4387622
Diesel Exhaust Fluid Tank
Cummins®

The Diesel Exhaust Fluid Tank, specifically Part #4387622 by Cummins, is a component designed to store Diesel Exhaust Fluid (DEF). This part is integral to modern diesel engines, particularly in the context of emissions control. It facilitates the operation of the Selective Catalytic Reduction (SCR) system, which is employed to reduce nitrogen oxides (NOx) emissions, thereby contributing to environmental protection and compliance with emissions regulations.

Diesel Exhaust Fluid Tank Basics

To understand the Diesel Exhaust Fluid Tank, it is important to first grasp the concept of Diesel Exhaust Fluid (DEF). DEF is a solution of urea and deionized water that is injected into the exhaust stream of diesel engines. The tank stores this fluid, which is then used in the SCR system. The SCR system works by converting NOx into nitrogen and water vapor through a chemical reaction that is initiated by the introduction of DEF into the exhaust stream ¹.

Purpose of the Diesel Exhaust Fluid Tank

This Cummins part plays a role in the SCR system by storing DEF, which is necessary for the reduction of NOx emissions. When the engine operates, DEF is injected into the exhaust stream where it decomposes into ammonia. This ammonia reacts with NOx in the presence of a catalyst, converting them into nitrogen and water vapor. The tank ensures a consistent supply of DEF for this process, which is vital for the effective operation of the SCR system and for meeting emissions standards.

Key Features

4387622 is constructed from materials that are resistant to corrosion and the chemical properties of DEF, ensuring longevity and reliability. It is designed with a specific capacity to hold an adequate amount of DEF for extended periods between refills. Additionally, the tank incorporates design elements that enhance its performance, such as precise DEF delivery mechanisms and robust construction to withstand the operational environment of a diesel engine.

Benefits of Using a Cummins Diesel Exhaust Fluid Tank

Utilizing this Cummins part offers several advantages. It contributes to improved emissions compliance by ensuring the SCR system has a reliable source of DEF. This, in turn, can lead to enhanced engine performance, as the SCR system operates more efficiently. The tank’s durable construction and design also provide reliability, reducing the likelihood of DEF-related issues and contributing to the overall dependability of the emissions control system.

Installation and Integration

Proper installation of this part within a truck’s emissions control system is important for its effective operation. Installation guidelines should be followed to ensure the tank is securely mounted, correctly connected to the DEF delivery system, and properly integrated with the SCR system. Considerations such as the tank’s location, protection from physical damage, and accessibility for refilling should be taken into account during installation.

Maintenance and Troubleshooting

Routine maintenance of this Cummins part involves checking for DEF quality, ensuring there are no leaks, and verifying that the tank is securely mounted and correctly connected. Troubleshooting common issues may involve addressing DEF quality concerns, such as contamination, and repairing or replacing damaged components to maintain the integrity of the SCR system.

Environmental Impact

The use of a Diesel Exhaust Fluid Tank in diesel engines contributes to reducing harmful emissions, particularly NOx, which are known to contribute to smog and acid rain. By facilitating the SCR system’s operation, the tank plays a role in promoting cleaner air quality and mitigating the environmental impact of diesel engine emissions.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes diesel and natural gas engines, as well as related technologies. With a history of innovation in the diesel engine and emissions control technology sector, Cummins is committed to providing solutions that meet the demands of a changing world, including advancements in emissions reduction and fuel efficiency.

Compatibility with Cummins Engines

4387622 is compatible with several Cummins engine models, including:

• F3.8 CM2350
• F128C
• QSB6.7 CM2350 B105
• QSL9 CM2350 L102
• QSX15 CM2350 X105

These engines are part of Cummins’ extensive lineup, each designed for specific applications ranging from industrial to heavy-duty transportation. The DEF tank is engineered to integrate seamlessly with the SCR system in these engines, ensuring optimal performance and reliability.

Role of Diesel Exhaust Fluid Tank in Engine Systems

The Diesel Exhaust Fluid (DEF) tank, specifically part 4387622, is integral to the operation of modern diesel engines equipped with Selective Catalytic Reduction (SCR) systems. This tank stores DEF, a urea-based solution, which is injected into the exhaust stream to convert harmful nitrogen oxides (NOx) into nitrogen and water vapor, significantly reducing emissions.

Integration with Engine Components

1. DEF Pump and Injector: The DEF tank is connected to the DEF pump, which draws the fluid from the tank and pressurizes it. The pressurized DEF is then injected into the exhaust stream via the injector, typically located upstream of the SCR catalyst.

2. SCR Catalyst: The DEF is sprayed into the exhaust stream just before it reaches the SCR catalyst. Here, the urea in the DEF decomposes into ammonia, which reacts with NOx in the presence of the catalyst, facilitating the chemical reaction that neutralizes the pollutants.

3. Exhaust System: The DEF tank is an essential part of the overall exhaust system. Its proper function ensures that the exhaust gases are treated effectively before they are released into the atmosphere, maintaining compliance with emissions regulations.

4. DEF Level Sensor: Many DEF tanks are equipped with a level sensor that monitors the fluid level. This sensor sends signals to the engine control unit (ECU), which manages the DEF injection process and alerts the operator when the tank needs to be refilled.

5. ECU (Engine Control Unit): The ECU plays a significant role in managing the DEF system. It receives data from the DEF level sensor and other sensors within the exhaust system to optimize the injection timing and quantity of DEF, ensuring efficient operation of the SCR system.

6. Aftertreatment System: The DEF tank is a key component of the aftertreatment system, which includes the DEF dosing system, SCR catalyst, and often a Diesel Particulate Filter (DPF). The coordinated function of these components ensures that the engine meets stringent emissions standards.

Conclusion

In summary, the Diesel Exhaust Fluid Tank (Part #4387622) by Cummins is a vital component that works in concert with the DEF pump, injector, SCR catalyst, exhaust system, DEF level sensor, and ECU to ensure the effective reduction of emissions in diesel engines. Its role in the SCR system is crucial for maintaining environmental compliance and promoting cleaner air quality.