4891120
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 4891120, is a component manufactured by Cummins, a well-established name in the commercial truck industry. This screw is integral to the assembly and maintenance of commercial trucks, ensuring secure fastening and reliable performance under various operational conditions.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and flanged base. The hexagonal head allows for efficient torque application using standard tools, while the flange provides additional surface area for distribution of clamping force. In a truck’s assembly, this screw is used to secure components that require both high tensile strength and resistance to loosening due to vibration ¹.

Purpose and Role in Truck Operation

The 4891120 Hexagon Flange Head Cap Screw plays a significant role in the operation and maintenance of commercial trucks. It is designed to fasten critical components that are subject to dynamic loads and vibrations. By providing a secure and stable connection, it helps maintain the integrity of the truck’s structure and ensures that components remain firmly in place during operation ².

Key Features

The 4891120 Hexagon Flange Head Cap Screw features a hexagonal head that facilitates easy and precise tightening using common tools. The flange at the base of the screw head enhances the distribution of clamping force, reducing the risk of component damage. Additionally, the screw is typically made from high-strength materials, ensuring durability and resistance to corrosion in harsh environments ³.

Benefits

Using the 4891120 Hexagon Flange Head Cap Screw offers several advantages. Its design enhances fastening security, making it less prone to loosening under vibration. The ease of installation and removal is another benefit, allowing for quick maintenance and repairs. Furthermore, the material composition ensures resistance to corrosion, contributing to a longer service life.

Installation Process

Proper installation of the 4891120 Hexagon Flange Head Cap Screw is vital for optimal performance. Begin by ensuring the mating surfaces are clean and free of debris. Use a torque wrench to apply the specified torque, ensuring the screw is tightened to the manufacturer’s recommendations. This step is crucial to avoid over-tightening, which can lead to damage, or under-tightening, which can compromise fastening security.

Maintenance and Care

Regular maintenance of the 4891120 Hexagon Flange Head Cap Screw is necessary to prevent issues such as corrosion and loosening. Inspect the screw periodically for signs of wear or damage. Applying a corrosion-resistant coating can help protect the screw from environmental factors. Additionally, re-torque the screw at recommended intervals to ensure it remains securely fastened.

Troubleshooting Common Issues

Common problems with the 4891120 Hexagon Flange Head Cap Screw include loosening and corrosion. If loosening is detected, re-torque the screw to the specified value. For corrosion, clean the affected area and apply a protective coating. In cases where the screw is damaged, replacement may be necessary to maintain the integrity of the fastening.

Cummins: A Brief 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 for quality and reliability in the commercial truck industry. Their product range includes a variety of components and systems designed to enhance the performance and durability of commercial vehicles.

Cummins Engine Compatibility with Part 4891120

The Hexagon Flange Head Cap Screw, part number 4891120, manufactured by Cummins, is a critical component in various engine assemblies. This part is designed to secure different engine parts, ensuring structural integrity and operational efficiency.

B6.7 Series Engines

• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7S

The B6.7 series engines utilize the Hexagon Flange Head Cap Screw in several key areas, primarily for securing the cylinder heads and other critical engine components. This ensures that the engine maintains its structural integrity under high-pressure conditions.

F3.8 Series Engines

• F3.8 CM2350 F120B
• F3.8 CM2620 F137B
• F4.5 CM2620 F139B

In the F3.8 series engines, the part 4891120 is used to fasten various components, including the valve covers and other critical parts. This helps in maintaining the engine’s operational efficiency and durability.

ISB Series Engines

• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN

The ISB series engines incorporate the Hexagon Flange Head Cap Screw in securing the engine block and other major components. This ensures that the engine can withstand the rigors of heavy-duty operations.

ISBE Series Engines

• ISBE CM2150
• ISBE CM800
• ISBE4 CM850

The ISBE series engines use the part 4891120 to secure the cylinder heads and other critical engine parts. This helps in maintaining the engine’s structural integrity and operational efficiency.

ISF Series Engines

• ISF3.8 CM2220 AN
• ISF3.8 CM2220 F103
• ISF3.8 CM2350 F109
• ISF4.5 CM2220 F123

In the ISF series engines, the Hexagon Flange Head Cap Screw is used to fasten various components, including the valve covers and other critical parts. This ensures that the engine can operate efficiently under various conditions.

ISG Series Engines

• ISG11 CM2880 G108
• ISG12 CM2880 G107
• ISG12 G CMOH6.0 G111

The ISG series engines utilize the part 4891120 to secure the engine block and other major components. This helps in maintaining the engine’s structural integrity and operational efficiency.

ISM Series Engines

• ISM CM570
• ISM CM570/870

The ISM series engines incorporate the Hexagon Flange Head Cap Screw in securing the engine block and other critical components. This ensures that the engine can withstand the rigors of heavy-duty operations.

M11 Celect Plus

The M11 Celect Plus engine uses the part 4891120 to secure various components, ensuring the engine’s structural integrity and operational efficiency.

QSB Series Engines

• QSB4.5 CM850(CM2850)
• QSB5.9 CM550

The QSB series engines utilize the Hexagon Flange Head Cap Screw in securing the engine block and other critical components. This ensures that the engine can withstand the rigors of heavy-duty operations.

Role of Part 4891120 Hexagon Flange Head Cap Screw in Engine Systems

The part 4891120 Hexagon Flange Head Cap Screw is instrumental in securing various components within engine systems, ensuring their stability and proper function.

Drive and Water Pump

In the drive and water pump assembly, this screw plays a significant role in fastening the water pump to the engine block. It ensures that the water pump remains securely attached, allowing for efficient coolant circulation which is vital for maintaining optimal engine temperature.

Idler Pulley and Lever

For the idler pulley and lever mechanisms, the Hexagon Flange Head Cap Screw is used to secure the idler pulley to its mounting bracket. This secure attachment is essential for maintaining the correct tension on the drive belts, which in turn ensures smooth operation of ancillary components like the alternator and water pump.

Rocker and Location

Within the rocker top-level assembly lever, this screw is employed to fasten the rocker arms to their respective pivot points. Proper attachment is necessary for the accurate movement of the rocker arms, which directly influences valve operation and engine performance.

Refrigerant Compressor and Pulley

In the refrigerant compressor assembly, the screw is utilized to secure the pulley to the compressor shaft. This ensures that the pulley remains aligned and securely attached, facilitating the transfer of rotational force from the engine to the compressor.

Water Pump Drive and Pump

For the water pump drive and pump components, the Hexagon Flange Head Cap Screw is critical in attaching the water pump drive pulley to the water pump itself. This secure connection is necessary for the efficient transfer of rotational energy, ensuring that the water pump operates correctly and maintains proper coolant flow.

Mounting and Alternator

In the alternator mounting system, this screw is used to fasten the alternator to its mounting bracket. A secure attachment is vital for the alternator’s stable operation, which is essential for generating electrical power to charge the battery and power the vehicle’s electrical systems.

Conclusion

Overall, the part 4891120 Hexagon Flange Head Cap Screw is a fundamental component in ensuring the secure and efficient operation of various engine system parts. Its design and material composition make it a reliable choice for fastening critical components in commercial trucks, contributing to the overall performance and durability of the vehicle.