Mercedes W212 OM272 Flywheel Starter Ring Gear Automatic Gearbox A2720300712

Mercedes W212 OM272 Flywheel Starter Ring Gear Automatic Gearbox is a precision component from the Flywheels and gears category, designed for use with the OM272 engine and automatic transmission. It is responsible for efficient torque transmission and proper engagement with the starter motor, which is crucial for reliable engine starting and stable operation of the drivetrain.

Specifications and technical data

• SKU: A2720300712
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2720300712
• Substitutable numbers: A2720300712, A 272 030 07 12
• Gearbox type: Automatic
• Category: Flywheels & Flexplates

Purpose and function in the drivetrain

The presented flywheel with starter ring gear is designed for use in automatic transmissions in Mercedes W212 class models with the OM272 engine. This component performs several essential functions in the powertrain:

• ensures a stable connection between the crankshaft and the automatic transmission,
• enables proper engagement with the starter motor gear during startup,
• supports the damping of crankshaft rotational irregularities,
• serves as a base for transferring torque to the torque converter.

Thanks to the precisely selected tooth geometry and ring gear design, engine starting remains repeatable and mechanically stable, which translates into reduced stress on the starter motor and the entire starting system.

Benefits of using an original Mercedes component

The flywheel with starter ring gear from the Mercedes range ensures factory-fit compatibility with the OM272 engine and automatic transmission. This means maintaining proper alignment, mounting hole spacing, and tooth profile, which is crucial for:

• correct installation without the need for modifications,
• maintaining proper balance of the rotating assembly,
• minimizing the risk of noise and vibration during drivetrain operation,
• preserving operating parameters in accordance with manufacturer specifications.

Choosing a used, original component from this group allows for a technically correct repair while maintaining a favorable cost-to-quality ratio, especially when servicing vehicles that are used intensively.

Operating characteristics with an automatic transmission

In vehicles with an automatic transmission, the flywheel with starter ring gear works in conjunction with the torque converter. Proper fitment of these elements is essential to:

• ensure smooth torque transfer to the transmission,
• maintain the correct position of the converter relative to the transmission oil pump,
• limit mechanical stress during gear shifts,
• maintain stable drivetrain operation under various loads.

A well-matched flywheel in an automatic system improves the overall refinement of the drivetrain, reducing unwanted vibrations and supporting the durability of the transmission.

Use in service and repairs

This component is particularly useful for:

• overhauling or replacing the OM272 engine in a Mercedes W212,
• repairing the starting system when there are issues with starter engagement,
• servicing an automatic transmission that requires removal of the powertrain,
• diagnosing noises originating from the area of the transmission housing.

Selecting the correct flywheel with starter ring gear allows for restoring proper drivetrain operation without compromising on compatibility and geometry.

System expansion – related parts and technical knowledge

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

When selecting used drivetrain components, it is worth considering the specific operating characteristics of the engine and automatic transmission, as well as the quality of the available parts. Additional tips on making informed choices regarding aftermarket components can be found in the article The best used parts for tuning your car, which discusses a practical approach to selecting used parts for modernization projects.

For users interested in the characteristics of drivetrains used in Mercedes vehicles and the impact of individual components on AWD system performance, the comparative material xDrive, 4Matic, quattro or 4Motion – a comparison of AWD systems from BMW, Mercedes, Audi and VW may also be useful, describing, among other things, the importance of mechanical elements in the durability and refinement of the drivetrain.