The Mercedes W642 OM642 Diesel Fuel Rail is a fuel system component designed for diesel engines, engineered by the manufacturer for stable fuel pressure and precise injector operation. This is a solution for users seeking a proven common rail for Mercedes diesel units, maintaining original operating characteristics.
Specifications and technical data
- SKU: A6420702495
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A6420702495
- Substitutable numbers: A6420702495, A 642 070 24 95
- Fuel type: Diesel
- Category: Fuel Injectors
Purpose and Role in the Injection System
The fuel rail in the OM642 Diesel engine is responsible for the even distribution of high-pressure fuel to individual injectors. A correctly selected rail ensures:
- stable fuel pressure across the entire engine load range,
- precise dosing of diesel fuel to the injector nozzles,
- consistent operating parameters with the original engine control unit calibration.
This allows the engine to maintain proper running smoothness, and the injection system is less susceptible to overloads resulting from incorrect pressure distribution.
Construction and Compatibility with Diesel Engines
The rail is designed to work with a Diesel common rail fuel system, where maintaining high fuel pressure and rapid response to load changes are crucial. This component works in conjunction with:
- the high-pressure pump, which supplies fuel to the rail,
- the injector nozzles, which receive fuel from the rail,
- sensors and control valves responsible for monitoring operating parameters.
Selecting a rail dedicated to a specific Mercedes engine family ensures compliance with original design assumptions and reduces the risk of adaptation issues with the control unit.
Benefits of Using an Original Fuel Rail
Choosing a fuel rail from the Injector Nozzles category designed for Mercedes units offers a range of practical operational benefits:
- maintaining original operating parameters of the injection system,
- better compatibility with existing injectors and engine accessories,
- reducing the risk of uneven engine operation caused by fuel pressure problems,
- easier diagnostics in case of potential faults, due to compliance with factory schematics.
This solution is particularly beneficial for servicing diesel engines where maintaining adequate fuel rail pressure is critical.
Component Condition and Service Application
The offered fuel rail is a used part, allowing for optimization of repair costs while maintaining proper fuel system operating parameters. This type of component is often chosen for:
- reconditioning of the injection system in diesel engines,
- resolving fuel pressure issues in the common rail,
- comprehensive repairs of the OM642 unit when restoring the correct operation of the entire fuel supply line is required.
Before installation, standard verification of the fuel system and inspection of other components, such as injectors and the high-pressure pump, are recommended to ensure the consistent operation of the entire system.
Technical Support and Educational Materials
When working with a diesel injection system, it is advisable to be aware of common wear symptoms and diagnostic methods. Detailed information on this topic can be found in the article Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails, which discusses symptoms, consequences, and basic testing procedures.
If you are looking for other components from the Mercedes Injector Nozzles category for your vehicle, check out the Mercedes Injector Nozzles available in our store to select a complete solution for your fuel system.
