To prevent the crankshaft from turning, install the device "11.6.460" (Fig. 6.93) on the torsional vibration damper and secure with bolts.

Remove the bolt (3, see Fig. 6.10) fastenings of the drive sprocket (2) of the oil pump. Remove the sprocket from the pump shaft and take it out of the links

(Information taken from this resource: «bmwman»)
