3904217
Hexagon Head Cap Screw
Cummins®

The Hexagon Head Cap Screw, Part #3904217 by Cummins, is a critical component in commercial truck applications. This screw ensures secure fastening in various truck components, contributing to the structural integrity and operational reliability of the vehicle. Understanding its role and significance is essential for maintaining and repairing commercial trucks effectively.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a fastener characterized by its hexagonal head, which allows for efficient tool engagement. This design facilitates the application of torque with wrenches or socket tools, ensuring precise tightening or loosening. The hexagonal shape prevents the tool from slipping off the screw head, which is particularly advantageous in high-torque applications. These screws are commonly used in applications requiring a high degree of fastening security and resistance to loosening under vibration ².

Purpose of the 3904217 Hexagon Head Cap Screw

The 3904217 Hexagon Head Cap Screw is employed in truck operations to secure various components, ensuring structural integrity and maintaining mechanical assemblies. It is used in applications where reliable fastening is required to withstand the dynamic loads and vibrations experienced by commercial trucks. By securing critical components, this screw contributes to the safe and efficient operation of the vehicle ³.

Key Features

The 3904217 Hexagon Head Cap Screw features a robust design with a material composition that enhances its performance and durability. It typically includes a high-strength steel core, which provides the necessary tensile strength to withstand significant loads. The screw has a specific thread type that ensures a secure fit in the mating components, and it may include special coatings or treatments to improve corrosion resistance and reduce friction during installation ¹.

Benefits

The 3904217 Hexagon Head Cap Screw offers several benefits that contribute to the reliability and safety of truck operations. Its design allows for improved fastening security, which is crucial in applications where components are subject to dynamic loads and vibrations. The screw’s resistance to vibration loosening ensures that fastenings remain secure over time, reducing the risk of component failure. Additionally, any corrosion-resistant coatings applied to the screw enhance its durability in various environmental conditions, further contributing to the overall reliability of the truck ².

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws, such as loosening or corrosion, can be addressed through proper troubleshooting and maintenance practices. Regular inspections should be conducted to check for signs of wear, corrosion, or loosening. If corrosion is detected, cleaning the affected area and reapplying a protective coating can help prevent further degradation. To address loosening, re-tightening the screw to the manufacturer’s specified torque settings is recommended. Additionally, ensuring that mating surfaces are clean and free of debris can improve the screw’s performance and longevity ³.

Cummins Engine Compatibility with Hexagon Head Cap Screw Part 3904217

The Cummins Hexagon Head Cap Screw part number 3904217 is a versatile component designed to fit a variety of Cummins engines. This screw is integral to the assembly and maintenance of these engines, ensuring secure fastening in various applications. Below is a detailed look at the compatibility of this part with different Cummins engine models.

ISB Series Engines

• ISB CM2150
• ISB CM550
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B110
• ISB5.9 CM2880 B127
• ISB5.9 CM2880 B140
• ISB5.9 CM2880 B149
• ISB5.9G CM2180

The ISB series engines, ranging from the ISB3.9 to the ISB5.9G, utilize the 3904217 screw in several critical applications. This includes securing components within the engine block, ensuring the integrity of engine mounts, and fastening various engine accessories.

QSB Series Engines

• QSB3.9 CM2880 B138
• QSB5.9 44 CM550
• QSB5.9 CM2880 B115
• QSB5.9 CM2880 B139
• QSB5.9G
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

The QSB series engines, from the QSB3.9 to the QSB7, also benefit from the use of the 3904217 screw. This part is essential for maintaining the structural integrity of the engine by securing various components, including the engine block, valve covers, and other critical parts.

B5.9 Series Engines

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

The B5.9 series engines, including the B5.9 CM2670 B166C, B5.9 G, and B5.9 GAS PLUS CM556, incorporate the 3904217 screw in their design. This screw is used to fasten components within the engine, ensuring that all parts remain securely in place during operation.

4B3.9 and 6B5.9 Engines

• 4B3.9
• 6B5.9

The 4B3.9 and 6B5.9 engines also utilize the 3904217 screw for various applications. This includes securing the engine block, valve covers, and other critical components, ensuring the engine operates smoothly and efficiently.

The 3904217 Hexagon Head Cap Screw is a critical component for the assembly and maintenance of these Cummins engines. Its use across various engine series highlights its versatility and importance in ensuring the reliability and performance of Cummins engines.

Role of Part 3904217 Hexagon Head Cap Screw in Engine Systems

The 3904217 Hexagon Head Cap Screw is integral to the assembly and maintenance of various engine components. It is commonly used in securing and fastening different parts within the engine system, ensuring stability and proper function.

In the cylinder block and cylinder head, this screw plays a significant role in maintaining the structural integrity by securing components such as gaskets, sensors, and other critical elements. It is also utilized in the crankshaft and bearings assembly to ensure that the crankshaft is properly aligned and secured within the engine block.

For the engine block and short block configurations, including the short 4bt, short 4bta, short 6bt, and short e2 incent blocks, the Hexagon Head Cap Screw is essential for fastening various brackets, mounts, and ancillary components. It ensures that these parts remain firmly in place under the high stresses and vibrations experienced during engine operation.

In the service block and spare parts kit, this screw is often included to facilitate the repair and replacement of worn or damaged components. Its use extends to the long block assembly, where it helps in securing the cylinder head to the engine block, ensuring a proper seal and alignment.

Additionally, in the block 6-b short, block service, and block short configurations, the Hexagon Head Cap Screw is employed to fasten the block to the engine frame, providing necessary support and stability. It is also used in the short e1 180 block and short e2 block to secure various sensors and emission control components, ensuring they function correctly within the engine system.

Overall, the 3904217 Hexagon Head Cap Screw is a versatile fastener that contributes to the reliable operation and maintenance of numerous engine components.

Conclusion

The 3904217 Hexagon Head Cap Screw by Cummins is a vital component in commercial truck applications, ensuring secure fastening and structural integrity in various engine components. Its robust design, high-strength material, and resistance to corrosion and vibration make it an essential part for maintaining the reliability and safety of truck operations. Proper maintenance and troubleshooting practices are crucial to address common issues and ensure the longevity of this Cummins part.

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