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

The Mercedes W204 W212 Engine Mount Bushing diesel is an original part from the engine mounts category, designed for diesel engines. It provides stable support for the powertrain, reduces vibration transfer to the body, and improves engine running smoothness in daily use.

Specifications and technical data

• SKU: A2122406317
• 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

Purpose and Function in the Powertrain

The engine mount bushing in Mercedes C-Class W204 and E-Class W212 models is responsible for the precise positioning of the engine relative to the body. For diesel engines, which generate higher torsional vibrations, a properly selected mount is crucial for driving comfort and protection of other powertrain components.

This component works continuously, compensating for engine movements during acceleration, engine braking, and load changes. A correctly chosen mount reduces:

• excessive vibrations transferred to the passenger cabin,
• undesirable powertrain movements,
• loads on the drive shafts, exhaust, and auxiliary system lines.

Vehicle Placement and Compatibility

The presented engine mount bushing is designed for installation on the right or left side of the vehicle, depending on the specific powertrain configuration. This solution simplifies part selection during servicing and allows for flexible application in various equipment variants.

The product is designed for diesel engines, meaning it is adapted to the operating characteristics of high-pressure units – both in terms of stiffness and vibration damping capabilities. As a result, the mount works with the factory powertrain suspension, maintaining the parameters specified by the manufacturer.

Characteristics of a Used Component

The engine mount bushing is sourced from disassembly, allowing for a favorable cost-to-quality ratio while maintaining the original structural specification. A used component of this type is particularly attractive for maintenance repairs where preserving factory fit and mounting geometry is a priority.

Choosing an original, used engine mount for a Mercedes often helps avoid problems associated with imprecise fit of aftermarket alternatives, such as:

• incorrect engine support height,
• mismatched mounting shapes with the subframe,
• increased vibrations due to different damping characteristics.

If you are considering whether a new or used part would be a better choice for your needs, our guide may be helpful: Car Parts – New or Used.

Benefits of Using the Correct Engine Mount

A functional engine mount bushing in a Mercedes W204 / W212 directly translates to driving comfort and component durability. Proper vibration damping reduces the loads on exhaust system components, fuel lines, vacuum hoses, and the electrical system in the engine bay.

The main advantages of a correctly selected engine mount include:

• stable vehicle behavior during engine load changes,
• reduction of knocks and vibrations felt in the cabin,
• better cooperation with the drivetrain,
• maintenance of the correct mounting geometry for the engine unit.

During periods of high temperatures, it is particularly important for the entire powertrain – including the engine mount – to work in conjunction with the cooling system. You can find more information about the impact of thermal conditions on engine operation in the article Summer Heat vs. Cooling System: Used Radiators and Fans Guarantee Savings.

Mercedes Engine Mounts – Selection and Offer

When replacing an engine mount bushing in a Mercedes, it is always advisable to select components within the same category and brand to maintain consistent damping characteristics. If you are looking for other solutions in the same group, check our offer for Mercedes Engine Mounts, where you will find a wide selection of parts tailored to different models and engine versions.

The Mercedes W204 W212 Engine Mount Bushing diesel is a sensible choice for users expecting factory fit, predictable installation, and driving comfort consistent with the vehicle manufacturer's design intentions.