If necessary during repairing process
One of the important points in the car operation is correctly adjusted valves. If valves are adjusted incorrectly then this can lead to reduction of engine operating efficiency and even reduction of its parts lifetime. For example, when gaps are small valves and their seats will burn. At large gaps when valves noncompletely open, engine power will visibly drop.
Car electrical equipment trouble-shooting
Rectify a trouble only in electrical systems of diesel engines