Shimano DURA-ACE FC-R9100 Dealer's Manual page 18

INSTALLATION
Installation of the crank
(C)
(z)
(A)
4
(B)
Push in the stopper plate and check that
the plate pin is securely in place, and
then tighten the bolt of the left crank
arm.
Tighten both bolts equally to the
specified tightening torque (12 - 14 N·m).
(z)
The illustration is of the left crank
arm (cross-section)
18
(A)
Plate pin
(B)
Stopper plate
(C)
Left crank arm
Tightening torque
12 - 14 N·m
NOTE
•
The two bolts should be tightened at the
same time rather than each bolt being fully
tightened separately.
•
Set the stopper plate in the correct
direction as shown in illustration.