4026354
Captive Washer Cap Screw
Cummins®

Introduction

The Cummins 4026354 Captive Washer Cap Screw is a specialized fastener designed for use in heavy-duty truck maintenance and operation. This component is integral to ensuring the structural integrity and efficient functioning of various truck systems. Its design and functionality are tailored to meet the demanding requirements of heavy-duty applications, providing reliable performance under strenuous conditions ¹.

Basic Concepts of Captive Washer Cap Screws

A Captive Washer Cap Screw is a type of fastener that incorporates a washer within its design. This washer is held in place by a collar or step in the screw’s shaft, ensuring it remains attached during installation and operation. The primary function of this type of screw is to provide a secure and consistent clamping force, which is crucial for maintaining the integrity of mechanical assemblies. Captive Washer Cap Screws are commonly used in applications where vibration and movement could cause standard washers to become dislodged ².

Purpose and Role in Truck Operation

The Cummins 4026354 Captive Washer Cap Screw plays a significant role in the operation and maintenance of heavy-duty trucks. It is utilized in various areas of the truck’s structure and systems, including engine components, chassis assemblies, and other critical areas where secure fastening is required. By providing a reliable clamping force, this screw helps to maintain the alignment and integrity of components, contributing to the overall performance and durability of the truck ³.

Key Features

The Cummins 4026354 Captive Washer Cap Screw is characterized by several key features that enhance its functionality and durability. These include a precision-machined design, high-quality material composition, and a captive washer mechanism that ensures the washer remains in place during installation. The screw is also designed to withstand high levels of stress and vibration, making it suitable for heavy-duty applications ⁴.

Benefits

Using the Cummins 4026354 Captive Washer Cap Screw offers several advantages. These include improved assembly efficiency, as the captive washer eliminates the need for separate washer installation. Additionally, the screw provides enhanced structural integrity by ensuring a consistent and secure clamping force. Its durable construction also contributes to long-term reliability, reducing the need for frequent replacements ⁵.

Installation Process

Proper installation of the Cummins 4026354 Captive Washer Cap Screw involves several steps to ensure optimal performance. Begin by selecting the appropriate drill bit size for the pilot hole, ensuring it matches the screw’s diameter. Drill the pilot hole to the recommended depth, taking care to avoid damage to surrounding components. Next, align the screw with the pilot hole and use a torque wrench to tighten it to the specified torque setting. This ensures the screw is securely fastened without over-tightening, which could damage the thread or surrounding material ⁶.

Troubleshooting and Maintenance

Common issues with Captive Washer Cap Screws may include loosening due to vibration or corrosion. To address these issues, regularly inspect the screws for signs of wear or damage. If loosening is detected, re-tighten the screw to the specified torque setting. In cases of corrosion, consider replacing the screw to prevent further degradation. Regular maintenance and inspection will help ensure the longevity and performance of the screw ⁷.

Compatibility and Usage

The Cummins 4026354 Captive Washer Cap Screw is designed for use in various heavy-duty truck applications. It is compatible with a range of systems and components, including engine assemblies, chassis structures, and other critical areas where secure fastening is required. Its versatile design makes it suitable for a wide range of heavy-duty applications ⁸.

Safety Considerations

When working with Captive Washer Cap Screws, it is important to observe several safety guidelines and precautions. Always wear appropriate personal protective equipment (PPE), including safety glasses and gloves, to protect against injury. Use the correct tools and techniques for installation and removal to avoid damage to the screw or surrounding components. Additionally, ensure the work area is clean and free of debris to prevent contamination of the screw or washer ⁹.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emissions technologies. With a history spanning over a century, Cummins has established a reputation for innovation, quality, and reliability in the automotive and heavy-duty truck industry. The company’s product range includes a variety of components and systems designed to meet the demanding requirements of heavy-duty applications ¹⁰.

Compatibility with Cummins Engines

The Cummins 4026354 Captive Washer Cap Screw is compatible with various Cummins engine series, ensuring secure fastening and stability. Below is a detailed description of its compatibility with different Cummins engine series:

G855 Series

• G855
• G855 CM558
• GTA855 CM558 (CM2358) G101

The Captive Washer Cap Screw is integral to the G855 series engines, providing essential fastening for various components within the engine assembly. Its design ensures that it remains securely in place, preventing loosening due to vibrations and thermal expansion ¹¹.

N14 Series

• N14 CELECT PLUS
• N14 G
• N14 MECHANICAL

In the N14 series, the Captive Washer Cap Screw is used in both electronic and mechanical variants. It plays a critical role in maintaining the structural integrity of the engine by securing parts that are subjected to high stress and temperature variations ¹².

NH/NT 855 Series

• NH/NT 855

This engine series also benefits from the use of the Captive Washer Cap Screw. Its application in this series ensures that critical engine components are fastened reliably, contributing to the overall performance and longevity of the engine ¹³.

QSN14 Series

• QSN14 CM876 N103

The QSN14 CM876 N103 engine incorporates the Captive Washer Cap Screw in its design. This part is essential for securing components that are vital for the engine’s operation, ensuring that the engine can withstand the rigors of demanding applications ¹⁴.

Role in Engine Systems

The Cummins 4026354 Captive Washer Cap Screw is instrumental in securing various components within engine systems, ensuring stability and integrity during operation.

In the context of mounting components, this screw plays a significant role in attaching brackets, supports, and other structural elements to the engine frame. Its design allows for a secure fit, minimizing the risk of component displacement under vibrational stress.

When it comes to the oil pan, the 4026354 screw is often used to fasten the oil pan to the engine block. This connection is vital for maintaining the structural integrity of the oil pan, which houses the engine’s lubricant. Proper fastening ensures that the oil pan remains securely in place, preventing oil leaks and maintaining optimal lubrication for engine components ¹⁵.

In oil mounting pans and oil pan service kits, this screw is utilized to reassemble and secure the pan after maintenance or replacement. Its captive washer feature prevents the screw from loosening over time, which is essential for the longevity and reliability of the oil pan assembly ¹⁶.

Conclusion

The Cummins 4026354 Captive Washer Cap Screw is a fundamental component in the assembly and maintenance of engine systems, providing the necessary security and stability for various critical parts. Its design and functionality are tailored to meet the demanding requirements of heavy-duty applications, ensuring reliable performance under strenuous conditions.