There is some discussion about this in my thread
here
I would like to start a comprehensive list of causes of engine vibrations at low RPM. So I'll start with the most common, please chime in with your personal experience.
Rack dampener pin (turbo OM617)
Compression
Injector spray pattern
Pre-chamber problems (loss of ball)
Delivery valve sticking/ improper seating
Improper valve lash
Injection pump malfunction (wear/misadjustment)
Air in fuel system
Broken engine mount
Engine balance
What am I missing in this list.