Mercedes ML W164 Fuel Injector Right O/S Pressure Rail OM642 Diesel A6420702695

The Mercedes W164 Fuel Rail Right OM642 Diesel is an original fuel system component designed for Mercedes diesel engines. It ensures stable fuel distribution to the injectors on the right side of the engine unit, which translates to smooth engine operation and correct combustion characteristics.

Specifications and technical data

• SKU: A6420702695
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420702695
• Substitutable numbers: A6420702695, A 642 070 26 95
• Location on the vehicle: Right
• Fuel type: Diesel
• Category: Fuel Injectors

Purpose and Function of the Fuel Rail

The presented right-side fuel rail for the OM642 diesel engine is responsible for distributing high-pressure fuel to individual injectors. A correctly selected fuel rail is crucial for:

• maintaining stable fuel pressure throughout the fuel supply section on the right side of the engine,
• precise diesel fuel metering by the injectors,
• reducing vibrations and pressure pulsations in the common rail system.

This component is dedicated to diesel units, meaning its construction is adapted to the loads typical for diesel engines and their characteristic operating pressure parameters.

Construction and Compatibility with the Injection System

The fuel rail belongs to the category of injector nozzles, working directly with the injectors mounted on the right side of the engine. Its geometry and the arrangement of its ports are designed for the specific layout of the equipment in the engine bay of the Mercedes W164 class, which facilitates installation and maintains the factory routing of fuel lines.

Proper compatibility with the injection system translates to:

• correct positioning of injectors relative to the fuel rail,
• leak-proof fuel connections along the entire length of the component,
• reducing the risk of leaks and pressure drops in the system.

Benefits of Using an Original Fuel Rail

Using an original right-side fuel rail in a Mercedes diesel engine allows for maintaining the operating parameters intended by the vehicle manufacturer. In practice, this means:

• stable engine operation across the full range of loads,
• improved refinement of the diesel unit's operation due to uniform injector supply,
• reducing the risk of injection system errors related to incorrect fuel pressure.

A component from this group is particularly important when diagnosing problems with starting, power loss, or uneven diesel engine operation – replacing a worn fuel rail with a functional component helps restore correct fuel supply parameters.

Application in Diesel Engines and Service Aspects

The fuel rail is designed for diesel fuel supply systems, where high operating pressures are present and precise fuel metering control is required. During injection system service, it is worth paying attention to:

• the tightness of connections between the fuel rail and high-pressure lines,
• the condition of the injector connection seats on the right side of the engine,
• the correct mounting of the fuel rail to the block or cylinder head, without stress or deformation.

Professional installation and checking of the system's operating parameters after replacing the fuel rail are crucial for maintaining the durability of the injectors and other common rail system components.

Technical Support and Educational Materials

When diagnosing problems with the diesel fuel supply system, the article describing typical symptoms and consequences of diesel injector failures will be helpful: Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails. This is a practical source of knowledge for those who want to better understand the relationships between the condition of the fuel rail and the operation of the entire system.

If you are considering a choice between a used original part and an aftermarket replacement, it is worth reading the guide: 5 Reasons Why a Used OEM Part is a Better Choice Than an Aftermarket Replacement. This will allow you to consciously choose a component for your planned repair scope.

Other Mercedes Injector Nozzles

For users looking for other Mercedes injector nozzles, a dedicated category has been prepared where you can find a wide selection of injection system components from this brand: Mercedes injector nozzles. This makes it easy to find the right component for a specific model and engine version.