Yamaha F225F Service Manual page 464

LOWR
b
c
TIP:
• Measure the backlash at 4 points: a, b,
c, and d, turning the drive shaft 180°
clockwise after each measurement.
• Write down the measurement data in the
shimming check sheet.
8. Determine the backlash average, and
then round down the average to the 1/
100 place.
Example:
Measurement point a
Measurement point b
Measurement point c
Measurement point d
Average
Round-down average
9. Check that the forward gear backlash
average is within specification.
Forward gear backlash:
0.18–0.76 mm (0.0071–0.0299 in)
TIP:
Adjust the shim thicknesses if the forward
gear backlash is out of specification.
10. Remove the special service tools from
the propeller shaft.
11. Remove the cover i.
8-85
Lower unit
a
d
(mm)
0.25
0.26
0.26
0.24
0.2525
0.25
12. Apply a load to the reverse gear by
installing the propeller j, spacer k, and
washer l (without the spacer m).
13. Tighten the propeller nut n to the
specified torque.
Propeller nut (shimming) n:
25 N·m (2.5 kgf·m, 18.4 ft·lb)
14. Set the gear shift to the R position.
R
N
a
Shift rod socket a: 90890-06679
15. While turning the shift rod toward the R
position using the specified torque, turn
the drive shaft slowly clockwise and
counterclockwise
backlash between where the drive shaft
stops in each direction.
i
m
j
l
k
and measure
n
the