Mercedes W204 W212 W218 Intake Manifold Inlet Left N/S OM642 Diesel A6420906637

Mercedes W204 W212 W218 Intake Manifold Inlet Left N/S OM642 Diesel is an original intake system component designed for Mercedes diesel engines from the OM642 family. The precisely engineered geometry of the intake channels supports uniform cylinder filling on the left side of the unit, which translates into stable engine operation and predictable performance. As a part from the Intake Manifolds group, it is an important component for professional repair or complete restoration of the intake system in premium vehicles.

Specifications and technical data

• SKU: A6420906637-3
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420906637
• Substitutable numbers: A6420906637, A 642 090 66 37
• Location on the vehicle: Left
• Fuel type: Diesel
• Part type: Intake Manifold
• Category: Intake Manifolds

Purpose and function in the OM642 engine

The presented left intake manifold has been designed to work with the OM642 Diesel engine, used in Mercedes W204, W212, and W218 models. It is responsible for supplying the correct amount of air to the left side of the power unit, which is crucial for the proper combustion process in a diesel engine.

Thanks to its factory design, the manifold maintains the proper tightness of the intake system, reduces pressure drops, and supports the correct operation of the air-flow control equipment. This is particularly important in modern diesels, where stable intake parameters affect engine refinement, dynamics, and exhaust emission levels.

Construction and vehicle fitment

The left intake manifold is a component dedicated to a specific V6 engine design, where each side of the unit has a separate manifold. Its placement on the left side of the vehicle ensures proper routing of the intake channels and compatibility with factory engine equipment.

The original design ensures:

• correct positioning relative to the cylinder head and other intake components,
• fitment with factory mounting points,
• the ability to use standard seals and auxiliary equipment.

As a result, installation is predictable, without the need for modifications or adjustments of replacement parts.

Benefits of using an original intake manifold

Choosing a used, original intake manifold for a Mercedes allows you to maintain the structural integrity of the entire intake system. A component designed by the vehicle manufacturer is optimized for airflow, material durability, and compatibility with the engine control electronics.

The main advantages of this solution include:

• factory fitment for the OM642 unit and W204, W212, W218 bodies,
• preservation of standard engine operating parameters,
• reduction of the risk of intake leaks,
• consistency with other elements from the Intake Manifolds group.

This is especially important for repairs where the goal is to restore the vehicle to a stable, factory specification without experimenting with unverified replacements.

Application area and intake system expansion

The left intake manifold operates in the immediate vicinity of the engine, in an area subject to high temperatures and mechanical loads. The proper selection of this component affects the durability of the entire intake system, including seals, hoses, and air-flow control elements.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional manifolds, intake components, or parts working with the air supply system, check the available parts in the Mercedes Intake Manifolds category.

Professional application and technical knowledge

This intake manifold model is a preferred choice for workshops specializing in Mercedes diesel engine service, where installation predictability and compliance with factory technical documentation are essential. It is suitable for both standard repairs and more advanced work related to engine unit restoration.

For users and mechanics who want to better understand the impact of intake components on the performance and characteristics of a diesel unit, a guide material may be helpful – more information can be found in the article Performance exhaust system: used manifolds and sports catalytic converters on the road, where practical aspects of selecting and operating used manifolds in premium brand cars are discussed.