Yamaha F225F, Service Manual

Page: 419 / 576

8-40
Shimming (regular rotation model)
0
1
2
3
4
5
6
7
8
9
10
A
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:
9. Check that the forward gear backlash
average is within specification.
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. Set the gear shift to the R position.
12. While turning the shift rod toward the R
position using the specified torque, turn
the drive shaft slowly clockwise and
counterclockwise and measure the
backlash between where the drive shaft
stops in each direction.
TIP:
• Do not turn the drive shaft using too much
force. Otherwise, the reverse gear will turn,
leading to incorrect measurements.
• When turning the drive shaft, hold it using a
little force. A knocking sound may be heard
when the drive shaft is turned, but this is
the sound of the pinion contacting the for-
ward gear and does not affect the backlash
measurement.
13. Repeat steps 7 and 8 to measure the
reverse gear backlash.
(mm)
Measurement point
a
0.25
Measurement point
b
0.26
Measurement point
c
0.26
Measurement point
d
0.24
Average 0.2525
Round-down average 0.25
Forward gear backlash:
0.04–0.59 mm (0.0016–0.0232 in)
a
b
c
d
Shift rod socket
a
: 90890-06679
Specified torque:
20 N·m (2.0 kgf·m, 14.8 ft·lb)
R
N
a