3901448
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3901448, is a component manufactured by Cummins, a well-regarded name in the automotive industry. This screw is significant in heavy-duty truck applications due to its robust design and reliable performance. Cummins is known for its commitment to quality and innovation, making this part a trusted choice for securing various components in heavy-duty trucks ¹.

Basic Concepts

Hexagon Flange Head Cap Screws are designed with a hexagonal head and a flange feature that provides additional surface area for distribution of clamping force. This design allows for efficient tightening using standard tools and helps prevent the screw from sinking into the fastened material. In the automotive industry, these screws are commonly used to secure components that require a high degree of stability and resistance to vibration ².

Purpose and Role in Truck Operation

The 3901448 Hexagon Flange Head Cap Screw plays a specific role in heavy-duty trucks by securing critical components and ensuring structural integrity. It is often used in applications where components are subjected to significant stress and vibration, such as in the engine compartment or chassis. By providing a secure fastening solution, this screw helps maintain the alignment and functionality of various truck parts ³.

Key Features

The 3901448 Hexagon Flange Head Cap Screw features a hexagonal head that allows for easy and precise tightening with standard tools. The flange at the base of the screw head distributes the clamping force over a larger area, reducing the risk of damage to the fastened material. Additionally, the screw is typically made from high-strength materials, such as alloy steel, which enhances its durability and resistance to corrosion. These attributes contribute to the screw’s performance and longevity in demanding truck applications.

Benefits

The 3901448 Hexagon Flange Head Cap Screw offers several benefits, including enhanced fastening strength and resistance to loosening. The flange design helps distribute the clamping force more evenly, reducing the likelihood of the screw working loose over time. Additionally, the screw’s compatibility with various truck components makes it a versatile choice for different fastening applications. Its robust construction ensures reliable performance even in harsh operating conditions.

Installation Guidelines

Proper installation of the 3901448 Hexagon Flange Head Cap Screw is crucial for optimal performance. Begin by ensuring the mating surfaces are clean and free of debris. Use a torque wrench to tighten the screw to the manufacturer’s specified torque settings to avoid over-tightening, which can lead to damage, or under-tightening, which can compromise the fastening integrity. It is also advisable to apply a thread locker to the screw threads to further prevent loosening due to vibration.

Troubleshooting and Maintenance

Common issues with the 3901448 Hexagon Flange Head Cap Screw may include loosening or corrosion. Regular inspection of the screws can help identify any signs of wear or damage. If corrosion is detected, cleaning the affected area and reapplying a corrosion-resistant coating can help prolong the screw’s service life. In cases where screws have loosened, re-tightening to the proper torque specification and applying a thread locker can resolve the issue.

Cummins Overview

Cummins is a renowned manufacturer in the automotive industry, with a history of producing high-quality components for heavy-duty trucks. The company is known for its commitment to innovation and excellence, ensuring that its products meet the rigorous demands of commercial vehicle applications. Cummins’ reputation for reliability and performance makes it a preferred choice among fleet operators and maintenance professionals.

Hexagon Flange Head Cap Screw 3901448 in Cummins Engines

The Hexagon Flange Head Cap Screw part number 3901448, manufactured by Cummins, is a critical component in various Cummins engine models. This screw is designed to secure different parts within the engine assembly, ensuring structural integrity and proper functioning. Below is a detailed description of how this part fits within the specified Cummins engines:

4B3.9, 6B5.9, 6C8.3, B3.3, B3.9 G, B4.5, B5.6 CM2670 B152B, B5.9 G, B5.9 GAS PLUS CM556, B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 G CMOH6.0 B125, B6.7S, G5.9, G5.9 CM558

In these engines, the Hexagon Flange Head Cap Screw 3901448 is utilized to fasten various components, including but not limited to, the cylinder head, intake manifold, and other critical engine parts. Its flange design provides a broad surface area, distributing the load evenly and preventing localized stress on the fastened parts.

