Yamaha F50A - Page 239

62Y3A11
6-40
1
2
3
4
5
6
7
8
I
5. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
6. Add or remove shims if out of specifica-
tion.
M: Measurement
7. Remove the special service tools from
the propeller shaft.
8. Apply a load to the reverse gear by
installing the propeller
0
without the
spacer
A
, the washer
B
backwards,
then the washer
C
as shown.
NOTE:
Tighten the propeller nut
D
while turning the
drive shaft until the drive shaft can no longer
be turned.
9. Slowly turn the drive shaft clockwise and
counterclockwise and measuring the
backlash when the drive shaft stops in
each direction.
10. Add or remove shims if out of specifica-
tion.
M: Measurement
11. Remove the special service tools, and
then install the water pump assembly.
Forward gear backlash:
0.18–0.54 mm (0.007–0.021 in)
Forward gear
backlash
Shim thickness
Less than
0.18 mm (0.007 in)
To be decreased by
(0.36 – M)
×
0.56
More than
0.54 mm (0.021 in)
To be increased by
(M – 0.36)
×
0.56
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
Reverse gear backlash:
0.71–1.07 mm (0.028–0.042 in)
Reverse gear
backlash
Shim thickness
Less than
0.71 mm (0.028 in)
To be decreased by
(0.89 – M)
×
0.56
More than
1.07 mm (0.042 in)
To be increased by
(M – 0.89)
×
0.56
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
Backlash (F50/F50A)