Yamaha F30A Service Manual page 178

LOWR
8. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash between where the drive shaft stops
in each direction.
NOTE:
• Push the drive shaft downward, and then
turn it.
• Measure the backlash at 4 points to find the
average.
Forward gear backlash:
0.18–0.57 mm (0.0071–0.0224 in)
9. Adjust the current forward gear shim
thickness if the forward gear backlash is
out of specification.
Forward gear
backlash
Less than
0.18 mm (0.0071 in)
More than
0.57 mm (0.0224 in)
M: Measurement
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
mm
10. Remove the special service tools from
the propeller shaft.
11. Install the propeller, spacer, bushing, and
nut, without installing the spacer 8.
12. Tighten the propeller nut to the specified
torque.
6-27
Lower unit
Forward gear
shim thickness
To be decreased by
(0.38 – M) × 0.53
To be increased by
(M – 0.38) × 0.53
8
S67C6084
Propeller nut:
5 N·m (0.5 kgf·m, 3.7 ft·lb)
13. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash between where the drive shaft stops
in each direction.
NOTE:
• Push the drive shaft downward, and then
turn it.
• Measure the backlash at 4 points to find the
average.
Reverse gear backlash:
0.75–1.13 mm (0.0295–0.0445 in)
14. Adjust the current reverse gear shim
thickness if the reverse gear backlash is
out of specification.
Reverse gear
backlash
Less than
0.75 mm (0.0295 in)
More than
1.13 mm (0.0445 in)
M: Measurement
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
mm
S67C6085
Reverse gear
shim thickness
To be decreased by
(0.94 – M) × 0.53
To be increased by
(M – 0.94) × 0.53
67C3K11