to protect against injury. Handle screws carefully to avoid damage or injury. Store screws in a dry, organized environment to prevent corrosion and ensure easy access. Dispose of used or damaged screws according to local regulations to mitigate environmental impact.

Cummins: A Brief 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 strong reputation for quality, innovation, and customer satisfaction in the commercial truck industry. The company’s commitment to excellence is evident in its diverse product portfolio, which includes engines, powertrains, and aftermarket parts designed to meet the rigorous demands of heavy-duty applications.

Cummins Round Head Cap Screw 4078918 in Engine Applications

The Cummins Round Head Cap Screw part number 4078918 is a critical component used in various Cummins engines, ensuring the secure fastening of engine parts. This screw is designed to provide reliable and durable performance in demanding environments.

Application in QSB5.9 CM850 and QSB6.7 M CM2250 Engines

The QSB5.9 CM850 and QSB6.7 M CM2250 engines both utilize the 4078918 screw for fastening specific components. These engines are known for their robust construction and are commonly used in heavy-duty applications. The screw’s design ensures that it can withstand the high torque and stress levels encountered in these engines, maintaining the integrity of the fastened parts over time.

Application in QSC8.3 CM850(CM2850) Engine

The QSC8.3 CM850(CM2850) engine also incorporates the 4078918 screw in its assembly. This engine is designed for high-performance applications and requires components that can endure significant mechanical stress. The screw’s ability to provide a tight and secure fit is essential for the proper functioning of the engine’s components.

Application in QSM11 CM570 Engine

The QSM11 CM570 engine is another model that benefits from the use of the 4078918 screw. This engine is engineered for demanding industrial applications, where reliability and durability are paramount. The screw’s design ensures that it can maintain its fastening capabilities under various operating conditions, contributing to the engine’s overall performance and longevity.

Grouping of Engines

The engines mentioned—QSB5.9 CM850, QSB6.7 M CM2250, QSC8.3 CM850(CM2850), and QSM11 CM570—are grouped based on their common use of the 4078918 screw. This grouping highlights the versatility and reliability of the screw in different engine models, each designed for specific applications but sharing the need for high-quality fastening solutions.

Role of Part 4078918 Round Head Cap Screw in Various Engine System Components

Accessories

In the realm of engine accessories, the 4078918 Round Head Cap Screw is often employed to secure various components. These may include alternator brackets, pulleys, and other auxiliary parts that are essential for the engine’s operation but not directly involved in the combustion process. The screw’s design ensures a tight and reliable fit, which is vital for the longevity and efficiency of these accessories.

Exhaust Outlet

When it comes to the exhaust system, the 4078918 Round Head Cap Screw plays a significant role in maintaining the integrity of the exhaust outlet. It is used to fasten the exhaust manifold to the engine block, ensuring that the connection is secure and leak-free. This is particularly important given the high temperatures and pressures involved in the exhaust process.

Connection Points

In various connection points throughout the engine system, the 4078918 Round Head Cap Screw serves as a reliable fastening solution. Whether it’s connecting the intake manifold to the cylinder head or securing plumbing components, this screw ensures that all connections remain intact under the stress of engine operation.

Plumbing

For plumbing components within the engine system, such as coolant passages and oil lines, the 4078918 Round Head Cap Screw is instrumental. It provides a secure attachment for fittings and hoses, ensuring that fluids are properly channeled without leaks. This is essential for maintaining the engine’s thermal management and lubrication systems.

Exhaust Outlet Connection

Finally, in the exhaust outlet connection, the 4078918 Round Head Cap Screw is used to secure the exhaust pipe to the manifold. This connection is subjected to significant thermal cycling and vibration, making the reliability of the fastening method paramount. The screw’s robust design helps to withstand these conditions, ensuring a durable and efficient exhaust system.

Conclusion

The 4078918 Round Head Cap Screw by Cummins is a critical component in the maintenance and operation of commercial trucks and various engine systems. Its high-strength material, corrosion-resistant coating, and robust design make it suitable for demanding applications. Proper installation and regular maintenance are essential to ensure the longevity and reliability of this part in heavy-duty environments.