Yamaha F15MHX Manuel D'entretien page 376

LOWR
BACKLASH MEASUREMENT (FT9.9D)
Measurement steps:
8 Load the reverse gear by installing
the propeller 1 collar 2 and then
tighten the propeller 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 3 onto
the drive shaft (12.8 mm in diameter)
as shown.
Backlash indicator:
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:
90890-07003
Dial gauge set:
90890-01252
Magneto base:
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
0.66 mm (0.026 in)
More than
1.56 mm (0.061 in)
Available shim thickness:
0.1, 0.2 and 0.3 mm
6-49
E
Shim thickness
To be decreased by
(1.11 -measurement)
2.55
To be increased by
(Measurement - 1.11)
2.55