3904052
Hexagon Head Cap Screw
Cummins®

Introduction

The Cummins 3904052 Hexagon Head Cap Screw is a specialized fastener designed for use in heavy-duty truck components. It is integral to the assembly and maintenance of various truck systems, ensuring components remain securely fastened under demanding operational conditions.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a type of bolt characterized by its hexagonal head, which allows for efficient tightening and loosening using a wrench or socket. These screws are commonly used in mechanical assemblies to secure components together, providing a strong and reliable connection ¹.

Purpose of the 3904052 Hexagon Head Cap Screw in Truck Operations

This Cummins part plays a specific role in the operation and maintenance of heavy-duty trucks. It is utilized in various truck systems, including the engine, transmission, and chassis, to ensure that critical components are held firmly in place. Its design and material properties make it suitable for withstanding the high stresses and vibrations encountered in truck operations ².

Key Features

The 3904052 Hexagon Head Cap Screw boasts several key features that contribute to its functionality and durability. It is composed of high-strength materials, typically alloy steel, which provides excellent tensile strength and resistance to wear. The screw features a coarse thread type, which allows for quick and secure fastening. Its hexagonal head design ensures easy installation and removal using standard tools ³.

Benefits of Using the 3904052 Hexagon Head Cap Screw

The advantages of using this part include enhanced durability, resistance to corrosion, and ease of installation and removal. Its high-strength material composition ensures it can withstand the rigors of heavy-duty truck operations, while its corrosion-resistant properties help prolong its service life. The hexagonal head design allows for efficient tightening and loosening, reducing the risk of damage to the screw or surrounding components.

Installation Guidelines

Proper installation of the 3904052 Hexagon Head Cap Screw is vital to ensure secure fastening. Begin by cleaning the mating surfaces to remove any debris or contaminants. Use a torque wrench to tighten the screw to the specified torque value, which ensures the screw is properly secured without over-tightening. It is also important to follow best practices, such as using a thread lubricant to reduce friction and prevent galling.

Troubleshooting Common Issues

Common problems associated with Hexagon Head Cap Screws include loosening and corrosion. To address loosening, regularly inspect the screws and re-tighten them to the specified torque value as needed. If corrosion is detected, clean the affected area and apply a corrosion-resistant coating to prevent further degradation. In some cases, replacement of the screw may be necessary to maintain secure fastening.

Maintenance Tips

Regular maintenance of the 3904052 Hexagon Head Cap Screw is essential to ensure longevity and reliable performance. Inspect the screws periodically for signs of wear, corrosion, or loosening. Follow a routine maintenance schedule to re-tighten screws and apply protective coatings as needed. Replace screws that show significant wear or damage to maintain the integrity of the truck’s components.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a rich history dating back to 1919, Cummins has established a strong reputation in the automotive and heavy-duty truck industry for its commitment to quality and innovation. The company’s extensive product range includes engines, powertrains, and aftermarket parts, all designed to meet the demanding needs of heavy-duty applications.

Hexagon Head Cap Screw 3904052 in Cummins Engines

The Cummins part number 3904052, a Hexagon Head Cap Screw, is a critical component in various Cummins engine models. This screw is used in the assembly and maintenance of these engines, ensuring secure fastening of parts and components. Below is a detailed look at how this part integrates with specific Cummins engines:

4B3.9 and QSB3.9 30 CM550

The 3904052 screw is utilized in the 4B3.9 and QSB3.9 30 CM550 engines for securing various components, including engine mounts and accessory brackets. Its robust design ensures that these parts remain tightly fastened, contributing to the engine’s overall stability and performance.

6B5.9 and QSB5.9 30 CM550, QSB5.9 44 CM550

In the 6B5.9 and QSB5.9 30 CM550, as well as the QSB5.9 44 CM550 engines, the 3904052 screw plays a vital role in maintaining the structural integrity of the engine. It is often found in areas that require high strength and durability, such as the cylinder head and engine block assemblies.

B4.5, B5.9 G, B5.9 GAS PLUS CM556, ISB CM550

The 3904052 screw is also a key component in the B4.5, B5.9 G, B5.9 GAS PLUS CM556, and ISB CM550 engines. Here, it is used in the fastening of various engine components, ensuring that parts such as the valve cover and intake manifold are securely attached.

K38, K50

For the K38 and K50 engines, the 3904052 screw is essential in maintaining the alignment and stability of the engine’s structural components. It is commonly used in the fastening of engine mounts and other critical assemblies.

QSK38 CM2150 MCRS, QSK38 CM850 MCRS, QSK50 CM2150 K107, QSK50 CM2150 MCRS, QSK50 CM2350 K108

In the QSK38 CM2150 MCRS, QSK38 CM850 MCRS, QSK50 CM2150 K107, QSK50 CM2150 MCRS, and QSK50 CM2350 K108 engines, the 3904052 screw is integral to the engine’s assembly and maintenance. It is used in securing components such as the engine block, cylinder head, and various auxiliary systems, ensuring that all parts remain firmly in place under operational stresses.

Role of Part 3904052 Hexagon Head Cap Screw in Engine Systems

In the intricate assembly of engine systems, the part 3904052 Hexagon Head Cap Screw serves as a fundamental fastening element, ensuring the secure attachment and stability of various components. Its application spans across multiple engine subsystems, contributing to the overall integrity and functionality of the engine.

Adapter and Front Drive

The Hexagon Head Cap Screw is instrumental in securing the adapter to the front drive mechanism. This connection is vital for the transmission of power from the engine to the driven components, such as the alternator or water pump. The screw’s robust design ensures that the adapter remains firmly attached, even under the dynamic stresses of engine operation.

Bracket Support Mounting

In the context of bracket support mounting, the Hexagon Head Cap Screw plays a key role in attaching support brackets to the engine frame. These brackets are essential for mounting various engine components, including the alternator and pressure regulator. The screw’s hexagonal head allows for easy and secure tightening, ensuring that the brackets remain in place and provide the necessary support for the mounted components.

Filter and Lubricating Oil System

Within the filter and lubricating oil system, the Hexagon Head Cap Screw is used to secure the filter housing and oil passages. This is important for maintaining the integrity of the oil filtration process and ensuring a consistent supply of clean oil to the engine’s moving parts. The screw’s design helps in creating a leak-proof seal, which is essential for the efficient operation of the lubricating oil system.

Retrofit Kits (RB and LB)

For retrofit applications, specifically with the RB and LB kits, the Hexagon Head Cap Screw is utilized in the installation process. It secures various components of the retrofit kit to the engine, facilitating the upgrade or modification of the engine system. The screw’s compatibility with different materials and its resistance to corrosion make it an ideal choice for such applications.

Mounting and Valve Pressure Regulator

In mounting applications, particularly for the valve pressure regulator, the Hexagon Head Cap Screw ensures that the regulator is securely attached to the engine. This is crucial for maintaining the correct pressure within the engine’s systems, contributing to efficient engine performance and longevity.

Conclusion

The 3904052 Hexagon Head Cap Screw is a versatile and reliable component in engine systems, playing a significant role in the secure attachment and stable operation of various engine components. Its application across different subsystems underscores its importance in maintaining the overall functionality and efficiency of the engine.