3936683
Hexagon Flange Head Cap Screw
Cummins®

Introduction to Hexagon Flange Head Cap Screws

Hexagon flange head cap screws are indispensable fasteners used across various industries, particularly in commercial truck manufacturing. These screws are characterized by their hexagonal head, which facilitates easy tightening and loosening using a wrench or socket. The flange beneath the head offers a broad bearing surface, effectively distributing the load and minimizing the risk of damage to the fastened materials.

The Role of the 3936683 Hexagon Flange Head Cap Screw in Truck Engines

The 3936683 hexagon flange head cap screw, produced by Cummins, is engineered specifically for truck engines. This screw is instrumental in securing various engine components, ensuring they remain firmly fastened and correctly aligned. Its reliable and secure connection significantly contributes to the engine’s overall performance and durability ¹.

How the 3936683 Hexagon Flange Head Cap Screw Works

The 3936683 hexagon flange head cap screw functions by threading into a pre-tapped hole in the engine component. Once inserted, the screw is tightened using a wrench or socket that engages with the hexagonal head. The flange under the head then presses against the component’s surface, creating a stable and secure connection. This design allows for straightforward installation and removal, making it suitable for high-stress environments like truck engines.

Importance of Proper Installation and Maintenance

Correct installation and maintenance of the 3936683 hexagon flange head cap screw are critical for optimal performance and longevity. It is vital to adhere to the correct torque specifications during installation to prevent over-tightening or under-tightening. Over-tightening can damage the engine component, while under-tightening may lead to a loose connection and potential engine failure ².

Regular maintenance involves inspecting the screw for signs of wear, corrosion, or damage. If any issues are detected, the screw should be replaced promptly to avoid engine problems. Additionally, using the appropriate lubricants and cleaning agents during maintenance ensures the screw remains in good condition.

Troubleshooting Common Issues

Engineers and mechanics may encounter several common issues when working with the 3936683 hexagon flange head cap screw. A stripped screw can occur due to over-tightening or using the wrong size wrench or socket. In such cases, the screw should be removed and replaced with a new one.

Another frequent issue is a loose connection, which can result from under-tightening or corrosion. To address this, the screw should be re-tightened to the correct torque specifications, and any corroded areas should be cleaned and lubricated.

Cummins: A Leader in Truck Engine Manufacturing

Cummins is a distinguished manufacturer of truck engines and related components, renowned for its high-quality and reliable products. The company’s long history of innovation and excellence in the automotive industry makes it a trusted source for engineers, mechanics, and fleet operators. Using Cummins-manufactured parts like the 3936683 hexagon flange head cap screw ensures engines are well-maintained and perform optimally ³.

Cummins Engine Compatibility with Part 3936683

The Hexagon Flange Head Cap Screw, part number 3936683, manufactured by Cummins, is a versatile component that fits into various engine models. This screw is designed to provide secure fastening in applications requiring robust and reliable connections.

Cummins 4B3.9 and 6B5.9 Engines

The 4B3.9 and 6B5.9 engines benefit from the use of the 3936683 screw in several applications. These engines, known for their durability and performance, often require precise fastening solutions to maintain structural integrity and operational efficiency. The screw’s design ensures that it can withstand the stresses and vibrations typical in these engine environments.

Cummins 6C8.3 and L8.9 Engines

Similarly, the 6C8.3 and L8.9 engines incorporate the 3936683 screw in their assembly. These engines are part of Cummins’ lineup of high-performance diesel engines, and the screw’s ability to provide a tight, secure fit is crucial for maintaining the alignment and stability of engine components.

Cummins ISB/ISD4.5 CM2150 B119 and ISD4.5 CM2220 D108 Engines

The ISB/ISD4.5 CM2150 B119 and ISD4.5 CM2220 D108 engines also utilize the 3936683 screw. These engines are known for their versatility and efficiency, and the screw’s design supports the rigorous demands of these applications. Its use in these engines ensures that critical components remain securely fastened, contributing to the overall reliability and performance of the engine.

Cummins ISBE4 CM850 and QSB4.5 CM850 (CM2850) Engines

The ISBE4 CM850 and QSB4.5 CM850 (CM2850) engines are another set of Cummins engines that integrate the 3936683 screw. These engines are designed for a range of applications, from industrial to transportation, and the screw’s robust construction is ideal for these demanding environments. Its use in these engines helps maintain the precision and durability required for optimal engine performance.

Role of Part 3936683 Hexagon Flange Head Cap Screw in Engine Systems

The Hexagon Flange Head Cap Screw, identified by part number 3936683, is integral in securing various components within engine systems. Its application spans across multiple assemblies, ensuring stability and integrity of the engine’s operation.

Fuel Shut-Off Systems

In the 4-cylinder 24V fuel shut-off kit, the Hexagon Flange Head Cap Screw is used to fasten the fuel shutoff valve. This ensures that the valve remains securely in place, allowing for precise control over fuel delivery to the engine. Similarly, in the BB 12V and 24V fuel shutoff kits, as well as the Chrysler and Ford fuel shutoff kits, this screw plays a role in maintaining the structural integrity of the shutoff mechanisms.

Electronic Control Modules

Within the electronic control module (ECM) wiring harness, the Hexagon Flange Head Cap Screw is employed to secure the housing of the ECM. This is vital for protecting the sensitive electronic components from environmental factors and ensuring that the connections remain stable during engine operation.

Flywheel Housing

The flywheel housing, a critical component in the engine’s power transmission, utilizes the Hexagon Flange Head Cap Screw to attach the housing to the engine block. This secure attachment is essential for maintaining the alignment and operational efficiency of the flywheel.

Oil Level Gauge

In the oil level gauge assembly, the screw is used to fasten the gauge to its mounting point. This ensures that the gauge remains firmly in place, providing accurate readings of the engine’s oil level, which is essential for maintaining proper lubrication.

Thermostat Housing

The thermostat housing, which regulates the engine’s cooling system, also benefits from the use of the Hexagon Flange Head Cap Screw. It secures the housing to the engine, ensuring that the thermostat operates within its designed parameters, contributing to the engine’s thermal management.

Exhaust Recirculation Systems

In exhaust recirculation systems, particularly those involving water recirculation, the screw is used to attach plumbing components and housings. This secure attachment is necessary for the efficient recirculation of exhaust gases, which helps in reducing emissions and improving engine performance.

Fuel Shutoff Valve

The fuel shutoff valve, a component found in various fuel shutoff kits, relies on the Hexagon Flange Head Cap Screw to ensure it is tightly secured. This is important for the valve’s function in safely cutting off fuel supply in emergency situations or during maintenance.

Wiring Accessories

Lastly, in the realm of wiring accessories, the screw is used to secure various harnesses and connections. This ensures that all electrical components are reliably connected, minimizing the risk of loose connections that could lead to malfunctions or failures.

Conclusion

The 3936683 hexagon flange head cap screw is a critical component in truck engines, providing a secure and stable connection for various engine parts. By understanding the fundamental concepts, purpose, and maintenance requirements of this screw, engineers, mechanics, and fleet operators can ensure their engines remain in optimal condition, leading to enhanced performance and longevity.