The fan drive coupling is attached to the water pump by means of a left-hand threaded connection. When removing it, do not damage the radiator fins.
1. If necessary, remove the fan shroud.
2. Holding the pulley from turning with tool No. 11 5 050, use a special wrench No. 11 5 040 to release the union nut of the water pump shaft and remove the impeller with the fan drive clutch from the pump.
Nut with left-hand thread.
3. Remove the bolts and separate the impeller from the coupling. When installing, tighten the impeller fastening bolts with a spanner no. 11 5 040.
When tightening the bolts with the key No. 11 5,040, the reading of 30 Nm on the torque wrench corresponds to 40 Nm of the actual tightening force.