2871878
Doser Injector
Cummins®

The Cummins 2871878 Doser Injector is a specialized component designed for use in commercial trucks. Its primary role is to facilitate the injection of Diesel Exhaust Fluid (DEF) into the exhaust stream, which is a key process in reducing nitrogen oxide (NOx) emissions. This injector is integral to the Selective Catalytic Reduction (SCR) system, a common technology used in modern diesel engines to meet stringent emissions regulations ¹.

Basic Concepts of Doser Injectors

A doser injector is a device that precisely injects DEF into the exhaust stream of a diesel engine. This injection process converts NOx into harmless nitrogen and water vapor through a chemical reaction within the SCR catalyst. The doser injector’s function is vital for maintaining compliance with emissions standards and ensuring the engine operates within regulatory limits ². The system relies on the accurate dosing of DEF to optimize the reduction of NOx emissions effectively.

Purpose of the Cummins 2871878 Doser Injector

The Cummins 2871878 Doser Injector plays a specific role in the operation of commercial trucks by injecting DEF into the exhaust stream at precise intervals. This injection is controlled by the engine’s electronic control unit (ECU), which monitors various parameters such as engine load, temperature, and exhaust gas composition. The doser injector’s function in the emissions reduction process is to ensure that the SCR system operates efficiently, thereby reducing the truck’s environmental impact.

Key Features

The Cummins 2871878 Doser Injector is designed with several key features that enhance its performance. These include a robust construction using high-quality materials to withstand the harsh conditions of the exhaust system. The injector incorporates advanced technology for precise DEF delivery, ensuring optimal dosing rates. Additionally, it is engineered to be compatible with Cummins engines, providing seamless integration into the truck’s engine system.

Benefits of Using the Cummins 2871878 Doser Injector

Utilizing the Cummins 2871878 Doser Injector offers several advantages. It contributes to improved emissions control by ensuring efficient DEF dosing, which is crucial for meeting regulatory standards. The injector also supports enhanced engine performance by maintaining the effectiveness of the SCR system. Furthermore, it can contribute to increased fuel efficiency by optimizing the exhaust treatment process, leading to potential cost savings for fleet operators.

Installation and Integration

Proper installation of the Cummins 2871878 Doser Injector involves several steps to ensure it functions correctly within the truck’s engine system. It should be mounted in a location that allows for optimal DEF delivery into the exhaust stream. Integration with the engine’s ECU is necessary to ensure that the doser injector operates in sync with other components of the emissions control system. Any necessary adjustments or configurations should be performed according to the manufacturer’s guidelines to ensure optimal performance.

Troubleshooting Common Issues

Common issues associated with the Cummins 2871878 Doser Injector may include clogging, leaks, or malfunctions in the dosing process. Troubleshooting steps may involve inspecting the injector for physical damage, checking the DEF supply lines for leaks, and ensuring that the injector is receiving the correct signals from the ECU. Solutions may range from cleaning the injector to replacing faulty components, depending on the nature of the issue.

Maintenance Tips

Regular maintenance practices are essential to ensure the longevity and optimal performance of the Cummins 2871878 Doser Injector. This includes periodic cleaning to remove any buildup of DEF residue, inspecting the injector for signs of wear or damage, and following the manufacturer’s recommended replacement schedule. Proper maintenance helps prevent issues and ensures the injector continues to operate efficiently.

Performance Monitoring

Monitoring the performance of the Cummins 2871878 Doser Injector is important for detecting potential issues and ensuring it operates within specified parameters. This can be achieved using diagnostic tools and software that provide real-time data on the injector’s performance. Regular checks can help identify deviations from normal operation, allowing for timely interventions to maintain efficiency and compliance with emissions standards.

Cummins Corporation Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emissions solutions. With a history spanning over a century, Cummins is committed to innovation and sustainability in the automotive industry. The company’s product range includes components and systems designed to enhance the performance and efficiency of commercial vehicles, contributing to a cleaner and more sustainable future.

Doser Injector 2871878 Compatibility with Cummins Engines

The Doser Injector part number 2871878, manufactured by Cummins, is designed to fit a variety of Cummins engines. This part is integral to the engine’s fuel injection system, ensuring precise fuel delivery for optimal performance and efficiency.

B4.5 and B6.7 Series Engines

The Doser Injector 2871878 is compatible with the following engines:

• B4.5 CM2350 B104
• B6.7 CM2350 B101
• B6.7 CM2350 B135B

These engines are part of the B series, known for their robust design and reliability in various applications.

ISB Series Engines

The ISB series engines, which include the following, are also compatible with the Doser Injector 2871878:

• ISB (Chrysler)
• ISB4.5 CM2350 B104
• ISB6.7 CM2250
• ISB6.7 CM2350 B101

The ISB series is recognized for its versatility and is used in a wide range of applications, from heavy-duty trucks to industrial machinery.

ISC and ISF Series Engines

The Doser Injector 2871878 is also suitable for the following engines:

• ISC8.3 CM2250
• ISF2.8 CM2220 F129
• ISF3.8 CM2220 AN

These engines are designed for applications requiring high power output and efficiency.

ISL and ISX Series Engines

Lastly, the Doser Injector 2871878 fits the following engines:

• ISL9 CM2250
• ISX12/ISX11.9 CM2250
• ISX15 CM2250

The ISL and ISX series engines are known for their high performance and are often used in the most demanding applications, such as heavy-duty trucks and industrial equipment.

Role of Part 2871878 Doser Injector in Engine Systems

The Part 2871878 Doser Injector is an integral component within the aftertreatment arrangement of modern engine systems. Its primary function is to precisely inject a measured amount of Diesel Exhaust Fluid (DEF) into the exhaust stream. This injection occurs upstream of the Selective Catalytic Reduction (SCR) catalyst within the aftertreatment system.

When the Doser Injector releases DEF, it mixes with the exhaust gases. This mixture then travels to the SCR catalyst, where the DEF decomposes into ammonia. The ammonia reacts with nitrogen oxides (NOx) in the exhaust, converting them into harmless nitrogen and water vapor. This process significantly reduces the emission of pollutants, ensuring the engine system meets stringent environmental regulations.

The efficiency of the Doser Injector is paramount for the optimal performance of the aftertreatment device. It must deliver DEF with precision to maintain the correct ratio of reactants for the chemical reactions within the catalytic converter and decomposition reactor. Any deviation in the dosing can lead to inefficient NOx reduction or the formation of unwanted byproducts.

In summary, the Part 2871878 Doser Injector plays a significant role in the aftertreatment system by ensuring the accurate delivery of DEF, which is essential for the effective reduction of emissions through the SCR process. Its integration with the fluid doser and the overall aftertreatment arrangement underscores its importance in modern engine systems.

Conclusion

The Cummins 2871878 Doser Injector is a critical component in the emissions control system of commercial trucks. By ensuring the precise injection of DEF into the exhaust stream, this part plays a vital role in reducing NOx emissions and maintaining compliance with environmental regulations. Its robust design, advanced technology, and compatibility with various Cummins engines make it an essential component for fleet operators looking to enhance engine performance and efficiency while meeting stringent emissions standards.