Adjust the bearings when axial or radial play appears in the bearings of screw 2. To ensure the presence of these clearances, you must:
Adjusting the carbon monoxide (CO) content in the exhaust gases of ZMZ-406
Adjustment is carried out on a warm engine (coolant temperature 80-90 °C) with a working ignition system and nominal gaps between the electrodes of the spark plugs
The engine has mod. 406 oil pump is driven from the intermediate shaft, for the engine mod. 402, the pump and ignition distributor are driven from the camshaft