Mercedes W164 W204 W211 OM642 Fuel Rail Left A6420700495 is an original component of the diesel engine fuel supply system, designed for installation on the left side of the engine unit. This product from the injector nozzles category ensures stable fuel rail supply and correct cooperation with injectors in OM642 engines used in popular Mercedes models.
Specifications and technical data
- SKU: A6420700495
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A6420700495
- Substitutable numbers: A6420700495, A 642 070 04 95
- Location on the vehicle: Left
- Category: Fuel Injectors
Purpose and Function in the Injection System
The left-side fuel rail for the OM642 engine is responsible for the uniform distribution of high-pressure fuel to individual injectors. A correctly selected component in this area is crucial for:
- stable diesel engine operation across the full load range,
- maintaining proper fuel pressure in the common rail system,
- precise fuel metering by the injectors, which translates to smooth operation and performance.
Dedicated application in OM642 units, fitted in Mercedes W164, W204, and W211 models among others, allows for maintaining factory fuel supply system parameters.
Construction and Fit for OM642 Engine
The rail is designed as an OEM component tailored to the OM642 engine geometry, considering the specific routing of fuel lines and the placement of injectors on the left side of the unit. The appropriate shaping of the body and the arrangement of connection ports enable:
- trouble-free installation at factory mounting points,
- proper routing of high-pressure lines without stress,
- maintaining system seal under high-pressure operation.
Such a fit minimizes the risk of leaks and improper stress on the lines, which is particularly important in common rail systems.
Benefits of Using an Original Fuel Rail
Using the original left-side fuel rail for the OM642 engine in Mercedes W164, W204, and W211 allows for maintaining the fuel supply system's operating parameters at the level intended by the manufacturer. Key advantages include:
- factory compatibility with injectors and accessories used in the OM642 engine,
- stable fuel pressure across the entire RPM range, promoting smooth engine operation,
- reduced risk of engine control unit errors related to improper injection system function,
- maintenance of correct combustion parameters, which can support lower fuel consumption and proper exhaust gas aftertreatment system operation.
Condition, Verification, and Service Application
This component is from a Mercedes vehicle and is offered as a used original part, allowing for economical repair of the injection system while maintaining compliance with factory specifications. This type of component is particularly useful in situations where:
- there are problems with fuel pressure in the common rail system,
- the rail needs replacement due to mechanical damage or corrosion,
- diagnostics indicate incorrect operation of the left injection system section.
To further reduce the risk of selection errors, it is advisable to seek advice on verification using OEM numbers, as described in the article how to safely buy parts online by OEM numbers and codes.
Injection System Diagnostics and Technical Support
When replacing the left-side fuel rail for the OM642 engine, a full diagnostic of the diesel injection system is recommended, including checking injectors, high-pressure lines, and pump operation. Typical symptoms of system problems include rough idling, power loss, or starting difficulties. A detailed discussion of symptoms and potential consequences of neglect can be found in the article diesel injector faults – symptoms, consequences, and diagnostics.
If you are looking for other items from the Mercedes injector nozzles category for your vehicle, check out the Mercedes injector nozzles available in our store to select components tailored to your specific model and engine version.
