3678923
Threaded Plug
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3678923, is a component manufactured by Cummins, a well-established name in the automotive and heavy-duty truck industry. This screw is significant in commercial trucks due to its robust design and reliable performance, contributing to the overall efficiency and durability of truck components.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and a flange beneath the head. 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 the material. In a truck’s mechanical system, these screws are used to secure various components, ensuring they remain firmly in place under operational stress.

Purpose and Role in Truck Operation

This Cummins part plays a role in the operation of a commercial truck by securing critical components such as engine parts, chassis elements, and other structural assemblies. Its applications range from fastening engine covers to securing brackets and plates within the truck’s framework. The screw’s design ensures that these components remain stable and intact, contributing to the truck’s overall performance and safety.

Key Features

The 3678923 features a hexagonal head that facilitates easy and precise torque application. The flange beneath the head provides additional bearing surface, which helps in distributing the load more evenly and preventing the screw from embedding into the material. The screw is typically made from high-strength materials, ensuring it can withstand significant stress and corrosion, which are common in the demanding environment of commercial trucking.

Benefits

This part offers several benefits. Its durable material composition enhances its longevity, making it suitable for long-term use in heavy-duty applications. The design of the screw allows for improved torque application, ensuring that components are securely fastened. Additionally, the flange feature provides resistance to loosening, which is crucial in maintaining the integrity of truck components over time.

Installation and Usage

Proper installation of the 3678923 involves using the correct torque settings to ensure the screw is tightened to the manufacturer’s specifications. This typically requires a torque wrench to achieve the precise torque value, which helps prevent over-tightening or under-tightening. Best practices include cleaning the installation surface to remove any debris or corrosion, ensuring a secure and lasting connection.

Troubleshooting and Maintenance

Common issues with the 3678923 may include loosening due to vibration or corrosion. Regular inspections can help identify these issues early. Maintenance tips include periodically checking the torque of the screws and reapplying anti-seize compound if necessary to prevent corrosion. If corrosion is detected, cleaning the affected area and replacing the screw may be necessary to maintain performance and safety.

Cummins Overview

Cummins is a reputable manufacturer with a long-standing history in the automotive and heavy-duty truck industry. Known for their commitment to quality and innovation, Cummins produces a wide range of components that are designed to meet the rigorous demands of commercial trucking. Their reputation is built on a foundation of reliable products, advanced engineering, and a dedication to customer satisfaction, making them a trusted name in the industry.

Hexagon Flange Head Cap Screw 3678923 Compatibility with Cummins Engines

The Cummins Hexagon Flange Head Cap Screw part number 3678923 is a versatile component designed to fit a variety of Cummins engines. This screw is engineered to provide a secure fastening solution, ensuring that engine components remain tightly secured during operation. Below is a detailed description of its compatibility with various Cummins engines:

15N CM2380 M104B

The 3678923 screw is compatible with the 15N CM2380 M104B engine, providing a reliable fastening option for securing various engine components.

4B3.9, 6B5.9, 6C8.3

This screw fits seamlessly with the 4B3.9, 6B5.9, and 6C8.3 engines, ensuring that critical parts are held firmly in place, contributing to the engine’s overall stability and performance.

B3.3, B3.9 G, B4.5, B4.5 RGT

The 3678923 screw is also suitable for the B3.3, B3.9 G, B4.5, and B4.5 RGT engines. Its design allows for easy installation and removal, making it an ideal choice for these engine models.

B5.9 CM2670 B166C, B5.9 G, B5.9 GAS PLUS CM556

For the B5.9 CM2670 B166C, B5.9 G, and B5.9 GAS PLUS CM556 engines, the 3678923 screw provides a robust fastening solution, ensuring that engine components are securely fastened.

B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, B6.7S

The 3678923 screw is compatible with the B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, and B6.7S engines. Its design ensures that these engines’ components are held securely, contributing to the engine’s longevity and performance.

C GAS PLUS CM556

The 3678923 screw is also suitable for the C GAS PLUS CM556 engine, providing a reliable fastening option for securing various engine components.

D4.0 CM2620 D103B

This screw fits the D4.0 CM2620 D103B engine, ensuring that critical parts are held firmly in place, contributing to the engine’s overall stability and performance.

G5.9, G5.9 CM558, G8.3, G8.3 CM558, GTA8.3 CM558

The 3678923 screw is compatible with the G5.9, G5.9 CM558, G8.3, G8.3 CM558, and GTA8.3 CM558 engines. Its design allows for easy installation and removal, making it an ideal choice for these engine models.

