3904386
Threaded Plug
Cummins®

Introduction

The Threaded Plug 3904386 is a component manufactured by Cummins, a prominent name in the commercial truck industry. This plug serves a specific function within the mechanical systems of trucks, ensuring the integrity and efficiency of various engine operations. Cummins, known for its robust and reliable parts, provides this threaded plug as part of its extensive range of automotive components.

Basic Concepts of Threaded Plugs

Threaded plugs are mechanical components used to seal openings in various systems, including automotive applications. They consist of a cylindrical body with an external thread that allows them to be screwed into a corresponding threaded hole. In the automotive industry, threaded plugs are employed to prevent fluid leaks, protect against contaminants, and maintain system pressure. Their design ensures a secure fit, contributing to the overall functionality and safety of the vehicle ¹.

Purpose of the 3904386 Threaded Plug

This Cummins part is designed to play a role in the operation of commercial trucks by sealing specific openings within the engine or other systems. Its primary function is to prevent the escape of fluids or gases, thereby maintaining system pressure and integrity. By ensuring a tight seal, this plug contributes to the efficient operation of the truck’s engine, enhancing performance and reliability.

Key Features

The 3904386 Threaded Plug is characterized by several distinctive features that enhance its performance and durability. It is constructed from high-quality materials, ensuring resistance to corrosion and wear. The plug features a specific thread type that allows for a secure fit within the designated openings. Its design specifications are tailored to meet the demanding requirements of commercial truck applications, providing a reliable solution for sealing purposes ².

Benefits

Utilizing the 3904386 Threaded Plug offers several advantages. It contributes to improved system integrity by effectively sealing openings and preventing fluid leaks. This, in turn, helps maintain system pressure and efficiency. Additionally, the plug’s durable construction ensures long-term performance, reducing the need for frequent replacements. Its use enhances overall engine efficiency by ensuring that fluids and gases remain contained within the system ³.

Installation and Usage

Proper installation of the 3904386 Threaded Plug is crucial for optimal performance. It should be screwed into the designated opening using the appropriate tools to ensure a secure fit. Care should be taken to avoid over-tightening, which could damage the plug or the surrounding components. Following the manufacturer’s guidelines for installation will help ensure the plug functions as intended, contributing to the efficient operation of the truck’s engine.

Troubleshooting and Maintenance

Common issues associated with threaded plugs include leaks due to improper installation or wear over time. Diagnosing problems may involve checking for signs of fluid escape or system pressure loss. Regular maintenance, such as inspecting the plug for signs of wear or damage, can help ensure its continued effectiveness. Replacing the plug when necessary will help maintain system integrity and engine efficiency.

Cummins: Manufacturer Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a reputation for quality and reliability in the commercial truck industry. Its product range includes a variety of components designed to enhance the performance and efficiency of commercial vehicles, making it a trusted choice for fleet operators and maintenance professionals.

Compatibility with Cummins Engines

The Cummins Threaded Plug part number 3904386 is designed to fit a variety of Cummins engines, ensuring compatibility across multiple models. This plug is a critical component in maintaining the integrity of engine systems, often used in fuel lines, coolant systems, or other fluid pathways.

Compatible Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B3.9 G
• B5.9 G
• B5.9 GAS PLUS CM556
• C GAS PLUS CM556
• C8.3 G
• G5.9
• G8.3
• ISB5.9G CM2180
• V903

Grouping of Compatible Engines

The engines listed above can be grouped based on their specifications and applications:

• 4B3.9, 6B5.9, 6C8.3, B3.9 G, B5.9 G, B5.9 GAS PLUS CM556, C GAS PLUS CM556, C8.3 G, G5.9, G8.3, ISB5.9G CM2180, V903: These engines share a commonality in their use of the Threaded Plug 3904386, indicating a standardized design approach by Cummins for these models.

This compatibility ensures that the threaded plug can be seamlessly integrated into various engine systems, providing a reliable solution for maintenance and repair needs.

Role of Part 3904386 Threaded Plug in Engine Systems

The 3904386 Threaded Plug is an essential component in various engine systems, contributing to the overall functionality and efficiency of the engine. Its applications span across multiple systems, ensuring optimal performance and reliability.

Air Fuel Control Plumbing

In the air fuel control plumbing system, the Threaded Plug helps maintain the integrity of the fuel delivery system. It ensures that there are no leaks in the plumbing, which is vital for maintaining the correct air-fuel ratio. This, in turn, enhances combustion efficiency and reduces emissions.

Air Intake Connection and Manifold

When installed in the air intake connection or the air intake manifold, the Threaded Plug plays a role in sealing any potential gaps. This ensures that the air entering the engine is measured accurately, contributing to better engine performance and fuel economy.

Cylinder Head and Head.Cylinder

In the cylinder head or head.cylinder assemblies, the Threaded Plug is used to seal off unused ports or passages. This prevents any unwanted air or fluid leaks, ensuring that the cylinder head operates efficiently and maintains proper compression levels.

Engine Oil Cooler and Full Flow Oil Filter

For the engine oil cooler and full flow oil filter systems, the Threaded Plug is instrumental in sealing off sections that are not in use. This helps in maintaining the oil pressure and ensuring that the oil filtration process is effective, prolonging the life of the engine components.

Oil Pan and Performance Parts

In the oil pan and various performance parts, the Threaded Plug is used to seal off areas where additional components may be added in the future. This ensures that the oil pan remains leak-free and that performance parts are securely installed, enhancing the engine’s overall reliability.

Turbocharger Location and Mounting

At the turbocharger location and mounting points, the Threaded Plug ensures that the turbocharger is securely attached and that there are no leaks in the system. This is important for maintaining the turbocharger’s efficiency and the overall performance of the engine.

Short Engine Kit and Ford Dealer Components

In short engine kits and components sourced from Ford dealers, the Threaded Plug is often used to seal off areas where modifications may be made. This ensures that the engine kit remains versatile and that any future upgrades can be implemented without compromising the engine’s integrity.

Plumbing and Air Fuel Cont

In general plumbing and air fuel control systems, the Threaded Plug is used to ensure that all connections are secure and leak-free. This is essential for maintaining the efficiency of the engine and ensuring that all systems operate harmoniously.

Conclusion

The Threaded Plug 3904386 is a versatile component that plays a significant role in various engine systems. Its ability to seal off passages, prevent leaks, and ensure secure connections makes it an indispensable part of modern engine designs. Proper installation, regular maintenance, and understanding its role in different engine systems are crucial for maximizing its benefits and ensuring the efficient operation of commercial trucks.