3904987
Hexagon Flange Head Cap Screw
Cummins®

Introduction To Hexagon Flange Head Cap Screws

Hexagon flange head cap screws, also known as hexagon flange bolts, are a type of fastener characterized by a hexagonal head and a flanged neck. These screws are designed to provide a secure and stable connection between two or more parts, making them essential in various applications, including commercial truck engines. The flange provides a larger bearing surface, distributing the load more evenly and reducing the risk of damage to the fastened parts. Their robust design ensures they can withstand significant stress and high temperatures, making them ideal for critical engine applications ¹.

The Role Of A Hexagon Flange Head Cap Screw In Truck Engines

Hexagon flange head cap screws play a crucial role in truck engines by ensuring the secure attachment of various components. These screws are used to fasten engine parts such as cylinder heads, valve covers, and intake manifolds. Their design allows for easy installation and removal, making them ideal for maintenance and repair tasks. The flange head provides a larger surface area for torque application, ensuring a tight and reliable connection. This is particularly important in heavy-duty truck engines, where components are subjected to extreme conditions and require a secure fastening solution to maintain engine integrity and performance ².

Purpose Of The 3904987 Hexagon Flange Head Cap Screw

The 3904987 hexagon flange head cap screw by Cummins is specifically engineered for use in heavy-duty truck engines. This screw is designed to withstand the high stresses and temperatures encountered in engine environments. Its robust construction ensures durability and longevity, reducing the need for frequent replacements and minimizing downtime. The screw’s precise tolerances and high-quality materials make it a reliable choice for critical engine applications. The 3904987 model is particularly noted for its ability to maintain a secure connection under extreme conditions, ensuring the longevity and reliability of the engine components it fastens ³.

Installation And Maintenance Of The 3904987 Hexagon Flange Head Cap Screw

Proper installation and maintenance of the 3904987 hexagon flange head cap screw are essential to ensure optimal performance and longevity. When installing the screw, it is important to use the correct torque specifications to avoid over-tightening or under-tightening. Over-tightening can cause damage to the screw or the fastened parts, while under-tightening can result in a loose connection, leading to potential engine failure.

Regular maintenance of the 3904987 hexagon flange head cap screw involves inspecting the screw for signs of wear, corrosion, or damage. If any issues are detected, the screw should be replaced promptly to prevent further problems. Additionally, it is important to use the correct lubricants and sealants when installing the screw to ensure a proper seal and prevent leaks. Following these maintenance practices will help ensure the screw remains in optimal condition, contributing to the overall reliability of the engine ¹.

Troubleshooting Common Issues With The 3904987 Hexagon Flange Head Cap Screw

Despite their durability, hexagon flange head cap screws can encounter issues that require troubleshooting. Common problems include stripped threads, corrosion, and improper torque. If a screw is found to have stripped threads, it should be replaced immediately to avoid further damage. Corrosion can be prevented by using corrosion-resistant materials and applying protective coatings. Improper torque can be addressed by using the correct torque specifications and tools during installation. Regular inspections and adherence to maintenance guidelines can help mitigate these issues, ensuring the continued reliability of the screw and the engine it supports ².

Cummins: A Leader In Truck Engine Components

Cummins is a renowned manufacturer of truck engines and related components, known for its high-quality and reliable products. The company has a long history of innovation and excellence in the automotive industry, providing components that meet the demanding requirements of heavy-duty applications. Cummins’ commitment to quality and performance ensures that its hexagon flange head cap screws, including the 3904987 model, are designed to deliver exceptional results in truck engines. Their products are engineered to withstand the rigors of heavy-duty use, providing peace of mind to mechanics, engineers, and fleet operators ³.

Hexagon Flange Head Cap Screw (Part 3904987) Compatibility with Cummins Engines

The Hexagon Flange Head Cap Screw, part number 3904987, manufactured by Cummins, is a versatile component that fits a wide range of Cummins engines. This screw is designed to secure various parts and assemblies within the engine, ensuring stability and integrity during operation. Below is a detailed breakdown of the engines with which this part is compatible.

Cummins B Series Engines

• B4.5
• B5.9
• B5.9 G
• B5.9 GAS PLUS CM556

These engines, part of the B series, are typically used in medium-duty applications and benefit from the secure fastening provided by the 3904987 screw.

Cummins C Series Engines

• C GAS PLUS CM556
• C8.3 G

The C series engines, known for their reliability in heavy-duty applications, also utilize the 3904987 screw for critical fastening tasks.

Cummins ISB Series Engines

• ISB CM2150
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118
• ISX12/ISX11.9 CM2250

The ISB series engines are widely used in both on-highway and off-highway applications. The 3904987 screw is integral to maintaining the structural integrity of these engines.

Cummins ISL Series Engines

• ISL G CM2180
• ISL9 CM2150 SN

The ISL series engines, known for their performance in heavy-duty applications, also rely on the 3904987 screw for various assembly and fastening needs.

Cummins ISBE Series Engines

• ISBE CM800
• ISBE4 CM850

These engines, often used in vocational applications, benefit from the secure fastening provided by the 3904987 screw.

Cummins ISX Series Engines

• ISX CM570
• ISX CM870
• ISX CM871
• ISX12 CM2350 X102
• ISX12 G CM2180 EJ

The ISX series engines, known for their high performance and durability, also utilize the 3904987 screw in various critical applications.

