Yamaha F15MHX Manuel D'entretien page 328

LOWR
BACKLASH MEASUREMENT (F15A/F9.9C)
Measurement steps:
8 Load the reverse gear by installing
the propeller without the front side
collar and then tighten the prepeller
nut
8 Set the lower unit upside down.
Propeller nut:
5 Nm (0.5 m•kg, 3.6 ft•lb)
8 Attach the backlash indicator onto
the drive shaft (12.8 mm in diameter).
Backlash indicator:
YB-06265/90890-06706
8 Attach the dial gauge onto the lower
unit and have the dial gauge plunger
contact the mark on the backlash
indicator.
Base plate:
YB-07003/90890-07003
Dial gauge set:
YU-03097/90890-01252
Magneto base:
YU-34481/90890-06705
8 Slowly turn the drive shaft clockwise
and counterclockwise and when the
drive shaft stops in each direction,
measure the backlash.
2. Adjust:
9 Reverse gear backlash
Remove or add shim(s).
NOTE:
Adjust the shim(s) to be added or removed
according to specification.
Reverse gear
backlash
Less than
0.95 mm (0.037 in)
More than
1.65 mm (0.064 in)
Available shim thickness:
0.10, 0.18, 0.20, 0.30,
0.40 and 0.50 mm
6-25
E
Shim thickness
To be decreased by
(1.30 -measurement)
2.3
To be increased by
(Measurement - 1.30)
2.3