Yamaha F40B - Page 178

LOWR
Lower unit
6-27 67C3K11
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.
9. Adjust the current forward gear shim
thickness if the forward gear backlash is
out of specification.
M: Measurement
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.
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.
14. Adjust the current reverse gear shim
thickness if the reverse gear backlash is
out of specification.
M: Measurement
Forward gear backlash:
0.18–0.57 mm (0.0071–0.0224 in)
Forward gear
backlash
Forward gear
shim thickness
Less than
0.18 mm (0.0071 in)
To be decreased by
(0.38 – M) × 0.53
More than
0.57 mm (0.0224 in)
To be increased by
(M – 0.38) × 0.53
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
mm
S67C6084
8
T
R
.
.
Propeller nut:
5 N·m (0.5 kgf·m, 3.7 ft·lb)
Reverse gear backlash:
0.75–1.13 mm (0.0295–0.0445 in)
Reverse gear
backlash
Reverse gear
shim thickness
Less than
0.75 mm (0.0295 in)
To be decreased by
(0.94 – M) × 0.53
More than
1.13 mm (0.0445 in)
To be increased by
(M – 0.94) × 0.53
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
mm
S67C6085