3408217
Captive Washer Cap Screw
Cummins®

The Cummins 3408217 Captive Washer Cap Screw is a specialized fastener designed for use in heavy-duty truck applications. Its purpose is to provide secure and reliable fastening in environments where traditional screws might fail due to vibration, high stress, or exposure to the elements. The significance of this component lies in its ability to enhance the durability and performance of truck components, ensuring that critical parts remain securely fastened under demanding conditions ¹.

Basic Concepts of Captive Washer Cap Screws

A captive washer cap screw is a type of fastener that includes an integrated washer held in place by a groove or other mechanism. This design ensures that the washer remains attached to the screw, preventing loss during installation and providing consistent and reliable performance. In the automotive industry, captive washer cap screws are commonly used in applications where vibration and movement could cause traditional screws and washers to become misaligned or lost. They are particularly useful in heavy-duty applications where secure fastening is paramount ².

Purpose and Role in Truck Operation

The 3408217 Captive Washer Cap Screw plays a specific role in the operation and maintenance of heavy-duty trucks by providing a secure fastening solution in areas prone to vibration and stress. It is often used in the attachment of critical components such as engine mounts, exhaust systems, and chassis parts. By ensuring that these components remain firmly in place, the screw contributes to the overall reliability and safety of the truck ³.

Key Features

The Cummins 3408217 Captive Washer Cap Screw features several design elements that enhance its functionality. These include a robust construction that can withstand high stress, a captive washer that ensures consistent torque application, and a corrosion-resistant coating that protects against environmental factors. The screw is also designed with a hex head for easy installation using standard tools.

Benefits

Using the 3408217 Captive Washer Cap Screw offers several advantages. Its design enhances reliability by preventing the washer from becoming misplaced during installation. The integrated washer also ensures consistent torque application, which is critical in maintaining the integrity of fastened components. Additionally, the screw’s corrosion-resistant properties make it suitable for use in demanding conditions, prolonging its lifespan and reducing the need for frequent replacements.

Installation Process

Proper installation of the 3408217 Captive Washer Cap Screw involves several steps to ensure optimal performance. Begin by cleaning the installation area to remove any debris or contaminants. Use a torque wrench to install the screw, applying the manufacturer’s recommended torque specifications to avoid over-tightening or under-tightening. Ensure that the screw is aligned correctly with the fastening hole to prevent cross-threading. Finally, double-check the installation to confirm that the screw is secure and the washer is properly seated.

Troubleshooting and Maintenance

Common issues with the 3408217 Captive Washer Cap Screw may include loosening due to vibration or corrosion. To address these issues, regularly inspect the screw and surrounding components for signs of wear or damage. If corrosion is present, clean the affected area and apply a corrosion-resistant coating. In cases of loosening, re-torque the screw to the manufacturer’s specifications. Regular maintenance and inspection will help prolong the lifespan of the screw and ensure continued reliable operation.

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 reputation for innovation, quality, and reliability in the automotive and heavy-duty truck industry. The company’s product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of heavy-duty applications. Cummins’ commitment to excellence is reflected in its extensive research and development efforts, ensuring that its products continue to evolve and meet the needs of its customers.

Captive Washer Cap Screw 3408217 in Cummins Engines

The Captive Washer Cap Screw 3408217 is a critical component in several Cummins engine models, ensuring secure fastening and stability within the engine assembly. This part is meticulously designed to fit seamlessly into the engine architecture, providing a reliable connection between various engine components.

K19 and KTA19GC CM558 Engines

In the K19 and KTA19GC CM558 engines, the Captive Washer Cap Screw 3408217 is used in several key areas. It is often employed in the cylinder head assembly, securing the head bolts to the engine block. This ensures that the cylinder head is tightly fastened, preventing leaks and maintaining the integrity of the combustion chamber. Additionally, this screw is utilized in the engine’s mounting system, where it helps to secure the engine to the vehicle’s chassis, providing stability and reducing vibrations.

QSK19 CM500 and QSK19G Engines

For the QSK19 CM500 and QSK19G engines, the Captive Washer Cap Screw 3408217 plays a similar role in maintaining structural integrity. It is commonly found in the engine’s head gasket assembly, ensuring that the gasket is properly sealed and that there is no movement between the engine block and the cylinder head. This is crucial for maintaining optimal engine performance and preventing overheating.

Moreover, this screw is also used in the engine’s accessory drive system, where it helps to secure various pulleys and tensioners. This ensures that the belts and chains that drive the engine’s ancillary systems, such as the alternator and water pump, remain properly tensioned and aligned, preventing slippage and ensuring efficient operation.

In both engine series, the Captive Washer Cap Screw 3408217 is a testament to Cummins’ commitment to quality and durability. Its precise design and robust construction make it an essential component in the reliable operation of these engines.

Role of Part 3408217 Captive Washer Cap Screw in Engine Systems

The Part 3408217 Captive Washer Cap Screw is integral to the secure assembly and reliable operation of various engine components. It ensures the stability and integrity of connections across multiple systems.

In the water outlet system, this screw is used to firmly attach the water outlet to its housing. This secure connection is essential for maintaining the flow of coolant, which is vital for engine temperature regulation.

Within the thermostat housing, the screw plays a role in ensuring that the thermostat is correctly positioned and sealed. This is important for the accurate control of coolant flow based on engine temperature.

For the housing aftercooler mounting, the screw is employed to attach the aftercooler to its designated housing. This connection is necessary for the effective cooling of air before it enters the engine, enhancing performance and efficiency.

In the context of the air intake manifold, the screw is used to secure the manifold to the engine. This ensures a tight seal, which is important for the proper air-fuel mixture and engine performance.

When it comes to plumbing connections, such as those in the keel cooler system, the screw helps in creating secure joints. This is essential for the efficient transfer of fluids and the overall functionality of the cooling system.

In the auxiliary cooling system, the screw is utilized to mount various components, ensuring they are firmly in place and operating as intended. This contributes to the system’s ability to manage engine temperatures under varying conditions.

Lastly, in the water outlet connecting mounting, the screw ensures that the water outlet is securely connected to other components. This is vital for maintaining the integrity of the coolant system and preventing leaks.

Conclusion

The Cummins 3408217 Captive Washer Cap Screw is a vital component in the operation and maintenance of heavy-duty trucks and Cummins engines. Its robust design, integrated washer, and corrosion-resistant properties make it an essential part for ensuring secure fastening in demanding environments. Proper installation, regular maintenance, and understanding its role in various engine systems are crucial for maximizing the performance and reliability of these vehicles.