3944717
Captive Washer Cap Screw
Cummins®

The Cummins Captive Washer Cap Screw, part number 3944717, is a specialized fastener designed for use in commercial trucks. Cummins, a well-established name in the automotive and heavy-duty truck industry, manufactures this component to meet the rigorous demands of truck operations. This part is integral to various applications within commercial trucks, contributing to their structural integrity and operational efficiency.

Basic Concepts

A Captive Washer Cap Screw is a type of fastener that includes an integrated washer, which is held in place by a protrusion or step on the screw’s shank. This design ensures that the washer remains attached to the screw during installation, reducing the risk of loss and simplifying the assembly process. In mechanical assemblies, these screws are used to secure components together while providing a uniform distribution of clamping force, which helps prevent leaks and ensures a tight seal ¹.

Role in Truck Operation

The 3944717 Captive Washer Cap Screw plays a significant role in the operation and maintenance of commercial trucks. It is commonly used in areas where secure fastening is required, such as engine components, chassis parts, and various structural assemblies. By providing a reliable and consistent clamping force, this screw helps maintain the structural integrity of the truck, ensuring that components remain securely fastened under varying load conditions and environmental stresses ².

Key Features

The 3944717 Captive Washer Cap Screw is designed with several key features that enhance its functionality and durability. Its construction includes a high-strength material, typically a grade of steel that offers excellent resistance to corrosion and wear. The integrated washer is precisely machined to ensure a perfect fit and optimal performance. Additionally, the screw features a hexagonal head for easy installation and removal using standard tools, and its captive washer design eliminates the need for separate washers, streamlining the assembly process ³.

Benefits

Using the 3944717 Captive Washer Cap Screw offers several benefits. The integrated washer design simplifies installation, reducing the likelihood of washers being misplaced or lost during assembly. This feature also ensures consistent clamping force across applications, enhancing the reliability of the fastening. The high-strength material composition provides durability and resistance to corrosion, contributing to the longevity of the fastener. Furthermore, the ease of installation and maintenance makes this screw a practical choice for commercial truck applications.

Troubleshooting and Maintenance

Common issues with the 3944717 Captive Washer Cap Screw may include corrosion, wear, or loosening over time. Regular inspection and maintenance are recommended to ensure optimal performance. If corrosion is detected, cleaning the affected area and applying a corrosion-resistant coating can help mitigate further damage. In cases of wear or loosening, replacing the screw is advised to maintain the structural integrity of the assembly. Proper torque specifications should be followed during installation to ensure the screw is tightened to the manufacturer’s recommendations.

Cummins Captive Washer Cap Screw 3944717: Application Across Engine Models

The Cummins Captive Washer Cap Screw, part number 3944717, is a versatile component utilized across a variety of Cummins engine models. This part is integral to the assembly and maintenance of these engines, ensuring secure fastening and stability in various applications.

ISB Series

The ISB engines, including the ISB, ISB CM850, ISB6.7 CM2250, ISB6.7 CM2350 B101, and QSB5.9 CM850, benefit from the use of the 3944717 screw. This part is crucial in maintaining the integrity of engine components by providing a reliable fastening solution. Its design ensures that it can withstand the operational stresses encountered in these engines.

ISC Series

In the ISC engines, specifically the ISC CM554 and ISC CM850, the 3944717 screw plays a pivotal role. It is used in various applications where secure fastening is critical, such as attaching engine covers or securing internal components. The screw’s captive washer feature adds an extra layer of security, preventing the screw from loosening due to vibration or thermal expansion.

ISL Series

The ISL engines, including the ISL CM554 and ISL9 CM2150 SN, also incorporate the 3944717 screw. This part is essential for the assembly of engine components, ensuring that parts remain securely fastened under the demanding conditions these engines operate in. The screw’s design allows for easy installation and removal, facilitating efficient maintenance procedures.

ISV Series

For the ISV (Nissan) engine, the 3944717 screw is used in specific applications where secure fastening is necessary. Its design ensures that it can handle the operational stresses of this engine, providing a reliable fastening solution.

QSC Series

In the QSC engines, such as the QSC8.3 CM554 and QSC8.3 CM850 (CM2850), the 3944717 screw is utilized to secure various engine components. Its captive washer feature adds an extra layer of security, ensuring that the screw remains tightly fastened even under operational stresses.

QSL Series

The QSL engines, including the QSL8.9 CM2150 L141, QSL9 CM554, and QSL9 CM850 (CM2850), also use the 3944717 screw. This part is essential for maintaining the structural integrity of these engines, providing a reliable fastening solution in various applications. Its design ensures that it can withstand the operational stresses encountered in these engines.

Role of Part 3944717 Captive Washer Cap Screw in Engine Systems

The 3944717 Captive Washer Cap Screw is instrumental in securing various components within engine systems, ensuring stability and proper function. In the context of a Camshaft installation, this screw plays a part in fastening the camshaft to its housing, contributing to the precise timing necessary for engine operation.

When dealing with a Front Crankshaft Seal Kit, the 3944717 screw is often used to secure the seal in place, preventing oil leaks and maintaining the integrity of the crankshaft environment.

In Fuel Plumbing systems, this screw is employed to fasten fuel lines and connectors, ensuring a secure and leak-free connection which is vital for the safe and efficient delivery of fuel to the engine.

For Fuel Pump Kits, the screw is utilized to secure the pump assembly within the fuel tank, ensuring it remains stable and functions correctly under varying conditions.

In the installation of a Fuel Transfer Tube, the 3944717 screw helps in securing the tube to the fuel system, guaranteeing a stable and reliable fuel transfer process.

The Hardware Kit often includes the 3944717 screw for various fastening applications throughout the engine, from securing brackets to attaching sensors.

In High Pressure Fuel Line Bracket Kits, this screw is used to fasten the brackets that hold the high-pressure fuel lines in place, ensuring they are securely mounted and resistant to movement.

For Injectors, the screw is crucial in securing the injector to the engine block or cylinder head, ensuring it is properly aligned and sealed.

In Injector Fuel Supply Tube installations, the screw secures the tube to the injector, maintaining a stable fuel supply connection.

When working with Injector Plumbing, the 3944717 screw is used to fasten various components, ensuring a secure and leak-free system.

In Long Block Kits, this screw is utilized in multiple applications, from securing sensors to fastening hardware, contributing to the overall stability and function of the engine.

For Nitrogen Oxide Sensors, the screw is used to secure the sensor to the exhaust system, ensuring accurate readings and reliable performance.

In Sensor Kits and Sensor Nitrogen Oxide applications, the screw plays a role in securing sensors to their respective locations, ensuring they function correctly and provide accurate data.

In a Service Kit, the 3944717 screw is often included for various fastening needs, from securing gaskets to attaching hardware.

For Tube Brace installations, the screw is used to secure the brace to the engine, providing additional support and stability.

In an Upper Engine Gasket Kit, this screw is utilized to secure gaskets and components, ensuring a proper seal and stable installation.

Conclusion

The Cummins Captive Washer Cap Screw, part number 3944717, is a critical component in the maintenance and operation of commercial trucks and various Cummins engine models. Its design, featuring an integrated washer and high-strength material, ensures reliable fastening and durability under demanding conditions. The screw’s applications across different engine systems highlight its versatility and importance in maintaining the structural integrity and operational efficiency of these engines.

References