The 3904987 Hexagon Flange Head Cap Screw is a critical component in ensuring the reliability and performance of these Cummins engines. Its compatibility across a wide range of engine models underscores its versatility and importance in engine assembly and maintenance.

Role of Part 3904987 Hexagon Flange Head Cap Screw in Engine Systems

The part 3904987 Hexagon Flange Head Cap Screw is integral to the secure assembly and operation of various engine components. Its robust design ensures reliable fastening in high-stress environments, contributing to the overall efficiency and durability of the engine system.

Aftercooler

In the aftercooler system, the Hexagon Flange Head Cap Screw is used to fasten components that facilitate the cooling of compressed air. This ensures that the air is at an optimal temperature before entering the engine, enhancing performance and efficiency.

Alternator Location

At the alternator location, this screw plays a role in securing the alternator to the engine block. This is essential for maintaining the electrical integrity of the engine system, ensuring consistent power supply to various components.

Arrangement - Thermostat Housing

Within the thermostat housing arrangement, the screw is employed to secure the housing to the engine. This is vital for maintaining the proper flow of coolant, which is crucial for regulating engine temperature.

Arrangement - Turbocharger

In the turbocharger arrangement, the screw is used to fasten components that manage the flow of exhaust gases and compressed air. This ensures that the turbocharger operates efficiently, contributing to increased engine power and performance.

Compressor - Refrigerant

For the refrigerant compressor, the screw is utilized to secure components that handle the compression and circulation of refrigerant. This is important for maintaining the efficiency of the cooling system within the engine.

Connection - Water Outlet

At the water outlet connection, the screw ensures a secure fit, preventing leaks and maintaining the integrity of the coolant system. This is essential for consistent engine temperature regulation.

Cover - Hand Hole

The hand hole cover, which provides access to internal engine components, is secured using this screw. This ensures that the cover remains in place during operation, protecting internal parts from contaminants.

Drive - Fan

In the fan drive system, the screw is used to secure the fan to its mounting bracket. This is important for ensuring that the fan operates smoothly, contributing to effective engine cooling.

Filter - Fuel

For the fuel filter, the screw is employed to secure the filter housing. This ensures that the filter remains in place, allowing for effective filtration of fuel before it reaches the engine.

Injection Timing Kit

Within the injection timing kit, the screw is used to secure components that control the timing of fuel injection. This is important for optimizing engine performance and fuel efficiency.

Lubricating Oil Filter Head

The lubricating oil filter head is secured using this screw, ensuring that the filter remains in place and functions effectively. This is vital for maintaining the quality of the engine’s lubricating oil.

Lubricating Oil Filter Top Level Assembly Head

In the top level assembly of the lubricating oil filter, the screw ensures that all components are securely fastened. This is important for the overall efficiency of the oil filtration system.

Manifold - Air Intake

The air intake manifold is secured using this screw, ensuring that it remains in place and functions effectively. This is important for maintaining the proper flow of air into the engine.

Module - Engine Control

Within the engine control module, the screw is used to secure components that manage the engine’s electronic systems. This is vital for the overall control and performance of the engine.

Module - Fuel Control

In the fuel control module, the screw ensures that components are securely fastened. This is important for maintaining the efficiency of the fuel control system.

Mounting - Refrigerant Compressor

The refrigerant compressor is mounted using this screw, ensuring that it remains in place and operates efficiently. This is vital for the proper functioning of the engine’s cooling system.

Plumbing - Charge Air Bypass

Within the charge air bypass plumbing, the screw is used to secure components that manage the flow of air. This is important for maintaining the efficiency of the air bypass system.

Pump - Fuel

The fuel pump is secured using this screw, ensuring that it remains in place and operates effectively. This is vital for maintaining the proper flow of fuel to the engine.

Pump - Water

In the water pump system, the screw ensures that the pump is securely fastened. This is important for maintaining the efficiency of the coolant circulation system.

Service Kit

Within the service kit, the screw is used to secure various components that are essential for engine maintenance and repair. This ensures that all parts are securely in place during service procedures.

Spacer - Fan Pilot

The fan pilot spacer is secured using this screw, ensuring that the fan operates smoothly and efficiently. This is important for maintaining effective engine cooling.

Tensioner - Belt

The belt tensioner is secured using this screw, ensuring that the belt remains properly tensioned. This is vital for the efficient operation of various engine components.

Thermostat Housing

The thermostat housing is secured using this screw, ensuring that it remains in place and functions effectively. This is important for maintaining the proper flow of coolant and regulating engine temperature.

Thermostat Top Level Assembly Housing

In the top level assembly of the thermostat housing, the screw ensures that all components are securely fastened. This is vital for the overall efficiency of the thermostat system.

Conclusion

The 3904987 Hexagon Flange Head Cap Screw by Cummins is a critical component in ensuring the reliability and performance of heavy-duty truck engines. Its robust design, precise tolerances, and high-quality materials make it a reliable choice for critical engine applications. Proper installation, maintenance, and troubleshooting practices are essential to ensure the longevity and reliability of this Cummins part. By understanding the role and importance of the 3904987 screw, engineers, mechanics, and fleet operators can ensure the optimal performance and durability of their truck engines.