Mercedes W204 W212 Diesel Engine Left Right N/O/S Support Mount Set

Mercedes W204 W212 Diesel Engine Left Right N/O/S Support Mount Set is a component from the Engine mounts category, designed for stable mounting of the powertrain in Mercedes vehicles with diesel engines. A properly selected support reduces the transmission of vibrations to the body, improves engine operation smoothness, and enhances driving comfort. This component is dedicated for use on either the right or left side, which facilitates fitting to a specific vehicle configuration.

Specifications and technical data

• SKU: A2122406317-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2122406317
• Substitutable numbers: A2122406317, A 212 240 63 17, A2042400317, A 204 240 03 17, A2042404717, A 204 240 47 17, A2122404117, A 212 240 41 17
• Location on the vehicle: Right, Left
• Fuel type: Diesel
• Category: Engine Mounts

Function and application of the engine mount support

The engine mount support in Mercedes C-Class (W204) and E-Class (W212) is responsible for transferring loads from the powertrain to the body while dampening vibrations and oscillations. In vehicles with a diesel engine, this is of particular importance, as the higher torque and operating characteristics of a diesel unit generate greater dynamic loads. A correctly selected element supports the stability of the powertrain during acceleration, engine braking, and gear shifting.

Placement on the right or left side allows for precise adjustment to the specific body variant and drivetrain, which is important both when replacing a single mount and during comprehensive maintenance of the entire engine suspension.

Benefits of installation in diesel engines

In Mercedes diesel units, the use of a functional engine mount support translates into several noticeable effects:

• Reduction of vibrations on the steering wheel and in the cabin – improvement of driving comfort, especially at low RPM and at idle.
• More stable powertrain behavior – less engine movement during sudden acceleration or load changes.
• Better cooperation with the drivetrain – reduction of unwanted stresses in the gearbox and half-shafts.
• Reduced risk of damage to adjacent components – lines, hoses, and engine accessories.

Thanks to this, replacing a worn support with a functional element is one of the key steps in restoring the proper operating culture of the powertrain in Mercedes diesel vehicles.

Selection and compatibility with Mercedes W204 / W212

The described engine mount support has been designed with the specific geometry of the engine bay in W204 and W212 models in mind, which ensures proper fitment with factory mounting points. The design intended for installation on the right or left side allows for flexible use of the part depending on the configuration of a given unit.

To ensure full compatibility with a specific vehicle version, it is worth verifying the manufacturer's markings and interchangeable numbers in the technical specification. For users who want to deepen their knowledge on verifying compatibility by numbers, the following guide will be useful: how to safely verify part compatibility by OEM numbers when shopping online.

The importance of functional engine mounts in diesel operation

In Mercedes vehicles with diesel units, especially at higher mileages, the engine mounting system has a direct impact on perceived dynamics and comfort. Combined with properly functioning injectors and a turbocharger, stable powertrain mounting helps restore original operating smoothness. For owners of models with the popular OM642 engine, an article describing a comprehensive approach to refreshing the powertrain may be useful: Second life of the Mercedes OM642 engine – how injectors and a turbocharger restore the power of the 3.0 V6 CDI.

Replacing a worn engine mount support is often one of the first steps in eliminating excessive vibrations, knocking during start-off, or unpleasant resonances in the cabin, which is important both in daily use and on long highway trips.

Expanding engine mounting system maintenance

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional mounts, brackets, or other vibration-dampening elements, check the available parts in the Mercedes engine mounts category.