3901858
Hexagon Head Cap Screw
Cummins®

Introduction

The Cummins 3901858 Hexagon Head Cap Screw is a specialized fastener designed for heavy-duty truck applications. It is integral to the maintenance and operation of these vehicles, providing secure fastening for various components. This screw is part of Cummins Inc.’s extensive range of high-quality parts designed to enhance the reliability and performance of heavy-duty trucks.

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 a wrench or socket. These screws are widely used in mechanical assemblies to secure components together. They are favored for their ability to distribute clamping force evenly, which helps maintain the integrity of the fastened components ¹.

Purpose and Role in Truck Operation

The Cummins 3901858 Hexagon Head Cap Screw plays a significant role in the operation and maintenance of heavy-duty trucks. It is used in various applications, including securing engine components, transmission parts, and chassis assemblies. By providing a reliable fastening solution, this screw helps ensure that critical components remain securely in place, contributing to the overall performance and safety of the truck ².

Key Features

The Cummins 3901858 Hexagon Head Cap Screw is designed with several key features that enhance its functionality and durability. It is typically made from high-strength steel, which provides excellent resistance to wear and corrosion. The screw features a coarse thread type, which allows for quick and secure fastening. Additionally, its hexagonal head design ensures easy installation and removal using standard tools ³.

Benefits

Using the Cummins 3901858 Hexagon Head Cap Screw offers several benefits. Its high-strength material composition ensures improved reliability and longevity. The screw’s design allows for ease of installation, reducing the time required for maintenance tasks. Furthermore, its resistance to wear and corrosion helps maintain optimal performance over time, even in demanding operating conditions.

Installation and Usage Guidelines

Proper installation of the Cummins 3901858 Hexagon Head Cap Screw is crucial for ensuring secure and effective fastening. To install the screw, use a wrench or socket that fits the hexagonal head. Tighten the screw to the recommended torque specification to achieve the desired clamping force without over-tightening, which could damage the components or the screw itself. Ensure that the mating surfaces are clean and free of debris to promote a strong and lasting connection.

Troubleshooting Common Issues

Common issues with Hexagon Head Cap Screws include loosening over time and corrosion. To address loosening, periodically check the tightness of the screws and re-tighten as necessary. If corrosion is detected, clean the affected area thoroughly and consider applying a corrosion-resistant coating to prevent further degradation. In cases where the screw is damaged or worn, replacement may be necessary to maintain the integrity of the fastened components.

Maintenance Tips

Regular maintenance of the Cummins 3901858 Hexagon Head Cap Screw is important for ensuring longevity and optimal performance. Inspect the screws during routine maintenance intervals to check for signs of wear, corrosion, or loosening. Clean the screws and mating surfaces as needed to remove any debris or contaminants. Follow the manufacturer’s guidelines for torque specifications and replacement intervals to maintain the effectiveness of the fastening solution.

Safety Considerations

When working with Hexagon Head Cap Screws, it is important to observe safety protocols to prevent injuries and ensure proper handling. Use the appropriate tools and techniques to install and remove the screws. Store the screws in a dry, secure location to prevent corrosion and damage. Dispose of any damaged or worn screws properly to avoid potential hazards.

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 strong reputation in the heavy-duty truck industry for producing high-quality, reliable components. The company’s extensive product range includes engines, powertrain components, and aftermarket parts, all designed to enhance the performance and durability of heavy-duty vehicles.

Hexagon Head Cap Screw 3901858 Compatibility with Cummins Engines

The Cummins part number 3901858, a Hexagon Head Cap Screw, is a versatile component designed to fit a variety of Cummins engines. This screw is integral in securing various parts and assemblies within the engine, ensuring structural integrity and proper function. Below is a detailed overview of its compatibility with specific Cummins engine models:

6B5.9 and 6C8.3 Engines

The 6B5.9 and 6C8.3 engines, known for their robust design and reliability, utilize the 3901858 screw in several critical applications. This includes securing engine covers, mounting brackets, and other structural components that require a strong, durable fastening solution.

