Mercedes W639 W906 OM646 Fuel Rail A6460701895 is an original component of the diesel engine fuel system, designed for use in Mercedes vehicles with the OM646 unit. The fuel rail ensures stable fuel supply to the injectors at the correct pressure, which translates to smooth engine operation and proper combustion characteristics.
Specifications and technical data
- SKU: A6460701895-2
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A6460702095
- Substitutable numbers: A6460702095, A 646 070 20 95
- Category: Fuel Injectors
Application and Role of the Fuel Rail
The fuel rail for Mercedes W639 and W906 operates at the central point of the common rail system, distributing fuel to individual injectors. It is responsible for:
- stabilizing fuel pressure throughout the OM646 engine fuel system,
- uniform supply to all cylinders, which reduces vibrations and uneven engine operation,
- cooperation with sensors and the engine control unit, enabling precise fuel dosing.
Selecting the correct fuel rail is crucial for maintaining proper engine operating parameters, reducing smoke, and ensuring correct fuel consumption.
Technical Characteristics and Compatibility
The presented fuel rail belongs to the category of injector nozzles, which are elements directly related to the precise delivery of fuel in diesel engines. As a part intended for Mercedes, it has been designed with:
- full compatibility with the OM646 injection system used in W639 and W906 models,
- maintaining the factory operating parameters of the common rail system,
- the possibility of using interchangeable numbers, which facilitates the selection of the appropriate component for different equipment versions and model years.
Its original Mercedes origin promotes proper fit with the existing fuel system and minimizes the risk of installation problems.
Condition, Selection, and Benefits of Installation
The fuel rail is offered as a used original part, allowing for a reasonable cost while maintaining a design consistent with the manufacturer's original specifications. This solution is particularly attractive for maintenance repairs when you want to:
- maintain proper operation of the injection system without the need to invest in a new part,
- maintain compatibility with the factory engine control unit and existing injectors,
- reduce the risk of fitting issues, typical of low-quality aftermarket parts.
Before purchasing, it is advisable to compare the fuel rail's parameters with the vehicle's data and part numbers in the technical specification to confirm compatibility with your specific OM646 engine version.
Operation, Diagnostics, and Technical Knowledge
A functional fuel rail directly impacts the engine's running smoothness, ease of starting, and emission levels. In case of common rail system problems – such as starting difficulties, power loss, or excessive smoke – reliable diagnostics of the entire fuel path, including injectors and the fuel rail, are essential.
To better understand the symptoms and consequences of fuel system component failures, it is worth seeking specialized knowledge. You can find a more detailed discussion on the topic in the article Diesel Injector Failures – How to Recognize Them and What Neglecting Them Entails, which describes typical symptoms, possible consequences of neglect, and basic diagnostic principles.
Other Mercedes Injector Nozzles
If you are looking for other Mercedes injector nozzles suitable for different engine models and configurations, check out our dedicated category. You can find the full offer here: Mercedes injector nozzles, where you can compare available variants and select the right part for your vehicle.
