Yamaha F225F Service Manual page 419

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:
0.04–0.59 mm (0.0016–0.0232 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. Set the gear shift to the R position.
R
a
N
d
Shift rod socket a: 90890-06679
12. While turning the shift rod toward the R
(mm)
0.25
0.26
0.26
0.24
0.2525
Specified torque:
0.25
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
Shimming (regular rotation model)
a
position using the specified torque, turn
the drive shaft slowly clockwise and
counterclockwise and
backlash between where the drive shaft
stops in each direction.
20 N·m (2.0 kgf·m, 14.8 ft·lb)
reverse gear backlash.
0
1
2
3
measure the
4
5
6
7
8
9
10
A
8-40