The Mercedes W447 W906 OM651 AdBlue Injection Valve is a specialized component of the exhaust gas aftertreatment system for diesel engines, designed for Mercedes vehicles with the OM651 unit. The valve's precise design ensures controlled dosing of the AdBlue solution into the exhaust stream, supporting stable SCR system operation and reducing nitrogen oxide emissions.
Specifications and technical data
- SKU: A0004900300
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A0004900300
- Substitutable numbers: A0004900300, A 000 490 03 00
- Fuel type: Diesel
- Category: Fuel Injectors
Purpose and Function in the AdBlue System
The AdBlue injection valve is responsible for accurately delivering the agent to the exhaust system in a diesel engine. In conjunction with the SCR catalyst, it enables effective emission reduction, which is important for both the durability of the powertrain and compliance with environmental standards.
This component works with the vehicle's control electronics, responding to the engine's current load, exhaust gas temperature, and fuel injection rate. This ensures a stable AdBlue dosing system and predictable engine operation across the entire RPM range.
Construction and Technical Characteristics
The presented valve belongs to the category of Injector Nozzles, meaning its construction is optimized for precise atomization of the working medium into the exhaust stream. The appropriate nozzle shape and selected flow cross-sections promote uniform mixing of the AdBlue solution, reducing the risk of crystallization and localized thermal stress in the exhaust system.
The solution developed for diesel engines ensures:
- stable dosing of the reducing agent across a wide range of engine loads,
- repeatable spray pattern and proper atomization in the exhaust duct,
- maintenance of operating parameters in accordance with the vehicle manufacturer's specifications.
Integration with the OM651 Diesel Engine
The OM651 diesel engines used in Mercedes W447 and W906 models require a properly selected AdBlue injection valve for the exhaust gas aftertreatment system to operate predictably. Using the correct injector nozzle helps maintain:
- proper cooperation with the engine control unit software,
- emission parameter consistency with factory specifications,
- stable SCR system operation in urban and rural conditions.
Selecting a valve dedicated to a specific diesel engine family reduces the risk of control unit errors, limp mode, and power loss due to incorrect AdBlue dosing.
Condition, Application, and Benefits of Installation
The offered component is a used part, allowing for economical repair of the AdBlue system while maintaining proper functionality. Replacing a faulty valve with a functional one restores correct operation of the emission reduction system without the need for intervention in the control unit software.
The main benefits of using a properly selected AdBlue injection valve in a diesel engine include:
- maintaining SCR system efficiency and reducing the risk of exhaust component clogging,
- decreasing the likelihood of errors related to agent dosing,
- stable powertrain operation in terms of power and torque.
Related Mercedes Injector Nozzles and Technical Knowledge
If you are looking for other components from the Mercedes Injector Nozzles category for similar applications, check out the Mercedes Injector Nozzles available in our store to select components tailored to a specific model and engine version.
When diagnosing fuel system problems in diesel engines, it is useful to know the typical symptoms of wear in dosing components. Detailed information on symptoms, consequences of neglect, and diagnostic methods can be found in the article: Diesel Injector Failures – How to Recognize Them and What Their Neglect Entails. This will allow for a better assessment of the entire system's condition and planning of the appropriate scope of repairs.
