4903504
Threaded Plug
Cummins®

Introduction

The Cummins 4903504 Threaded Plug is a component designed for use in heavy-duty truck systems. Its primary role is to seal openings within various systems, ensuring that fluids remain contained and system integrity is maintained. This part is integral to the operation of several truck components, contributing to the overall efficiency and reliability of the vehicle.

Purpose and Function

The Cummins 4903504 Threaded Plug serves multiple functions within truck systems. It effectively seals openings, which helps in preventing fluid leaks. By maintaining a secure seal, the plug contributes to the consistent performance of the system it is installed in. This is particularly important in applications where fluid containment is crucial for the operation and longevity of the system ¹.

Design and Construction

The design of the Cummins 4903504 Threaded Plug incorporates several elements that enhance its functionality and durability. It is constructed from high-quality materials that are resistant to corrosion and wear. The plug features a specific thread type that ensures a tight fit within the designated openings. Additionally, it may include special coatings or treatments that further protect against environmental factors and enhance its sealing capabilities ².

Key Features

Several key features distinguish the Cummins 4903504 Threaded Plug. Its corrosion-resistant properties ensure longevity even in harsh operating conditions. The plug is designed for durability, capable of withstanding the pressures and temperatures encountered in heavy-duty applications. Ease of installation is another notable feature, allowing for quick and efficient replacement or installation without the need for specialized tools ³.

Benefits

Utilizing the Cummins 4903504 Threaded Plug offers several advantages. It contributes to improved system reliability by effectively sealing openings and preventing leaks. This can lead to reduced maintenance needs, as the plug helps maintain system integrity over time. Additionally, the plug’s design and materials contribute to enhanced performance of the systems it is installed in, ensuring efficient operation ⁴.

Installation Process

Proper installation of the Cummins 4903504 Threaded Plug is crucial for its effective function. The process involves cleaning the installation site to ensure a proper seal, threading the plug into the opening by hand to avoid cross-threading, and then tightening it to the manufacturer’s specified torque. Using the correct tools and following best practices during installation will help ensure the plug functions as intended ⁵.

Common Applications

The Cummins 4903504 Threaded Plug finds applications in various components of heavy-duty trucks. It is commonly used in engine blocks to seal openings where fluids or gases need to be contained. It is also found in transmission housings and hydraulic systems, where maintaining fluid integrity is critical for system performance and longevity ⁶.

Troubleshooting and Maintenance

Identifying common issues with the Cummins 4903504 Threaded Plug, such as leaks or corrosion, is important for maintaining system performance. Regular inspections can help identify wear or damage early. Recommended maintenance practices include cleaning the plug and its installation site, checking for proper torque, and replacing the plug if signs of wear or corrosion are present. These practices help ensure the longevity and performance of the plug and the systems it serves ⁷.

Compatibility with Cummins Engines

The Cummins Threaded Plug part number 4903504 is designed to fit seamlessly with a variety of Cummins engines, ensuring compatibility and reliability across multiple engine models. Here is an overview of the engines with which this part is compatible:

ISX12 Series

• ISX12 CM2350 X102
• ISX12 G CM2180 EJ
• ISX12/ISX11.9 CM2250

ISZ13 Series

• ISZ13 CM2150 Z105

QSX11.9 Series

• QSX11.9 CM2250 ECF

QSZ13 Series

• QSZ13 CM2150 Z101
• QSZ13 CM2150 Z102

By ensuring compatibility with these engines, the threaded plug 4903504 plays a vital role in maintaining the performance and longevity of Cummins engines across various applications ⁸.

Role of Part 4903504 Threaded Plug in Engine Systems

The 4903504 Threaded Plug is an essential component in various engine systems, ensuring the integrity and efficiency of fuel delivery and system operations.

In the 0EAD system, the threaded plug is utilized to seal specific ports or passages, preventing fuel leakage and maintaining system pressure. This is particularly important in high-pressure environments where even minor leaks can lead to significant performance issues.

Within the Fuel Pump assembly, the 4903504 plug is often employed to cap off unused ports or to provide a secure seal in areas where components are removed for maintenance or upgrade purposes. This ensures that the fuel pump operates within its designed parameters, without unintended fuel escape routes.

For the Fuel Pump Head, the threaded plug plays a role in directing fuel flow and isolating certain pathways. This is vital for maintaining the precise fuel metering required for optimal engine performance.

In Fuel Systems HD XPI, the plug is integrated into the housing to manage fuel pathways and pressures. Its accurate placement ensures that fuel is delivered consistently and efficiently to the engine, enhancing overall system reliability.

The Front Gear and Pump Fuel components also benefit from the threaded plug’s sealing capabilities. By preventing fuel from escaping through non-operational ports, it helps in maintaining the desired fuel pressure and flow rates, which are essential for the smooth operation of these components.

In the XPI JV Components and XPI JV System Cummins HD, the 4903504 plug is used to seal off areas where fuel lines or sensors may be temporarily disconnected. This is particularly useful during diagnostic procedures or when performing maintenance tasks, ensuring that the system remains pressurized and operational.

Similarly, in the XPI JV System Scania HD, the plug is employed to maintain system integrity by sealing off areas not in use, thus ensuring that the high-pressure fuel system operates efficiently and without leaks.

Overall, the 4903504 Threaded Plug is a versatile component that enhances the functionality and reliability of various engine systems by providing essential sealing and isolation capabilities ⁹.

Conclusion

The Cummins 4903504 Threaded Plug is a critical component in maintaining the integrity and efficiency of heavy-duty truck systems. Its design, durability, and ease of installation make it a valuable asset in preventing fluid leaks and ensuring system reliability. Proper installation and maintenance practices are essential to maximize the benefits of this part, contributing to the overall performance and longevity of the vehicle.