Hi London,
we have here in the forum a short description on the topic.
>>>Ventilspiel Einstellen<<<I would like to divide the topic:
1.) the valve clearance must be measured.
This can be done with a little expertise.
2.) Adjust the valve clearance, adjust.
It is recommended that this task be performed only by skilled mechanics.
It must be removed the camshaft to get to the underlying tappets.
LG Fränk