Porsche 928 Workshop Manual page 189

928 Engine/Cylinder Head. Valves
15
4. Tighten camshaft drive belt to specifications with
special tool 9131.
6. Check position of marks
5. Turn engine clockwise two turns to align red
indicator and TDC mark.
Note:
7. Now tighten camshaft drive belt again.
Never turn engine anticlockwise, since this could
8. Turn engine clockwise two turns to align red
destroy the camshaft drive belt tensioner.
indicator and TDC mark.
9. Recheck.
Printed in Germany - IV, 1980
Installing Camshaft Drive Belt and Adjusting Timing 15.15