Mercedes W204 M274 Flywheel Automatic Gearbox Starter Ring Gear A2740300012

Mercedes W204 M274 Flywheel Starter Ring Gear A2740300012 is a component from the Flywheels and Gears group, designed for gasoline engines paired with automatic transmissions. This used OEM component ensures proper torque transfer between the engine and gearbox, as well as stable interaction with the starter motor.

Specifications and technical data

• SKU: A2740300012-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2740300012
• Substitutable numbers: A2740300012, A 274 030 00 12
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Flywheels & Flexplates

Purpose and Technical Function

The presented flywheel with starter ring gear is dedicated to Mercedes vehicles with gasoline engines and automatic transmissions. It is responsible for:

• stabilizing crankshaft operation at low and medium RPMs,
• proper engagement with the starter gear during startup,
• efficient torque transfer to the automatic transmission.

Thanks to its appropriately selected mass and geometry, the wheel reduces torsional vibrations, which translates to smoother drivetrain operation and reduced stress on cooperating components.

Benefits of Using an Original Flywheel

Using an original flywheel in a gasoline Mercedes with an automatic transmission allows for maintaining the factory operating parameters of the drivetrain. Key advantages include:

• Precise fit for engine and gearbox – maintaining the correct position of the ring gear relative to the starter and proper mounting geometry.
• Consistency with factory settings of the engine and gearbox control units, which reduces the risk of incorrect starting or jerking during gear changes.
• The possibility of using existing mounting points without the need for modifications.

Replacing a worn flywheel with a functional component from the same design group helps reduce startup noise, improper starter engagement, and excessive vibrations transmitted to the automatic transmission.

Application in Gasoline + Automatic Drivetrain

In vehicles with gasoline engines and automatic transmissions, the flywheel with starter ring gear works with the torque converter and the starting system. A correctly selected component:

• ensures smooth torque transfer to the converter,
• stabilizes idle speed,
• reduces mechanical overloads during frequent starts in city traffic.

The proper condition of the ring gear directly impacts the starter's lifespan and daily driving comfort, especially in vehicles used with start-stop systems or for short distances.

Condition, Verification, and Part Selection

The offered component is categorized as used OEM components, allowing for economical repair while maintaining a design consistent with the manufacturer's original specifications. Before installation, a standard inspection of the working surfaces, the gear ring, and the flatness of the mating surface is recommended for further operation in a demanding drivetrain.

To select the correct flywheel for a specific engine version and automatic transmission, pay attention to compatibility with the engine designation, transmission type, and parameters assigned to the particular body model. If you have any doubts, specialized guides on used parts can be helpful – you'll find practical tips in the article how to professionally select used car parts and avoid bad purchases.

Expanding Modernization and Tuning with Used Parts

The flywheel with starter ring gear can be a component of a broader drivetrain modernization project, especially when combining repairs with subtle tuning of the gasoline engine. In such cases, it's worth considering the compatibility of all components working with the automatic transmission to maintain proper operational smoothness and component durability. You can find inspiration and practical examples of using used parts in modification projects in the guide Best Used Parts for Tuning Your Car.

If you are planning a comprehensive repair or modernization of the drivetrain area in your Mercedes and need other elements from the same group, such as flywheels, starter rings, or gears, check the available parts in the Mercedes Flywheels and Gears category.