Mercedes W164 W204 W211 OM642 Fuel Injector A6420700587 is an original injector nozzle designed for OM642 diesel engines in Mercedes W164, W204, and W211 models. This component ensures precise fuel dosing, which translates to stable engine operation and proper diesel performance.
Specifications and technical data
- SKU: A6420700587
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A6420700587
- Substitutable numbers: A6420700587, A 642 070 05 87
- Fuel type: Diesel
- Category: Fuel Injectors
Injector Purpose and Function
The presented fuel injector for OM642 engine is responsible for accurate fuel delivery to the combustion chamber in Mercedes diesel units. A properly functioning injector nozzle contributes to:
- stable idle speed and smooth engine operation under load,
- efficient diesel combustion, promoting optimal fuel consumption,
- reduced smoke emissions and improved exhaust gas composition,
- proper acceleration dynamics across the entire RPM range.
Thanks to its proper fuel atomization characteristics, the nozzle helps maintain the factory performance parameters of the OM642 engine in Mercedes W164, W204, and W211 vehicles.
Construction and Technical Characteristics
This injector belongs to the Injector Nozzles category and is structurally adapted for use in diesel fuel systems. The application of appropriate atomizer geometry and precise control valves enables:
- multi-phase fuel injection (pre-injection, main injection, and potentially post-injection) depending on the engine control unit strategy,
- maintenance of correct injection pressure across the entire load range,
- precise fuel spray formation in the combustion chamber, promoting uniform mixture combustion.
This component is designed for diesel fuel systems, therefore its construction takes into account the specific requirements of diesel engines, such as high pressure resistance and precise operation in varying thermal conditions.
Condition, Selection, and Installation
The offered injector is a used part, allowing for an economical repair of the injection system while maintaining original manufacturer specifications. Before installation, it is recommended to:
- verify compatibility with the OEM number and interchangeable numbers in the vehicle's service documentation,
- check operating parameters on a test bench, if possible in workshop conditions,
- use new seals and properly prepare the injector seat in the cylinder head (cleaning, checking the mating surface).
A correctly selected and installed injector reduces the risk of starting problems, power loss, or uneven engine operation, and helps avoid secondary damage to ancillary components.
Benefits of Using an Original Injector Nozzle
Using an original Mercedes injector nozzle in the OM642 engine allows for the maintenance of the engine's factory performance parameters. Key benefits include:
- maintaining the manufacturer's intended operating characteristics – no need for ECU software adaptation or modification,
- better compatibility with other injection system components, such as the high-pressure pump or common rail,
- stable long-term operation, provided appropriate fuel quality and regular servicing.
For workshops and individual users, this means a lower risk of complaints and predictable vehicle behavior after fuel system repair.
Injection System Diagnostics and Prevention
When experiencing issues with diesel engine operation, it is advisable to perform comprehensive injector diagnostics. Symptoms such as difficult starting, increased smoke, power loss, or rough idling may indicate worn nozzles. Detailed information on typical symptoms and the consequences of neglect can be found in the article “Diesel Injector Failures – How to Recognize Them and What Neglecting Them Entails”, which discusses symptoms, consequences, and basic diagnostic methods.
If you need other Mercedes injector nozzles for diesel engines, check the Mercedes injector nozzles available in our store to select components tailored to the specific model and engine version.
