Mercedes W169 W245 OM640 Gearbox Flywheel Starter Ring A2660300012

Mercedes W169 W245 OM640 Gearbox Flywheel Starter Ring is a component from the Flywheels and gears category, designed for powertrain systems with the OM640 diesel engine in A-Class and B-Class models. This used OEM component allows for a technically correct replacement of a worn flywheel while maintaining the factory operating characteristics of the drivetrain.

Specifications and technical data

• SKU: A2660300012
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2660300012
• Substitutable numbers: A2660300012, A 266 030 00 12
• Category: Flywheels & Flexplates

Purpose and function in the powertrain

The flywheel in the OM640 diesel engine is responsible for stabilizing crankshaft rotation, reducing torsional vibrations, and correctly transmitting torque to the gearbox. In diesel units operating with higher torque and characteristic pulsations, a properly selected flywheel is crucial for the smoothness of the drive.

In Mercedes W169 and W245 models, using the correct flywheel results in:

• smoother engine operation across the entire RPM range,
• reduction of vibrations transmitted to the body and the drivetrain,
• more stable clutch operation during starting and gear changes.

Technical specifications and fitment

The presented flywheel belongs to the Flywheels and gears group, meaning it is designed to work with the starter motor and clutch system components. The OEM design ensures proper fitment for the OM640 engine and the manufacturer-specified gearbox in Mercedes A-Class and B-Class vehicles of that generation.

Key functional features include:

• factory-standard working surface geometry for the clutch disc,
• correct balancing for operation with the specific crankshaft,
• maintenance of parameters necessary for proper interaction with the starter ring gear.

As a result, installation is performed in accordance with the service procedures specified for the Mercedes W169 / W245 diesel powertrain.

Condition, origin, and service application

The item comes from the used OEM parts segment, which allows for combining original specifications with cost-effective repairs. This type of solution is particularly attractive for comprehensive service work on older vehicles, where both technical compliance and operational economy are important.

The flywheel is suitable for situations where:

• a complete clutch system replacement is being performed and an assessment or replacement of the flywheel is necessary,
• symptoms of excessive vibration or noise occur around the gearbox area,
• OM640 engine repairs are being carried out in conjunction with gearbox removal.

Benefits of using an original flywheel

Using an original flywheel in a Mercedes W169 / W245 with an OM640 diesel engine allows for maintaining the parameters specified by the vehicle manufacturer. For a workshop, this means a lower risk of fitment issues, and for the user – predictable drivetrain behavior after the repair is completed.

Key advantages include:

• compatibility with the factory powertrain design,
• maintenance of proper clutch and starter motor operating characteristics,
• the ability to use a used part while adhering to OEM standards.

Related components and further knowledge

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

When selecting used drivetrain components, it is worth learning about good practices related to tuning and modifications based on aftermarket parts – the article Best used parts for tuning your car will be helpful, as it discusses how to consciously use second-hand OEM components.

If you are interested in how the quick availability of used original parts affects vehicle downtime in the workshop, check out the guide Availability of car parts off the shelf vs. repair time – how used OEM parts shorten workshop stays?, which describes the practical aspects of organizing repairs using OEM components.