Audi S4 B9 3.0 TFSI Crankshaft Belt Drive Pulley Wheel 06M105251BB

Audi S4 B9 3.0 TFSI Crankshaft Pulley 06M105251BB is an original part from the Pulleys group, designed for operation in the demanding 3.0 TFSI gasoline engine drivetrain. This used OEM part ensures correct geometry, stable power transfer to the auxiliary systems, and compatibility with the factory design of the Audi S4 B9 generation engine unit.

Specifications and technical data

• SKU: 059105251DP
• Mark: Audi
• Condition: Used
• OEM Part Number: 059105251DP
• Substitutable numbers: 059105251DP, 059 105 251 DP, 06M105251BB, 06M 105 251 BB
• Category: Pulleys

Purpose and Function of the Crankshaft Pulley

The crankshaft pulley in the Audi S4 B9 3.0 TFSI is responsible for the mechanical transfer of torque from the crankshaft to the engine's auxiliary systems, such as the charging system and drive components. A correctly selected pulley stabilizes belt operation, reduces torsional vibrations, and supports the smooth operation of the engine unit across its entire RPM range.

The original design, dedicated to a specific Audi model, guarantees proper fit to the crankshaft profile, correct working diameter, and adherence to the factory operating parameters of the drivetrain. This ensures consistency with the factory control maps and the characteristics of the 3.0 TFSI engine.

Benefits of Using an Original Audi Pulley

Using a pulley from the same design family as the factory part allows for predictable operation of the auxiliary drive. For the user, this means:

• maintaining correct axial alignment and belt tracking in the drivetrain,
• reducing the risk of belt slippage due to incorrect profile or diameter,
• compliance with factory dimensional and material tolerances,
• maintaining engine running culture at the level intended by the manufacturer.

For high-performance vehicles like the Audi S4 B9, the correct selection of parts from the Pulleys group directly impacts the durability of auxiliary systems, stable operation at high RPMs, and safety during dynamic driving.

Application in Tuning and Upgrades

When modifying the 3.0 TFSI engine – both in terms of software and mechanical changes – maintaining the original geometry of the crankshaft pulley is crucial for the proper functioning of the entire system. A used OEM part can be an attractive solution for those who:

• are restoring the factory configuration after previous modifications,
• are assembling components for an engine project based on the 3.0 TFSI unit,
• are looking for a compromise between quality and purchase cost.

If you are interested in a broader context of using used components for car modifications, it is worth reading the article Best Used Parts for Your Car Tuning, which discusses a practical approach to selecting such components.

Condition, Verification, and Vehicle Fitment

The presented pulley is offered as a used part, which means it comes from a disassembly and has been verified for its suitability for further use. This type of component allows for economical repair or upgrade of the drivetrain while maintaining the original manufacturer's specifications.

Before purchasing, it is recommended to compare the vehicle's identification data and technical parameters with the information in the specifications to ensure full compatibility with your specific Audi S4 B9 3.0 TFSI version. This minimizes the risk of installation problems and ensures proper cooperation with other system components.

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other parts from the same group, such as additional drive pulleys, tensioners, or idler pulleys, check the available parts in the Audi Pulleys category.