4026666
Captive Washer Cap Screw
Cummins®

The Captive Washer Cap Screw, specifically Part #4026666 by Cummins, is a component designed for use in heavy-duty trucks. Cummins, a well-established manufacturer in the automotive industry, produces this part to meet the demanding requirements of truck engines and systems. This screw plays a role in ensuring the secure attachment of various components within a truck’s engine or other systems.

Basic Concepts and Functionality

A Captive Washer Cap Screw is a type of fastener that includes an integrated washer. This design allows for efficient and secure fastening, reducing the risk of washer loss during installation. The screw operates by threading into a pre-tapped hole, with the captive washer providing a uniform distribution of clamping force across the fastened materials. This mechanism is vital for maintaining the integrity and alignment of components within a truck’s engine or other mechanical systems ¹.

Purpose of the 4026666 Captive Washer Cap Screw

This Cummins part is utilized in various applications within heavy-duty trucks. It plays a role in securing components such as engine covers, brackets, and other critical parts. Its design ensures that these components remain firmly in place, even under the vibrations and stresses encountered during truck operation. This screw is particularly valuable in applications where maintaining precise alignment and secure attachment is necessary for optimal performance and safety ².

Key Features

The 4026666 Captive Washer Cap Screw boasts several key features that enhance its performance. Its design includes a captive washer, which is integral to the screw, ensuring that the washer remains in place during installation. The screw is made from high-quality materials, providing durability and resistance to corrosion. Additionally, its threading is designed to offer a secure grip, minimizing the risk of loosening over time ³.

Benefits

Using this Cummins part offers several advantages. The integrated washer simplifies the installation process, reducing the likelihood of washer loss and ensuring consistent clamping force. This design also contributes to improved reliability, as the screw and washer work together to maintain a secure attachment. Furthermore, the ease of installation and the screw’s durability make it a cost-effective solution for maintaining and repairing heavy-duty trucks.

Installation Process

Installing the 4026666 Captive Washer Cap Screw involves several steps to ensure proper fastening. Begin by aligning the screw with the pre-tapped hole. Use a torque wrench to tighten the screw to the manufacturer’s specified torque setting, ensuring a secure fit without over-tightening. It is important to follow best practices, such as using the correct tools and ensuring the work area is clean and free of debris, to avoid common pitfalls like cross-threading or damage to the screw or surrounding components.

Troubleshooting and Maintenance

To ensure the longevity of the 4026666 Captive Washer Cap Screw, regular maintenance and inspection are recommended. Look for signs of wear, corrosion, or loosening, which may indicate the need for tightening or replacement. Common issues can often be addressed by re-torquing the screw to the specified setting. If significant wear or damage is observed, consider replacing the screw to maintain the integrity of the fastened components.

Compatibility and Usage

The 4026666 Captive Washer Cap Screw is designed for use in Cummins engines and is compatible with various truck models and series. Its application extends to securing engine components, brackets, and covers, ensuring these parts remain in place under the demanding conditions of heavy-duty truck operation. When selecting this screw for a specific application, it is important to verify compatibility with the truck’s make and model to ensure optimal performance.

Safety Considerations

When handling and working with the 4026666 Captive Washer Cap Screw, it is important to follow safety guidelines to protect yourself and ensure the quality of the work. Wear appropriate personal protective equipment, such as gloves and safety glasses, to prevent injury. Work in a well-ventilated area and use the correct tools to avoid accidents. Additionally, always refer to the manufacturer’s instructions for torque settings and installation procedures to ensure safe and effective use of the screw.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history of innovation and commitment to quality, Cummins serves customers in approximately 190 countries and territories through a network of more than 600 company-owned and independent distributor facilities and more than 7,200 dealer locations. Cummins’ product range includes engines for on-highway, off-highway, and stationary applications, as well as related technologies that include aftermarket parts, warranties, software, and integrated solutions.

Cummins Captive Washer Cap Screw Part 4026666 Compatibility

The Cummins Captive Washer Cap Screw part number 4026666 is a critical component that finds application across a range of Cummins engine models. This part is designed to ensure secure fastening and stability in various engine assemblies, contributing to the overall integrity and performance of the engines.

ISX Series Engines

The ISX series engines, including the ISX CM570, ISX CM870, and ISX CM871, benefit from the use of part 4026666. This screw is integral in securing various engine components, ensuring that the engine operates smoothly and efficiently. The ISX engines are known for their robust design and high performance, and the use of such a reliable screw helps maintain the engine’s structural integrity.

ISX15 Series Engines

For the ISX15 series engines, which include the ISX15 CM2250, ISX15 CM2250 SN, and ISX15 CM2350 X101, the part 4026666 plays a crucial role in fastening and securing multiple parts within the engine. These engines are designed for heavy-duty applications, and the use of this cap screw ensures that all components are held firmly in place, contributing to the engine’s durability and longevity.

QSX15 Series Engines

The QSX15 series engines, specifically the QSX15 CM2250 ECF and QSX15 CM2350 X105, also utilize the part 4026666. This screw is essential in maintaining the structural integrity of these engines, which are known for their high power output and efficiency. By securing various components, the cap screw helps ensure that the engine operates at peak performance.

X15 Series Engines

The X15 series engines, including the X15 CM2350 X116B, X15 CM2350 X123B, and X15 CM2450 X134B, also incorporate the part 4026666 in their design. This screw is vital for fastening and securing components within these engines, which are designed for a range of applications from on-highway to off-highway use. The use of this cap screw helps maintain the engine’s structural integrity and ensures reliable performance.

Role of Part 4026666 Captive Washer Cap Screw in Engine Systems

In engine systems, the part 4026666 Captive Washer Cap Screw is instrumental in securing various components, ensuring they remain firmly in place under operational conditions. Specifically, this screw is utilized in the assembly and maintenance of the flywheel housing and the flywheel itself.

Flywheel Housing

The flywheel housing is a critical component that encases the flywheel, providing a secure environment for it to operate. The 4026666 Captive Washer Cap Screw is employed to fasten the housing to the engine block. This ensures that the housing remains stable and does not shift during engine operation, which could lead to misalignment and subsequent mechanical issues. The screw’s design, featuring a captive washer, enhances its effectiveness by preventing the washer from becoming dislodged, thereby maintaining consistent pressure and secure fastening.

Flywheel

The flywheel is a heavy rotating disk connected to the engine crankshaft, used to store rotational energy. It plays a significant role in smoothing out the power delivery from the engine’s combustion cycles. The 4026666 Captive Washer Cap Screw is used to secure the flywheel to the crankshaft or other mounting points within the engine system. This secure attachment is vital for the flywheel to perform its function efficiently, ensuring that the rotational energy is consistently transferred and managed. The captive washer in the screw design aids in distributing the load evenly, reducing the risk of screw loosening over time due to engine vibrations.

Housing

In broader applications within the engine system, the 4026666 Captive Washer Cap Screw is also used in various housings that protect and support other engine components. Whether it is securing a gear housing or an accessory housing, the screw ensures that these components remain intact and operational. The captive washer feature is particularly beneficial in these applications, as it simplifies the assembly process and enhances the reliability of the fastening.

Conclusion

Overall, the 4026666 Captive Washer Cap Screw is a versatile and reliable component in engine systems, providing essential support and stability to critical engine components. Its design and functionality make it a valuable asset in the maintenance and repair of heavy-duty trucks, ensuring that engines operate efficiently and reliably.