ISB CM550, ISB CM850, ISB/ISD4.5 CM2150 B119, ISB/ISD6.7 CM2150 SN, ISB4.5 CM2350 B104, ISB5.9 CM2880 B110, ISB5.9 CM2880 B140, ISB5.9 CM2880 B149, ISB5.9G CM2180, ISB6.7 CM2350 B101

For the ISB series engines, the Hexagon Flange Head Cap Screw 3901448 plays a pivotal role in securing the cylinder head, which is critical for maintaining the engine’s sealing and structural integrity. Additionally, this screw is used in fastening other engine components such as the intake manifold and exhaust system, ensuring that these parts remain securely in place under the high stresses and vibrations typical of engine operation.

The use of the Hexagon Flange Head Cap Screw 3901448 across these engines underscores its versatility and importance in maintaining the engine’s overall performance and reliability.

Role of Part 3901448 Hexagon Flange Head Cap Screw in Engine Systems

The Part 3901448 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.

Alternator Drive and Location

In the alternator drive system, this screw is used to fasten the alternator to its mounting bracket, ensuring a stable connection that can withstand the vibrations and rotational forces generated during operation. At the alternator location, it secures the alternator in place, maintaining proper alignment with the engine’s drive belt.

Turbocharger Arrangement and Location

For turbochargers, the Hexagon Flange Head Cap Screw is employed in the turbocharger arrangement to attach the turbocharger to the engine block or manifold. This secure attachment is vital for maintaining the turbocharger’s position and ensuring efficient airflow through the system. At the turbocharger location, it helps in fastening the turbocharger housing, contributing to the system’s overall stability.

Breather and Crankcase

In the breather system, this screw is used to attach the breather housing to the crankcase. This connection allows for the release of pressure build-up within the crankcase, preventing damage to engine components. The screw ensures a tight seal, which is essential for the proper functioning of the breather system.

Cleaner and Air Connection

For the air cleaner and its connection to the air intake manifold, the Hexagon Flange Head Cap Screw secures the air cleaner housing, ensuring a snug fit that prevents air leaks. This is important for maintaining the correct air-fuel mixture and enhancing engine performance.

Water Inlet and Pump Drive

At the water inlet and water pump drive, this screw is used to fasten the water pump to its housing. This secure attachment ensures that the water pump operates efficiently, providing consistent coolant flow through the engine to prevent overheating.

Cam Follower and Fan Drive

In the cam follower system, the screw secures the cam follower to its mounting bracket, ensuring precise tracking and reduced wear on the camshaft. For the fan drive, it attaches the fan to its housing, ensuring that the fan operates smoothly and effectively cools the engine.

Front Gear Housing and Marine Applications

In front gear housings, particularly in marine applications, the Hexagon Flange Head Cap Screw is used to secure the housing to the engine block. This is essential for withstanding the harsh marine environment and ensuring the longevity of the gear system.

Manifold and Radiator System

In the air intake and exhaust manifolds, this screw fastens the manifold to the engine block, ensuring a leak-free connection that is vital for optimal engine performance. In the radiator system, it secures the radiator to its mounting brackets, ensuring proper alignment and efficient heat dissipation.

Oil Replenishing and Transmission

For the oil replenishing system, the screw is used to attach the oil replenishing unit to the engine, ensuring a secure connection that allows for consistent oil flow. In transmission applications, it secures transmission components, contributing to the smooth operation of the transmission system.

Exhaust Manifold and Gear Marine Housing

In the exhaust manifold, the screw ensures a secure attachment to the engine, preventing exhaust leaks. For gear marine housings, it provides a robust connection that can withstand the demanding conditions of marine environments.

Conclusion

The Hexagon Flange Head Cap Screw part number 3901448 is a vital component in the assembly and operation of Cummins engines. Its robust design and reliable performance make it essential for securing various engine components, ensuring structural integrity and efficient operation. Proper installation and maintenance of this screw are crucial for the longevity and reliability of heavy-duty truck engines.