5511565
Diesel Exhaust Fluid Header
Cummins®

Introduction

The Diesel Exhaust Fluid Header 5511565 is a component designed by Cummins for use in commercial trucks. Its purpose is to facilitate the injection of Diesel Exhaust Fluid (DEF) into the exhaust stream as part of the Selective Catalytic Reduction (SCR) system. This system plays a role in reducing emissions by converting nitrogen oxides (NOx) into nitrogen and water ¹.

Basic Concepts of Diesel Exhaust Fluid Headers

A Diesel Exhaust Fluid Header is a part of the SCR system, which is employed in diesel engines to meet stringent emission standards. The header’s function is to deliver DEF into the exhaust stream at a precise location and rate. This process enables the SCR catalyst to convert NOx into harmless nitrogen and water vapor, thereby reducing the environmental impact of diesel emissions ².

Purpose and Function of the 5511565 Diesel Exhaust Fluid Header

The 5511565 Diesel Exhaust Fluid Header is specifically engineered to work within the SCR system of Cummins engines. It plays a role in the emission control process by ensuring that DEF is injected into the exhaust stream upstream of the SCR catalyst. This injection allows for the chemical reaction that transforms NOx into nitrogen and water, contributing to lower emission levels from the vehicle ².

Key Features

The 5511565 Diesel Exhaust Fluid Header is characterized by its robust design and the use of high-quality materials that ensure durability and reliable performance. It is constructed to withstand the high temperatures and pressures of the exhaust system. Additionally, the header may incorporate features such as precise DEF dosing control and integration with the engine’s electronic control unit (ECU) for optimal performance ³.

Benefits

The use of the 5511565 Diesel Exhaust Fluid Header offers several advantages. It contributes to improved emission control, helping commercial trucks comply with environmental regulations. Furthermore, efficient DEF delivery can lead to potential fuel efficiency gains, as the SCR system operates more effectively. The header’s design also aims to provide longevity and reduce the need for frequent maintenance ².

Troubleshooting and Maintenance

To maintain the performance of the 5511565 Diesel Exhaust Fluid Header, it is important to address common issues such as DEF contamination, blockages, or leaks. Diagnostic steps may include checking DEF quality, inspecting the header for physical damage, and ensuring proper connections. Regular maintenance practices, such as cleaning and replacing worn components, can help ensure the header continues to function effectively ³.

Compatibility with Specific Cummins Engines

The 5511565 header is designed to fit seamlessly with several Cummins engine models, ensuring optimal performance and compliance with emission standards. Here are the engines it is compatible with:

• F3.8 CM2350: This engine benefits from the precise delivery of DEF, enhancing its efficiency and reducing emissions.
• F128C, QSB6.7 CM2350 B105: These engines, known for their robust performance, are well-suited for the 5511565 header, which ensures the DEF is correctly injected into the exhaust stream.
• QSF3.8 CM2350 F107: This model also integrates the 5511565 header to maintain optimal SCR system functionality.
• QSG12/X12 CM2350 G110: The larger capacity of this engine is complemented by the 5511565 header, ensuring the DEF is effectively utilized.
• QSL9 CM2350 L102: This engine model relies on the 5511565 header to manage DEF delivery, ensuring it meets stringent emission regulations.
• QSX15 CM2350 X105: The high-performance nature of this engine is supported by the 5511565 header, which ensures the DEF is accurately delivered to the exhaust system.

Role of Part 5511565 Diesel Exhaust Fluid Header in Engine Systems

The Diesel Exhaust Fluid (DEF) Header, identified by part number 5511565, is an integral component in the selective catalytic reduction (SCR) system of diesel engines. This system is designed to reduce nitrogen oxides (NOx) emissions, which are harmful pollutants produced during the combustion process ¹.

Integration with the DEF Tank

The DEF Header connects directly to the DEF tank, which stores the diesel exhaust fluid used in the SCR process. The header facilitates the transfer of DEF from the tank to the dosing system. This ensures a consistent and regulated flow of DEF into the exhaust stream, where it reacts with NOx to convert these pollutants into harmless nitrogen and water vapor ².

Interaction with the Dosing System

Once the DEF is transferred from the tank via the header, it is injected into the exhaust stream by the dosing system. The DEF Header plays a key role in maintaining the integrity of this fluid flow, ensuring that the dosing system receives a steady supply of DEF. This is essential for the effective operation of the SCR system, as precise dosing is required to maximize NOx reduction efficiency ³.

Contribution to Emission Control

By ensuring a reliable supply of DEF to the dosing system, the DEF Header contributes significantly to the overall emission control strategy of the engine. The SCR system relies on the accurate and consistent delivery of DEF to achieve the desired reduction in NOx emissions. The DEF Header, therefore, is a vital link in the chain of components that work together to meet stringent emission standards ².

Support for Engine Performance

In addition to its role in emission control, the DEF Header supports overall engine performance. By enabling the SCR system to function effectively, the header helps maintain optimal engine operation. This includes ensuring that the engine operates within permissible emission limits, which can prevent potential penalties and maintain the engine’s efficiency and longevity ³.

Conclusion

The Diesel Exhaust Fluid Header 5511565 by Cummins is a critical component in the SCR system, designed to ensure the effective reduction of NOx emissions in diesel engines. Its robust design, precise DEF delivery, and compatibility with various Cummins engines make it an essential part of modern emission control strategies. Regular maintenance and proper troubleshooting are key to ensuring its continued performance and compliance with environmental regulations.