ISB (Chrysler), ISB CM2150

Lastly, the 3678923 screw is suitable for the ISB (Chrysler) and ISB CM2150 engines, providing a robust fastening solution that ensures engine components are securely fastened.

Role of Part 3678923 Hexagon Flange Head Cap Screw in Engine Systems

The part 3678923 Hexagon Flange Head Cap Screw is integral 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.

Accessory Drive Pulley

In the accessory drive pulley system, the Hexagon Flange Head Cap Screw is used to fasten the pulley to the engine block. This secure attachment ensures that the pulley operates smoothly, driving essential accessories like the alternator and water pump.

Aftercooler and Aftercooler Assembly (Left Bank)

For the aftercooler and its assembly on the left bank, these screws play a role in mounting the aftercooler to the engine block. Proper fastening is essential for efficient cooling of the compressed air, which is vital for engine performance and longevity.

Air Compressor Support

The air compressor support structure relies on these screws to maintain its position and alignment. This is important for the efficient operation of the air compressor, which is a key component in the engine’s air supply system.

Assembly Aftercooler

In the assembly of the aftercooler, these screws are used to secure various components together, ensuring a leak-free and robust assembly that can withstand the pressures and temperatures of the engine environment.

Block and Short E2 Incent

These screws are employed in the block and short E2 incent to secure critical components, ensuring that the engine block remains structurally sound and that all connections are tight and secure.

Cylinder Block Hardware Kit

Within the cylinder block hardware kit, these screws are used to fasten various hardware components to the cylinder block, ensuring that all parts are securely in place and function as intended.

Cylinder Block Lubrication Plumbing

For the cylinder block lubrication plumbing, these screws help in securing the plumbing components, ensuring that the lubrication system operates efficiently and that oil is distributed correctly throughout the engine.

Cylinder (Top Level Assembly) Head

In the cylinder head assembly, these screws are used to secure the head to the block, ensuring a proper seal and alignment, which is essential for combustion efficiency and engine performance.

Engineering Cooler Leak Test Kit

During the use of the engineering cooler leak test kit, these screws may be employed to secure test equipment to the engine, ensuring accurate and reliable leak testing.

Filter, Fuel

In the fuel filter system, these screws are used to secure the filter housing, ensuring that the fuel system remains clean and free from contaminants.

Fluid Doser

For the fluid doser system, these screws secure the doser to the engine, ensuring precise fluid dosing for optimal engine operation.

Front Gear Housing

In the front gear housing, these screws are used to secure the housing to the engine, ensuring that the gear system operates smoothly and efficiently.

Fuel Control Housing

These screws are crucial in securing the fuel control housing, ensuring that the fuel control system functions accurately and reliably.

Gear Fuel Pump

In the gear fuel pump system, these screws secure the pump to the engine, ensuring efficient fuel delivery.

Injector Plumbing

For the injector plumbing, these screws are used to secure the plumbing components, ensuring that fuel is delivered to the injectors without leaks or restrictions.

Intake Manifold (Right) Assembly

In the intake manifold assembly on the right, these screws secure the manifold to the engine, ensuring proper air intake and engine performance.

Kit, ISC/ISL Certification and Kit, MR Certification

These screws are used in certification kits to secure testing and measurement equipment, ensuring accurate and reliable certification processes.

Service Block

In the service block, these screws are used to secure various components, facilitating easier maintenance and service procedures.

Short 6-B Block and Short Block 6Cart

These screws are employed in the short 6-B block and short block 6Cart to secure components, ensuring structural integrity and proper function.

Tube Connector Tee

For the tube connector tee, these screws secure the tee to the plumbing system, ensuring a leak-free and robust connection.

Turbocharger Plumbing

In the turbocharger plumbing system, these screws secure the plumbing components, ensuring efficient turbocharger operation and engine performance.

XPI JV System Cummins MR

Finally, in the XPI JV system for Cummins MR engines, these screws are used to secure various components, ensuring the system operates efficiently and reliably.

Conclusion

The 3678923 Hexagon Flange Head Cap Screw is a critical component in the maintenance and operation of Cummins engines and commercial trucks. Its robust design, reliable performance, and compatibility with a wide range of Cummins engines make it an essential part for securing various engine components. Proper installation, regular maintenance, and understanding its role in different engine systems are key to ensuring the longevity and efficiency of truck components.