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

In the B5.9 G and B5.9 GAS PLUS CM556 engines, the 3901858 screw is employed in the assembly of the cylinder head and other internal components. Its hexagonal head design allows for easy tightening and removal, making maintenance and repairs more efficient.

C GAS PLUS CM556 Engine

The C GAS PLUS CM556 engine also benefits from the use of the 3901858 screw. This engine, designed for high performance, requires reliable fastening solutions to maintain its structural integrity under demanding conditions. The screw is used in various applications, including securing the engine block and other critical assemblies.

ISB CM550 and ISB CM850 Engines

The ISB CM550 and ISB CM850 engines, part of Cummins’ Intelligent Systems for Better Performance series, incorporate the 3901858 screw in multiple applications. These engines are known for their efficiency and reliability, and the screw plays a crucial role in maintaining their performance by securing various engine components.

ISL9 CM2150 SN and ISL9.5 CM2880 L138 Engines

The ISL9 CM2150 SN and ISL9.5 CM2880 L138 engines, which are part of the ISL series, also utilize the 3901858 screw. This screw is essential in securing the engine’s internal components, ensuring that the engine operates smoothly and efficiently.

L8.9, L8.9 CM2670 L134C, and L8.9G CMOH2.0 L125B Engines

The L8.9, L8.9 CM2670 L134C, and L8.9G CMOH2.0 L125B engines are another set of Cummins engines that incorporate the 3901858 screw. This screw is used in various applications, including securing the engine’s outer casing and other structural components.

QSL8.9 CM2150 L141 and QSL9 CM850 (CM2850) Engines

Lastly, the QSL8.9 CM2150 L141 and QSL9 CM850 (CM2850) engines also use the 3901858 screw. This engine, known for its durability and performance, relies on the screw to secure various components, ensuring that the engine operates at peak efficiency.

Role of Part 3901858 Hexagon Head Cap Screw in Various Engine Systems

Coolant Heater Starting Aid

In the coolant heater starting aid system, the 3901858 Hexagon Head Cap Screw is utilized to secure the housing components. This ensures that the housing remains firmly in place, providing a stable environment for the coolant heater to function effectively. The screw’s robust design helps maintain the integrity of the system, allowing for efficient heat transfer and reliable engine starting in cold conditions.

Alternator and Alternator Mounting

For the alternator and its mounting system, the 3901858 Hexagon Head Cap Screw plays a significant role in securing the alternator to its mounting bracket. This connection is essential for the alternator’s stable operation, ensuring it can generate and regulate electrical power without vibration or movement that could lead to inefficiencies or damage.

Flywheel and Mounting

In the flywheel assembly, the 3901858 Hexagon Head Cap Screw is employed to fasten the flywheel to the engine block or crankshaft. This secure attachment is vital for the smooth transfer of power from the engine to the transmission, ensuring consistent and reliable engine performance.

Generator and Muffler

When integrating the generator into the engine system, the 3901858 Hexagon Head Cap Screw is used to attach the generator housing and ensure it remains securely in place. Similarly, in the muffler and muffler kit package, this screw is utilized to fasten the muffler components, maintaining the structural integrity of the exhaust system and ensuring efficient noise reduction and exhaust flow.

Railcar Installation and Plumbing

During railcar installations, the 3901858 Hexagon Head Cap Screw is often used in plumbing applications to secure various components, such as pipes and fittings. This ensures a leak-free and stable system, critical for the safe and efficient operation of the railcar’s engine and auxiliary systems.

Base and Rail Applications

In base and rail applications, the 3901858 Hexagon Head Cap Screw is instrumental in securing the engine or component bases to the rail or frame. This provides a solid foundation for the engine, reducing the risk of movement or misalignment that could affect performance and safety.

Conclusion

The Cummins 3901858 Hexagon Head Cap Screw is a critical component in various heavy-duty truck applications, ensuring secure fastening and reliable operation of engine components. Its high-strength design, ease of installation, and resistance to wear and corrosion make it an essential part of Cummins’ extensive range of high-quality parts. Proper installation, regular maintenance, and adherence to safety protocols are crucial for maximizing the performance and longevity of this screw in demanding operating conditions.