3328687
Captive Washer Cap Screw
Cummins®

The 3328687 Captive Washer Cap Screw is a specialized fastener designed for heavy-duty truck applications. Manufactured by Cummins, a renowned name in the automotive industry, this screw serves a role in ensuring the secure attachment of various components within heavy-duty trucks. Cummins is well-regarded for its commitment to quality and innovation, making the 3328687 a reliable choice for truck operators and maintenance professionals ¹.

Basic Concepts of Captive Washer Cap Screws

A Captive Washer Cap Screw is a type of fastener that includes an integrated washer, which remains attached to the screw during installation. This design eliminates the need for separate washers, streamlining the installation process and reducing the risk of washer loss. In the automotive industry, these screws are commonly used in applications where secure and consistent clamping force is required, such as in engine components, chassis assemblies, and various mechanical systems ².

Purpose and Role in Truck Operation

The 3328687 Captive Washer Cap Screw is specifically designed to enhance the functionality and reliability of heavy-duty truck components. It plays a role in securing critical parts, ensuring they remain firmly in place under various operating conditions. By providing a consistent and reliable clamping force, this screw contributes to the overall performance and durability of the truck, helping to maintain optimal operation of the vehicle’s systems ³.

Key Features

The 3328687 Captive Washer Cap Screw boasts several key features that enhance its performance. Its design includes an integrated washer, which ensures a uniform distribution of clamping force across the fastened components. The screw is made from high-strength materials, providing durability and resistance to wear and corrosion. Additionally, the screw features a cap head design, which offers a larger bearing surface and improved torque application during installation.

Benefits

Using the 3328687 Captive Washer Cap Screw offers several benefits. The integrated washer simplifies the installation process, reducing the likelihood of errors and ensuring a secure fit. The high-strength materials used in its construction contribute to improved durability, making it suitable for heavy-duty applications. Furthermore, the consistent clamping force provided by the captive washer enhances the sealing properties of the fastened components, helping to prevent leaks and maintain system integrity.

Installation Process

Proper installation of the 3328687 Captive Washer Cap Screw is crucial for ensuring optimal performance. To install the screw, first, ensure that the mating surfaces are clean and free of debris. Use a torque wrench to apply the recommended torque specifications, which can be found in the vehicle’s service manual. This ensures that the screw is tightened to the correct level, providing a secure and reliable connection without over-tightening, which could damage the components.

Troubleshooting and Maintenance

Common issues with the 3328687 Captive Washer Cap Screw may include loosening over time due to vibration or corrosion. Regular inspection and maintenance can help identify and address these issues. If loosening is detected, re-tighten the screw to the specified torque. In cases of corrosion, clean the affected areas and consider applying a corrosion-resistant coating to prevent further issues. Regular maintenance helps ensure the longevity and optimal performance of the screw.

Cummins: Manufacturer Overview

Cummins is a leading manufacturer in the automotive industry, known for its high-quality engines and components. With a history of innovation and a commitment to excellence, Cummins has established a reputation for producing reliable and durable products. Their expertise in engine technology and component design makes them a trusted choice for heavy-duty truck applications, ensuring that their products meet the demanding requirements of the industry.

Captive Washer Cap Screw (Part 3328687) in Cummins Engines

The Captive Washer Cap Screw, identified by part number 3328687, is a component in several Cummins engine models. This part is integral to the assembly and operation of these engines, ensuring secure fastening and stability.

ISM CM570 and ISM CM570/870

In the ISM CM570 and ISM CM570/870 engines, the 3328687 part is used to secure various components, maintaining the integrity of the engine’s structure. Its role is vital in ensuring that parts remain firmly in place under operational stresses.

ISM CM876

The ISM CM876 engine also utilizes the 3328687 part. Here, it is employed in similar applications, providing the necessary fastening to keep the engine’s components aligned and secured.

L10 CELECT and M11 CELECT

In the L10 CELECT and M11 CELECT engines, the 3328687 part is used to fasten and stabilize key components. Its design ensures that the engine can withstand the rigors of heavy-duty operations, maintaining performance and reliability.

M11 CELECT PLUS

The M11 CELECT PLUS engine incorporates the 3328687 part in its assembly. This part is essential for securing various engine components, contributing to the overall durability and efficiency of the engine.

QSM11 CM570

In the QSM11 CM570 engine, the 3328687 part is used to fasten and stabilize critical components. Its design and placement are crucial for ensuring the engine operates smoothly and efficiently under various conditions.

Each of these engines relies on the 3328687 part to maintain structural integrity and operational efficiency. The use of this captive washer cap screw across multiple engine models underscores its importance in Cummins’ engine design and performance.

Role of Part 3328687 Captive Washer Cap Screw in Engine Systems

The 3328687 Captive Washer Cap Screw is instrumental in securing and maintaining the integrity of various components within engine systems. Its application ensures that connections remain stable and reliable under the demanding conditions of engine operation.

Integration with the Electronic Control Module Wiring Harness

In the electronic control module (ECM) wiring harness, the 3328687 Captive Washer Cap Screw is used to fasten connectors and terminals. This secure attachment prevents loosening due to vibrations, ensuring consistent electrical connections that are vital for the ECM to receive and transmit data accurately.

Securing the Engine Control Module

For the engine control module (ECM), the 3328687 Captive Washer Cap Screw plays a role in mounting the module to its designated location. This secure fit is essential for protecting the ECM from physical damage and environmental factors, such as moisture and debris, which could otherwise interfere with its operation.

Application in the Engine Control Wiring Harness

Within the engine control wiring harness, the 3328687 Captive Washer Cap Screw is employed to fasten various components, including sensors and actuators. This ensures that all wiring remains taut and organized, reducing the risk of shorts or opens that could disrupt engine performance.

Use in Wiring Accessories

Wiring accessories, such as junction blocks and fuse holders, also benefit from the secure attachment provided by the 3328687 Captive Washer Cap Screw. By maintaining a firm connection, these accessories can reliably distribute electrical power and signals throughout the engine system, contributing to overall system stability and efficiency.

Conclusion

The 3328687 Captive Washer Cap Screw is a critical component in heavy-duty truck applications, particularly within Cummins engines. Its design and features contribute to the secure fastening and stability of various engine components, ensuring optimal performance and durability. Proper installation and maintenance of this screw are essential for maintaining the integrity and efficiency of the engine systems it supports.