how to tell if my BMW 3 Series E90/E91 (2005-2012) clutch is slipping?

Solution

1. Preparation

• Tools Required: Jack and jack stands, socket set, torque wrench, clutch alignment tool, and a floor mat or blanket for comfort.
• Allow the vehicle to cool if it has been driven recently.

2. Remove Transmission

• Sub-steps:
  1. Disconnect the battery to prevent any electrical issues.
  2. Lift the vehicle using a jack and secure it with jack stands.
  3. Remove the driveshaft (if applicable) by unbolting it from the rear differential and transmission.
  4. Detach any electrical connections and sensor wires from the transmission.
  5. Unbolt the transmission from the engine using the socket set.
  6. Carefully lower the transmission and remove it from the vehicle.

3. Inspect Clutch Components

• Sub-steps:
  1. Remove the clutch pressure plate and disc from the flywheel.
  2. Inspect the clutch disc for signs of wear (measuring thickness) and ensure it is not glazed.
  3. Check the pressure plate for warping or damage.
  4. Inspect the flywheel surface for any scoring or damage.

4. Replace Clutch Components (if necessary)

• Sub-steps:
  1. If the clutch disc or pressure plate shows excessive wear, replace them with new parts.
  2. Clean the flywheel surface and, if necessary, resurface or replace it.
  3. Use a clutch alignment tool to position the new disc correctly.
  4. Reinstall the pressure plate and tighten bolts to the manufacturer's specified torque.

5. Reassemble Transmission

• Sub-steps:
  1. Reattach the transmission to the engine, ensuring proper alignment.
  2. Reconnect all electrical connections and reinstall the driveshaft.
  3. Refill transmission fluid if required.
  4. Reconnect the battery once the assembly is complete.