Attention! In the TDC position of the end of the compression stroke, the camshaft of the inlet valves of cylinders 1 - 4 has play (pic. 4.94) in the gearing of the actuating unit. This is fine.
During work, do not allow the motor shaft to rotate in the opposite direction (counterclock-wise).
Removing the engine timing chain requires qualified personnel and special equipment and should only be carried out on a CTOA-BMW, as installation and adjustment of the valve timing is required.