Mercedes W207 W212 Engine Mount Bearing Support Right O/S OM651 A2122400100

Mercedes W207 W212 Engine Mount Bearing Support Right O/S OM651 is a precision-engineered component of the powertrain support system, designed specifically for use with the OM651 engine on the right side of the vehicle. Thanks to its factory-spec geometry and precisely calibrated stiffness, it provides stable engine support, reducing unwanted vibrations and improving the overall refinement of the drivetrain. This is a practical solution for users looking to restore proper engine mounting in their E-Class and C-Class models based on the W207/W212 platform.

Specifications and technical data

• SKU: A2122400100
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2122400100
• Substitutable numbers: A2122400100, A 212 240 01 00
• Location on the vehicle: Right
• Part type: Engine Mount
• Category: Engine Mounts

Purpose and function in the drivetrain

The described mounting bracket works in conjunction with the right engine mount to create a rigid yet flexible support point for the OM651 unit. It is responsible for:

• transferring loads from the engine to the chassis while maintaining proper vibration isolation,
• maintaining the correct geometry of the powertrain assembly relative to the chassis,
• stabilizing the engine during acceleration, engine braking, and gear changes,
• reducing noise and vibrations transmitted to the cabin.

Selecting the correct bracket for the right side of the vehicle is crucial for maintaining driveshaft alignment, proper joint operation, and the durability of other engine mounting components.

Construction and compatibility with the OM651 engine

The bracket has been designed for the specific architecture of the OM651 engine, taking into account its weight, mounting points, and operating characteristics. This means:

• dedicated attachment points to the engine block and the right-side mount,
• maintaining the correct distance between the engine and the chassis,
• compatibility with factory engine mounts used in this generation of Mercedes vehicles.

Such precise fitment translates into stable powertrain handling and predictable vehicle behavior under various operating conditions.

Benefits of using an original mounting bracket

Using the correct engine mount bracket on the right side in W207/W212 models with the OM651 engine allows you to:

• reduce excessive powertrain rocking during start-up and load changes,
• limit the transmission of vibrations to the chassis and interior components,
• reduce the load on other engine and transmission mounts,
• maintain proper routing of hoses, lines, and accessories around the engine.

This is particularly important in modern diesel units, where precise mounting affects both driving comfort and the durability of auxiliary components.

Condition, verification, and practical application

This component is sourced from the secondary market, allowing for cost-effective repairs while maintaining the factory design. Before installation, a standard inspection of the mounting surfaces, threads, and flatness is recommended to ensure proper tightening to the engine block and the mount. Replacing the bracket is particularly recommended when:

• damage or cracks in the existing mount have been identified,
• excessive vibrations persist despite replacing the engine mounts themselves,
• a collision has occurred in the front of the vehicle and there is a suspicion of mounting deformation.

A properly selected mounting bracket helps restore correct powertrain operation without the need for costly modifications.

Mercedes engine mounts – expansion and selection of components

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 complete engine mounts, check out the available parts in the Mercedes engine mounts category.

More about operating Mercedes OM651 engines

When working on the powertrain mounting, it is worth paying attention to the general condition of the accessories, timing system, and fuel injection system. Practical tips on maintaining engines used in popular C-Class and E-Class models, including related OM651 units, can be found in the article: Reliability under the star – how to take care of engine accessories in popular Mercedes-Benz C-Class and E-Class models?