Yamaha F25A, Service Manual

Page: 268 / 444

6-32
E
LOWR
SHIMMING
2. Adjust:
●
Forward gear backlash
Remove or add shim(s).
Forward gear
backlash
Shim thickness
Less than
0.31 mm (0.021 in)
To be decreased
by (0.51 – M)
×
0.49
More than
0.72 mm (0.028 in)
To be increased by
(M – 0.51)
×
0.49
Available shim thickness:
1.0, 1.1, 1.2, 1.3, and 1.4 mm
Reverse gear
1. Measure:
●
Reverse gear backlash
Out of specification
→
Adjust.
Reverse gear backlash:
0.93 ~ 1.65 mm (0.037 ~ 0.065 in)
Measuring steps:
●
Set the shift shaft in the reverse posi-
tion.
●
Load the reverse gear by installing the
propeller without the collar
1 and
then tighten the propeller nut.
T
R
.
.
Propeller nut:
5 Nm (0.5 m • kg, 3.6 ft • lb)
●
Attach the backlash indicator onto the
drive shaft (16 mm diameter).
Backlash indicator 2 :
YB-06265/90890-06706
●
Attach the dial gauge onto the lower
unit and have the dial gauge plunger
contact the mark on the backlash indi-
cator.