Flywheel Ring Mercedes W204 W212 OM642 Diesel Automatic Gearbox A6420300512

Flywheel Ring Mercedes W204 W212 OM642 Diesel Automatic Gearbox is a component from the Flywheels and gears category, designed for OM642 diesel units with an automatic transmission. This solution is engineered to ensure stable operation of the drivetrain, smooth gear shifting, and a reduction in vibrations transmitted from the engine to the gearbox.

Specifications and technical data

• SKU: A6420300512
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420300512
• Substitutable numbers: A6420300512, A 642 030 05 12
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Flywheels & Flexplates

Purpose and technical specifications

The offered flywheel is dedicated to Diesel engines paired with an automatic transmission in Mercedes W204 and W212 class models with the OM642 unit. The design of the flywheel has been engineered to provide proper rotational energy storage, idle stabilization, and optimal operating conditions for the automatic transmission.

The component belongs to the Flywheels and gears category, meaning it is responsible for both torque transmission and interaction with the starter motor and the drivetrain system. As a result, it has a direct impact on engine refinement, driving comfort, and the durability of other drivetrain components.

Benefits of use in the drivetrain

Using the correct flywheel in an OM642 engine with an automatic transmission translates into a number of practical benefits:

• more uniform torque transmission to the automatic transmission,
• reduction of noticeable vibrations and jerks during acceleration and gear changes,
• more stable operation of the diesel unit across the entire rev range,
• limitation of shock loads acting on gearbox components.

For the user, this means higher driving comfort, better drivetrain response, and more predictable vehicle behavior in daily use.

Condition, origin, and fitment

The presented Mercedes brand component comes from the used parts segment, which allows for economical repair or replacement while maintaining characteristics close to factory standards. The flywheel is designed to work with a diesel engine and an automatic transmission, making it a logical choice for drivetrain maintenance in W204 and W212 vehicles with the OM642 unit.

Selecting the right flywheel is crucial for proper interaction with the starter, torque converter, and the electronics controlling the automatic transmission. Proper matching of the component to the specific engine-gearbox configuration minimizes the risk of improper drivetrain operation and accelerated wear of other sub-assemblies.

Application in tuning and upgrades

The flywheel in a diesel engine with an automatic transmission is important not only for maintenance but also for drivetrain modifications. In the case of increasing the power or torque of the OM642 unit, a properly selected flywheel helps maintain drivetrain stability and limit gearbox overload.

If you are interested in a broader context of using used parts for car modifications, it is worth reading the article on our blog: The best used parts for tuning your car. You will find practical tips there on how to consciously select components for more advanced projects.

Service expansion within the drivetrain

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Mercedes and need other elements from the same group, such as additional flywheels, cooperating gears, or related drivetrain components, check out the available parts in the Mercedes flywheels and gears category.