3089366
Hexagon Flange Head Cap Screw
Cummins®

The Cummins Hexagon Flange Head Cap Screw (Part #3089366) is a specialized fastener designed for use in commercial trucks. This article provides an in-depth look at the design, function, and application of this part within the context of heavy-duty truck maintenance and operation.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt characterized by a hexagonal head and a flanged base. The hexagonal head allows for efficient torque application using standard tools, while the flange provides additional surface area to distribute load and prevent the screw from sinking into softer materials.

Function and Application

This Cummins part plays a role in securing various components within a truck’s engine and chassis. It is commonly used in applications where a combination of high tensile strength and resistance to loosening is required. This screw is often found in engine mounts, bracketry, and other assemblies.

Key Features

• Hexagonal head for easy tool engagement.
• Flanged base to distribute load and prevent sinking.
• Manufactured from high-tensile steel to ensure durability under stress.
• Zinc-plated or otherwise coated to provide corrosion resistance.

Benefits

The design of the 3089366 offers several advantages, including enhanced resistance to vibration-induced loosening, improved load distribution, and ease of installation and removal. The corrosion-resistant coating extends the service life of the screw in various operating environments.

Troubleshooting and Maintenance

Regular inspection of Hexagon Flange Head Cap Screws is recommended to ensure they remain tight and free of corrosion. If a screw shows signs of loosening or damage, it should be replaced promptly to maintain the integrity of the assembly it secures. Proper torque specifications should be followed during installation to avoid over-tightening or under-tightening ¹.

Cummins Engines Utilizing the Hexagon Flange Head Cap Screw

The Cummins Hexagon Flange Head Cap Screw (part 3089366) is utilized in various Cummins engine models to ensure secure fastening solutions. Below are the Cummins engines where this screw is used, grouped by model series for clarity.

Cummins 6 Series Engines

• 6B5.9
• 6C8.3

These engines, part of the 6 Series, are known for their robust performance and reliability. The 3089366 screw is integral in maintaining the integrity of the engine’s components, ensuring that parts such as covers and housings are fastened securely.

Cummins B and QSK Series Engines

• B6.7 CM2670 B153B
• QSB6.7 CM850 (CM2850)
• QSK45 CM500
• QSK60 CM500
• QSK78 CM500

The B and QSK series engines are designed for heavy-duty applications, and the 3089366 screw plays a vital role in these engines by providing the necessary fastening for various components. Its flange head design ensures a strong grip, which is crucial for the demanding environments these engines operate in.

Cummins ISX Series Engines

• ISX12 CM2350 X102
• ISX12 G CM2180 EJ
• ISX12/ISX11.9 CM2250

The ISX series engines are known for their high performance and efficiency. The 3089366 screw is used in these engines to secure components that are subject to high stress and vibration, ensuring that the engine maintains its structural integrity and operational efficiency.

Cummins QSM and QSX Series Engines

• QSM11 CM570
• QSX11.9 CM2250 ECF

In the QSM and QSX series engines, the 3089366 screw is used to fasten various components, ensuring that the engine’s parts remain securely in place. This is particularly important in these engines, which are designed for both performance and durability.

Usage in Engine Systems

The Hexagon Flange Head Cap Screw (part 3089366) is a versatile fastener utilized in various engine systems to ensure secure and reliable connections. Its application spans across multiple components, enhancing the overall integrity and performance of the engine.

Air Cleaner and Air Cleaner Bracket

In the air cleaner system, the Hexagon Flange Head Cap Screw is employed to fasten the air cleaner bracket securely to the engine. This ensures that the air cleaner remains in the correct position, allowing for optimal airflow into the engine. Proper attachment is essential for maintaining the efficiency of the air filtration process, which directly impacts engine performance.

Cylinder Block and Cylinder Block Kit

Within the cylinder block and cylinder block kit, these screws are used to secure various components such as sensors, brackets, and auxiliary parts. Their robust design ensures that these elements remain firmly in place, even under the high vibrations and stresses experienced during engine operation. This stability is vital for the precise functioning of the cylinder block components.

Fan Drive and Flywheel Housing

For the fan drive and flywheel housing, the Hexagon Flange Head Cap Screw plays a significant role in maintaining the alignment and secure attachment of these components. In the fan drive system, it ensures that the fan remains correctly positioned to provide adequate cooling. In the flywheel housing, it helps in securing the flywheel and associated components, which are critical for the smooth operation of the engine.

Front Engine Support and Fuel Control Module

In the front engine support system, these screws are used to fasten the support brackets, ensuring that the engine is securely mounted within the vehicle’s frame. For the fuel control module, they are essential in attaching the module to the engine, guaranteeing that the fuel delivery system operates efficiently and reliably.

Ignition System and Oil Pan

In the ignition system, the Hexagon Flange Head Cap Screw is utilized to secure ignition components such as coils and brackets, ensuring consistent spark delivery. For the oil pan, these screws are crucial in attaching the pan to the engine block, providing a secure seal that prevents oil leaks and maintains proper lubrication.

Power Take-Off Assembly and Refrigerant Compressor

Within the power take-off assembly, these screws ensure that all connected components are securely fastened, allowing for the efficient transfer of power. In the refrigerant compressor, they are used to attach the compressor to the engine, ensuring stable and reliable operation of the air conditioning system.

Rocker Lever and Transmission

For the rocker lever system, the Hexagon Flange Head Cap Screw is employed to secure the levers and associated brackets, ensuring precise valve operation. In the transmission, these screws are used to fasten various housing and mounting components, contributing to the overall stability and performance of the transmission system.

Conclusion

The Cummins Hexagon Flange Head Cap Screw (part 3089366) is a critical component in various Cummins engine models, ensuring secure fastening solutions across multiple engine systems. Its robust design and corrosion-resistant coating make it ideal for heavy-duty applications, contributing to the overall integrity and performance of the engine.