3921816
Studded Flange Cap Screw
Cummins®

The Studded Flange Cap Screw, identified by Part #3921816, is a component manufactured by Cummins, a well-established name in the automotive and heavy-duty truck industry. This part plays a significant role in heavy-duty truck applications, contributing to the secure assembly and reliable operation of various truck components.

Basic Concepts

A Studded Flange Cap Screw is a type of fastener that includes a threaded stud and a flanged head. The stud is designed to be inserted through holes in the components being joined, while the flange provides a broad surface area for distribution of clamping force. This design allows for efficient and secure fastening, ensuring that components remain firmly in place under operational stress ¹.

Role in Truck Operation

In the context of heavy-duty truck operations, the Studded Flange Cap Screw serves to secure and maintain the integrity of various components. It is commonly used in applications where high tensile strength and resistance to vibration are required. By providing a robust connection, it helps ensure that parts remain securely fastened, contributing to the overall reliability and safety of the truck ².

Key Features

The Studded Flange Cap Screw is characterized by several key features that enhance its performance and durability. Its design includes a threaded stud that allows for easy insertion and removal, while the flanged head provides a large surface area for distributing clamping force. The material composition typically includes high-strength steel, which offers excellent resistance to wear and corrosion. Additionally, the screw may feature unique attributes such as a coated surface to further improve durability and resistance to environmental factors.

Benefits

Using a Studded Flange Cap Screw offers several advantages. Its design contributes to improved reliability by providing a secure and stable connection between components. The ease of installation is another benefit, as the threaded stud allows for straightforward assembly. Furthermore, the screw’s enhanced load-bearing capabilities ensure that it can withstand the rigors of heavy-duty truck operations, contributing to the longevity and performance of the truck.

Installation Process

Proper installation of the Studded Flange Cap Screw is crucial for ensuring its effectiveness. The process involves inserting the threaded stud through the holes in the components being joined, followed by securing it with a nut. It is important to use the correct torque settings to achieve the desired clamping force without over-tightening, which could lead to damage. Alignment is also critical to ensure that the components are properly joined and that the screw functions as intended.

Maintenance and Troubleshooting

To ensure the longevity and optimal performance of the Studded Flange Cap Screw, regular maintenance is recommended. This includes periodic inspection for signs of wear or corrosion, and tightening as necessary to maintain the desired clamping force. Common issues may include loosening due to vibration or environmental factors, which can be addressed by re-torquing the screw to the specified settings. In cases of significant wear or damage, replacement may be necessary to maintain the integrity of the connection.

Safety Considerations

When working with the Studded Flange Cap Screw, it is important to observe several safety practices and precautions. Personal protective equipment (PPE) such as gloves and safety glasses should be worn to protect against injury. Safe handling procedures, including the use of appropriate tools and following torque specifications, are also critical to prevent accidents and ensure the screw is installed correctly.

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 strong reputation in the automotive and heavy-duty truck industry. The company’s product range includes a variety of components and systems designed to enhance the performance, reliability, and efficiency of vehicles. Cummins’ commitment to quality and innovation has made it a trusted name among professionals in the industry.

Studded Flange Cap Screw 3921816 Compatibility with Cummins Engines

The Studded Flange Cap Screw part number 3921816, manufactured by Cummins, is a critical component in the assembly and maintenance of various Cummins engines. This part is designed to secure flanges and other components in place, ensuring the integrity and functionality of the engine’s structure. Below is a detailed description of its compatibility with the listed Cummins engines:

B Series Engines

• B4.5, B4.5 CM2350 B129B
• B5.6 CM2670 B152B
• B5.9, B5.9 GAS PLUS CM556
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 G CMOH6.0 B125

The Studded Flange Cap Screw 3921816 is compatible with the B series engines, which include various configurations such as B4.5, B5.6, B5.9, and B6.7. These engines are known for their reliability and performance in various applications, and the studded flange cap screw plays a vital role in maintaining their structural integrity.

C Series Engines

• C GAS PLUS CM556

For the C series engines, specifically the C GAS PLUS CM556, the studded flange cap screw 3921816 is an essential component. It is used to secure flanges and other parts, ensuring that the engine operates smoothly and efficiently.

G Series Engines

• G8.3, G8.3 CM558
• GTA8.3 CM558

The G series engines, including the G8.3, G8.3 CM558, and GTA8.3 CM558, also benefit from the use of the studded flange cap screw 3921816. This part is crucial for maintaining the alignment and stability of the engine’s components, contributing to the overall performance and longevity of the engine.

