5511559
Diesel Exhaust Fluid Header
Cummins®

The Diesel Exhaust Fluid Header 5511559, manufactured by Cummins, is a component designed to facilitate the operation of commercial trucks by managing the injection of Diesel Exhaust Fluid (DEF) into the exhaust system. Cummins, a well-established name in the diesel engine industry, produces this part to enhance the performance and environmental compliance of diesel engines ¹.

Basic Concepts of Diesel Exhaust Fluid Headers

Diesel Exhaust Fluid (DEF), also known as AUS 32, is a solution used in diesel engines to reduce emissions. It is composed of urea and deionized water. Within the Selective Catalytic Reduction (SCR) system, DEF headers play a vital role. They deliver DEF into the exhaust stream where it decomposes into ammonia and carbon dioxide. The ammonia then reacts with nitrogen oxides (NOx) in the exhaust, converting them into nitrogen (N2) and water (H2O), thereby reducing harmful emissions ².

Purpose and Function of the 5511559 Diesel Exhaust Fluid Header

This Cummins part is integral to the SCR system’s operation. It is responsible for the precise injection of DEF into the exhaust stream. This injection facilitates the chemical reaction that converts NOx into N2 and H2O. The header ensures that DEF is evenly distributed and effectively mixed with the exhaust gases, optimizing the reduction of emissions.

Key Features

The 5511559 is constructed with durability and performance in mind. It is made from high-quality materials that resist corrosion and withstand high temperatures. The design includes robust mounting options to ensure secure installation. Unique design elements, such as optimized flow channels, enhance the distribution of DEF, ensuring efficient emission reduction.

Benefits

This Cummins part offers several advantages. It contributes to improved emission control, helping vehicles meet stringent environmental regulations. Additionally, by reducing emissions, it may lead to increases in engine efficiency and performance. The durable construction of the header ensures long-term reliability and reduced maintenance needs.

Troubleshooting and Maintenance

Common issues with the Diesel Exhaust Fluid Header may include blockages or leaks. Regular inspection and maintenance are recommended to ensure optimal performance. This includes checking for any signs of wear, ensuring secure mounting, and verifying that the DEF injection is functioning correctly. Prompt attention to any issues can prevent more significant problems and ensure the longevity of the component.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions. With a history spanning over a century, Cummins has established itself as an expert in diesel engine technology. The company is committed to innovation and sustainability, continually developing solutions that enhance performance, efficiency, and environmental compliance in the commercial vehicle industry ³.

Compatibility

The Diesel Exhaust Fluid (DEF) Header, part number 5511559, is compatible with the following Cummins engine models:

• F3.8 CM2350
• F128C
• QSB6.7 CM2350 B105
• QSF3.8 CM2350 F107
• QSG12/X12 CM2350 G110
• QSL9 CM2350 L102
• QSX15 CM2350 X105

Role of Part 5511559 Diesel Exhaust Fluid Header in Engine Systems

The Diesel Exhaust Fluid (DEF) Header, identified by part number 5511559, is integral to the efficient operation of modern diesel engines equipped with Selective Catalytic Reduction (SCR) systems. This component facilitates the precise delivery of DEF from the DEF tank to the SCR system, ensuring optimal performance and emissions compliance.

Integration with DEF Tank

The DEF Header connects directly to the DEF tank, acting as a conduit for the fluid. This connection is designed to maintain a consistent flow of DEF, which is essential for the SCR system to function correctly. The header is engineered to withstand the pressures and temperatures associated with DEF, ensuring reliable operation under varying engine loads and conditions.

Function within the SCR System

Once the DEF is transported from the tank via the header, it is injected into the exhaust stream upstream of the SCR catalyst. The DEF, composed primarily of urea and deionized water, reacts with the nitrogen oxides (NOx) in the exhaust, converting them into harmless nitrogen and water vapor. The DEF Header plays a key role in this process by ensuring that the DEF is delivered in the correct quantity and at the right time, directly influencing the efficiency of the NOx reduction process.

Interaction with Other Components

The DEF Header also interfaces with various sensors and control units within the engine system. These include DEF level sensors, temperature sensors, and the engine control unit (ECU). The header’s design allows for seamless integration with these components, facilitating real-time monitoring and control of DEF delivery. This interaction ensures that the SCR system operates within specified parameters, enhancing engine performance and reducing emissions.

Conclusion

In summary, the DEF Header (part 5511559) is a vital component in the DEF delivery system, ensuring that the SCR system receives the necessary fluid to effectively reduce emissions. Its role in connecting the DEF tank to the SCR system, along with its interaction with other engine components, underscores its importance in modern diesel engine technology.