MTU 12V4000G34F Operating Instructions Manual page 127

Note: Danger of confusion: There might be an addi-
tional OT/A1 mark (1) on the outer perimeter
of the flywheel.
4. The additional OT/A1 mark (1) (if applicable)
on the outer perimeter of the flywheel must
not be used for reference.
Diagram for 8V engines – Two
crankshaft positions
Diagram for 12V engines – Two
crankshaft positions
MS15060/01E 2018-12 | Valve Drive | 127