BOSCH 1 005 821 903 Drive Bearing, alternator

Description

The “Drive bearing alternator” in your Audi might refer to two different components:

1. Pulley bearing:

• This bearing sits within the pulley attached to the alternator shaft. It allows the pulley to rotate smoothly while minimizing friction and wear.
• Issues with the drive bearing can manifest as:
  • Whining or grinding noises coming from the alternator area, especially at higher engine speeds.
  • Reduced alternator output and potential warning lights on the dashboard.
  • Excessive wear on the alternator belt due to misalignment caused by a faulty bearing.

2. Alternator shaft bearing:

• This bearing supports the rotating shaft inside the alternator itself. It’s crucial for smooth operation and efficient electricity generation.
• Symptoms of a failing alternator shaft bearing can include:
  • Similar noises as the pulley bearing, but not necessarily related to engine speed.
  • Voltage fluctuations or dips, potentially affecting electrical components in your car.
  • Complete alternator failure, leaving your car reliant on the battery until repair.

Important notes:

• To clarify which bearing you’re referring to, it would be helpful to know your specific Audi model and year, as the terminology and component arrangements can vary.
• Diagnosing the exact issue requires an inspection by a qualified mechanic who can pinpoint the source of the noise or performance problem.
• Replacing either bearing typically involves removing the alternator and disassembling it, so professional expertise is recommended for this repair.