Use a BMW or Mahle.
There is a procedure for turning the motor with an allen key in the end of the spindle until it bottoms, counting the turns.
Then as you remove it and the spindle rotates count the turns also.
Dont move the motor after removal.
]When reinserting the motor you also need to turn the spindle back the same number of turns as the worm drive engages.
Once its in place wind the motor back tomits original position.
Many say if you just pull it out and then reinsert it the motor will sort out its running position itself .
I did mine counting the turns in and out and it subsequently started and ran perfectly. N52 3.0si.