F Series Engines

• F3.8 CM2350 F128C

The F3.8 CM2350 F128C engine is another application where the studded flange cap screw 3921816 is used. This part ensures that flanges and other critical components are securely fastened, which is essential for the engine’s proper functioning.

ISB Series Engines

• ISB (Chrysler)
• ISB CM2150
• ISB CM550
• ISB CM850
• ISB3.9 CM2220 B107
• ISB4.5 CM2350 B104
• ISB5.9 CM2880 B110

The ISB series engines, which include various configurations such as ISB, ISB3.9, ISB4.5, and ISB5.9, also utilize the studded flange cap screw 3921816. This part is integral to the assembly and maintenance of these engines, ensuring that all flanges and components are securely fastened and aligned.

By understanding the compatibility of the studded flange cap screw 3921816 with these Cummins engines, technicians and maintenance personnel can ensure that their engines are properly assembled and maintained, contributing to their overall performance and longevity.

Role of Part 3921816 Studded Flange Cap Screw in Engine Systems

The Part 3921816 Studded Flange Cap Screw is instrumental in securing and maintaining the integrity of various engine components. Its application spans across multiple systems, ensuring that each part functions optimally and remains securely in place.

Air Compressor Governor

In the air compressor governor system, the 3921816 Studded Flange Cap Screw is used to fasten the governor housing to the compressor body. This ensures that the governor operates within specified parameters, regulating air pressure effectively.

Air Intake Connection and Manifold

For the air intake connection and manifold, this screw plays a role in securing the intake components to the cylinder block. Proper fastening is essential to prevent air leaks, which could otherwise affect engine performance and efficiency.

Breather Tube and Crankcase Breather

In the breather tube and crankcase breather systems, the screw is utilized to attach the breather components to the cylinder block and other related parts. This helps in maintaining the pressure balance within the crankcase, ensuring smooth engine operation.

Cam Follower Cover Arrangement

The cam follower cover arrangement benefits from the secure attachment provided by the 3921816 screw. This ensures that the cover remains in place, protecting the cam followers and reducing the risk of contamination or damage.

Cylinder Block and Cover

Securing the cylinder block cover to the cylinder block is another application. This attachment is vital for maintaining the structural integrity of the engine and preventing coolant or oil leaks.

Engine Control Module (ECM)

In the ECM mounting, the screw ensures that the module is firmly attached to its housing. This is important for the stable operation of the engine’s electronic controls.

Exhaust Recirculation and Water Plumbing

For the exhaust recirculation system and its water plumbing, the screw is used to fasten components that manage the recirculation of exhaust gases. This helps in reducing emissions and improving engine efficiency.

Fuel Filter Plumbing and Injection Pump

In the fuel filter plumbing and fuel injection pump systems, the screw secures critical components, ensuring that fuel delivery is consistent and free from leaks.

Fuel System Accessories

Various fuel system accessories, such as lift pump conversion kits, rely on the 3921816 screw for secure attachment. This ensures that all components work in unison to deliver fuel efficiently.

Gear Cover Mounting

The gear cover, which protects the internal gearing of the engine, is mounted using this screw. This prevents any exposure to contaminants and ensures the longevity of the gear system.

Heat Shield

Heat shields are often attached using this screw to protect nearby components from excessive heat. Proper attachment is key to maintaining the thermal management of the engine.

Ignition System

Components of the ignition system, such as the throttle control mounting and throttle lever, are secured using the 3921816 screw. This ensures precise control over the engine’s ignition timing.

Oil Fill Arrangement and Pan

The oil fill arrangement and oil pan are critical for the engine’s lubrication system. The screw ensures that these components are securely in place, preventing oil leaks and maintaining proper lubrication.

Tube Brace and Wiring Accessories

Finally, tube braces and wiring accessories often require secure fastening to prevent movement and ensure the safety and reliability of the engine’s ancillary systems.

The 3921816 Studded Flange Cap Screw, therefore, plays a multifaceted role in ensuring the secure and efficient operation of various engine components.

Conclusion

The 3921816 Studded Flange Cap Screw is a critical component in the assembly and maintenance of Cummins engines, ensuring the secure and efficient operation of various engine components. Its compatibility with a wide range of Cummins engines, including B, C, G, F, and ISB series, underscores its importance in maintaining the structural integrity and performance of these engines. Proper installation, maintenance, and understanding of its role in different engine systems are essential for ensuring the longevity and reliability of heavy-duty trucks and other vehicles powered by Cummins engines.