3904181
Threaded Plug
Cummins®

The Cummins 3904181 Threaded Plug is a component designed for use in commercial trucks, specifically within the engine system. Its role is to seal openings in the engine block or other components, preventing the escape of fluids and gases. This part is significant in maintaining the integrity of the engine system, ensuring optimal performance and longevity of the truck ¹.

Basic Concepts of Threaded Plugs

Threaded plugs are mechanical components used to seal threaded holes in various systems, including automotive and industrial applications. They function by being screwed into a threaded opening, creating a tight seal that prevents the leakage of fluids or gases. These plugs are commonly used in engine blocks, transmission cases, and other fluid-containing components to maintain system pressure and prevent contamination ².

Purpose of the Cummins 3904181 Threaded Plug

The Cummins 3904181 Threaded Plug serves a specific function within the truck’s engine system. It is designed to seal openings in the engine block where components such as sensors or gauges may be installed or removed. By providing a secure seal, this plug helps maintain the engine’s internal pressure, prevents fluid leaks, and protects the engine from contaminants that could enter through unsealed openings ³.

Key Features

The Cummins 3904181 Threaded Plug is constructed from high-quality materials, ensuring durability and resistance to corrosion. Its thread type is designed to create a tight seal, minimizing the risk of leaks. The plug’s design specifications, including its size and shape, are tailored to fit precisely within the engine block’s threaded openings, enhancing its performance and longevity.

Benefits

Utilizing the Cummins 3904181 Threaded Plug offers several advantages. It contributes to improved system integrity by effectively sealing engine block openings, which helps maintain engine pressure and prevent fluid leaks. This plug also plays a role in enhancing overall engine performance by ensuring that the engine operates within its designed parameters, free from leaks or contamination.

Installation Process

Installing the Cummins 3904181 Threaded Plug requires careful attention to detail to ensure a secure fit. The process involves cleaning the threaded opening in the engine block, applying a thread sealant if necessary, and screwing the plug into place using the appropriate tools. It is important to follow the manufacturer’s guidelines for torque specifications to avoid over-tightening, which could damage the plug or the engine block.

Common Issues and Troubleshooting

Common problems associated with threaded plugs include leaks due to improper installation or corrosion over time. To address these issues, it is important to ensure that the plug is correctly installed and that the threaded opening is clean and free from debris. Regular inspections can help identify signs of wear or damage, allowing for timely replacement or repair.

Maintenance Tips

To prolong the lifespan of the Cummins 3904181 Threaded Plug, regular maintenance practices are recommended. This includes inspecting the plug during routine engine maintenance checks for signs of wear, corrosion, or damage. Cleaning the threaded opening before reinstallation and applying the correct thread sealant can also help maintain a secure seal and prevent leaks.

Cummins 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. The company offers a wide range of products designed to meet the demanding requirements of commercial and industrial applications, including the Cummins 3904181 Threaded Plug.

Threaded Plug 3904181 Compatibility with Cummins Engines

The Threaded Plug 3904181, manufactured by Cummins, is a versatile component designed to fit a variety of Cummins engines. This plug is essential for sealing and securing various points in the engine’s system, ensuring optimal performance and safety. Below is a detailed breakdown of the engines that are compatible with this threaded plug:

Compatible Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B3.3
• B3.9 G
• B4.5
• B4.5 CM2350 B129B
• B4.5 RGT
• B5.9 G
• B5.9 GAS PLUS CM556
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125
• C GAS PLUS CM556
• C8.3 G
• D4.0 CM2620 D103B
• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F3.8 F102
• F4.5 CM2620 F139B
• F4.5 CM2620 F141C
• G5.9
• G5.9 CM558

Grouping of Compatible Engines

The threaded plug 3904181 is designed to fit a broad spectrum of Cummins engines, including both older and newer models. Here is a grouping of the engines based on their series and specifications:

B Series Engines

• B3.3
• B3.9 G
• B4.5
• B4.5 CM2350 B129B
• B4.5 RGT
• B5.9 G
• B5.9 GAS PLUS CM556
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125

C Series Engines

• C GAS PLUS CM556
• C8.3 G

F Series Engines

• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F3.8 F102
• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

G Series Engines

• G5.9
• G5.9 CM558

D Series Engines

• D4.0 CM2620 D103B

Other Series Engines

• 4B3.9
• 6B5.9
• 6C8.3

This compatibility ensures that the threaded plug can be used across a wide range of applications, providing a reliable sealing solution for different engine types and configurations.

Role of Part 3904181 Threaded Plug in Various Engine Components

The part 3904181 Threaded Plug is an essential component in several engine systems, contributing to their efficient operation and reliability. Here’s how it integrates with various components:

Compressor Coolant Plumbing

In the compressor coolant plumbing system, the Threaded Plug 3904181 is used to seal off specific points within the coolant passages. This ensures that the coolant flow is directed correctly, preventing leaks and maintaining the optimal temperature of the compressor.

Flywheel Housing

When installed in the flywheel housing, the Threaded Plug 3904181 helps in sealing any unnecessary openings. This is vital for maintaining the integrity of the housing and ensuring that no contaminants enter the system, which could otherwise lead to increased wear and tear on the flywheel.

Flywheel Housing Mounting

For the flywheel housing mounting, the Threaded Plug 3904181 is often used to secure and seal the mounting points. This not only enhances the structural stability of the housing but also prevents any fluid leaks that might occur around the mounting area.

Flywheel Housing Plumbing

In the context of flywheel housing plumbing, the Threaded Plug 3904181 is employed to cap off plumbing lines that are not in use. This practice is common in modular engine designs where different configurations may require different plumbing setups.

Flywheel

Although the flywheel itself does not typically use the Threaded Plug 3904181 directly, it benefits indirectly from the sealed and secure environment created by the plug in adjacent components like the flywheel housing and plumbing.

Housing

Generic housing components often utilize the Threaded Plug 3904181 to seal various ports and openings. This is particularly important in multi-functional housings where different systems may intersect.

Kit PDC and Kit Repto

In repair and diagnostic kits (Kit PDC and Kit Repto), the Threaded Plug 3904181 is a common inclusion. It is used to temporarily seal off areas during maintenance or diagnostic procedures, ensuring that the engine environment remains controlled and clean.

Oil Manifold

The oil manifold system employs the Threaded Plug 3904181 to manage oil flow by sealing off specific pathways. This allows for precise control over oil distribution within the engine, enhancing lubrication efficiency.

Rocker Lever and Rocker Lever Housing

In the rocker lever and its housing, the Threaded Plug 3904181 is used to seal any extraneous openings, ensuring that the lever operates in a clean and contaminant-free environment. This is essential for the smooth and reliable operation of the valvetrain.

Signal Generating Device

For signal generating devices, the Threaded Plug 3904181 may be used to seal off areas where sensors or other components are not installed. This helps in maintaining the integrity of the signal pathways and ensures accurate data collection.

Conclusion

The Cummins 3904181 Threaded Plug plays a crucial role in the engine systems of commercial trucks by ensuring the integrity of various components and systems. Its design and features contribute to the efficient operation and longevity of the engine, making it a vital component in maintaining the performance and reliability of Cummins engines.