4389736
Threaded Plug
Cummins®

The 4389736 Threaded Plug by Cummins is a component designed for use in commercial truck maintenance and operation. This part is integral to ensuring the proper functioning of various systems within a truck, particularly in preventing fluid leaks and maintaining system integrity.

Basic Concepts of Threaded Plugs

A threaded plug is a mechanical component used to seal openings in various systems. It consists of a cylindrical body with threads on the outside, allowing it to be screwed into a corresponding threaded hole. In the automotive industry, threaded plugs are commonly employed to seal openings in engines, transmissions, and other fluid systems, thereby preventing leaks and maintaining system pressure ¹.

Purpose of the 4389736 Threaded Plug

This Cummins part serves a specific role in the operation of a truck. It is designed to seal openings within the engine or other systems, ensuring that fluids remain contained and do not leak out. This plug helps maintain the integrity of the system it is installed in, contributing to the overall efficiency and reliability of the truck ².

Key Features

The 4389736 Threaded Plug is constructed from high-quality materials, ensuring durability and resistance to corrosion. It features a precise thread type that allows for a secure fit within the designated opening. Additionally, the plug may include unique design elements that enhance its performance, such as a gasket or O-ring to provide an additional seal.

Benefits

The use of the 4389736 Threaded Plug offers several benefits. It helps improve system integrity by effectively sealing openings and preventing fluid leaks. This contributes to the overall efficiency of the engine or system it is installed in, ensuring optimal performance and reliability. Additionally, the plug’s durable construction and corrosion resistance help extend its service life, reducing the need for frequent replacements ³.

Installation Process

Proper installation of the 4389736 Threaded Plug is crucial to ensure a secure fit and effective sealing. The installation process typically involves cleaning the threaded hole to remove any debris or old sealant, 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 surrounding components.

Troubleshooting Common Issues

Common issues associated with threaded plugs include leaks and corrosion. If a leak is detected, it may be necessary to remove the plug, inspect the threads and sealing surfaces for damage, and reapply sealant if needed before reinstalling. Corrosion can be addressed by cleaning the affected areas and ensuring that the plug is made from materials resistant to the specific corrosive agents present in the system.

Maintenance Tips

Regular maintenance of the 4389736 Threaded Plug is important to ensure its continued effectiveness. This includes periodic inspection for signs of wear, corrosion, or leaks. Cleaning the plug and its surrounding area can help prevent the buildup of debris that may interfere with its sealing capability. If significant wear or damage is observed, it may be necessary to replace the plug to maintain system integrity.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration systems, and related components. With a history spanning over a century, Cummins is renowned for its commitment to quality, innovation, and customer satisfaction. The company’s product range includes solutions for on-highway and off-highway applications, marine, power generation, and more, serving a diverse array of industries worldwide.

Threaded Plug 4389736 Compatibility with Cummins Engines

The Threaded Plug 4389736, manufactured by Cummins, is a versatile component that fits into various engine models. This part is designed to ensure proper sealing and functionality in the engines it is compatible with. Here is a detailed look at its compatibility across different Cummins engine models:

QSB6.7 Series

• QSB6.7 CM2250

QSK19 Series

• QSK19 CM2350 K105
• QSK19 CM2350 K114

QSK50 Series

• QSK50 CM2350 K108

QSL9 Series

• QSL9 CM2250
• QSL9 CM2350 L102

QST30 Series

• QST30 CM2350 T101

QSX11.9 Series

• QSX11.9 CM2250 ECF

QSX15 Series

• QSX15 CM2250
• QSX15 CM2250 ECF

This threaded plug is engineered to meet the specific requirements of each engine model, ensuring a secure fit and optimal performance. Its compatibility across these diverse engine series highlights its versatility and importance in maintaining engine integrity.

Role of Part 4389736 Threaded Plug in Engine Systems

The part 4389736 Threaded Plug is an essential component in various engine systems, particularly within the aftertreatment device and its associated modules. This threaded plug is strategically employed to seal and secure specific points within the aftertreatment system, ensuring the integrity and efficiency of the overall engine performance.

In the aftertreatment device, the 4389736 Threaded Plug is utilized to seal openings that are not in use or to prevent the ingress of contaminants into the system. This helps maintain the device’s effectiveness in reducing emissions by ensuring that all components operate within their designed parameters.

Within the device itself, the threaded plug may be used to cap off ports or passages that are not required for a particular application or during specific operational phases. This selective sealing is vital for optimizing the device’s function and longevity.

In the context of the aftertreatment system, the 4389736 Threaded Plug plays a role in maintaining the pressure and flow dynamics essential for the efficient operation of components such as diesel particulate filters (DPFs) and selective catalytic reduction (SCR) systems. By sealing off unnecessary pathways, it ensures that the exhaust gases follow the intended route through the aftertreatment components, enhancing their ability to reduce harmful emissions.

The outlet module of the aftertreatment system also benefits from the use of the 4389736 Threaded Plug. This module is responsible for directing the treated exhaust gases away from the aftertreatment device and back into the exhaust stream. The threaded plug ensures that the module remains sealed against external elements, preserving the module’s efficiency and protecting it from damage.

Overall, the 4389736 Threaded Plug is a versatile component that contributes to the reliability and performance of engine systems by providing necessary seals and closures within the aftertreatment device and its associated modules.

Conclusion

The 4389736 Threaded Plug by Cummins is a critical component in maintaining the integrity and efficiency of commercial truck engine systems. Its role in sealing openings, preventing fluid leaks, and ensuring system pressure makes it indispensable in various automotive applications. Proper installation, regular maintenance, and understanding its compatibility with different Cummins engine models are essential for maximizing its benefits and ensuring the longevity and performance of the engine systems it supports.