Yamaha F50D Servise Manual page 267

9
7
Magnet base plate 7: 90890-07003
Dial gauge set 8: 90890-01252
Magnet base 9: 90890-06844
Pinion height gauge set 0: 90890-06669
10. Slowly turn the drive shaft clockwise and
counterclockwise, and then measure the
backlash at the position where it stops in
each direction.
TIP:
Do not turn the drive shaft with excessive
force, otherwise the forward gear will rotate,
leading to incorrect measurements.
11. Turn the drive shaft 180° clockwise and
measure the backlash again.
0
6
8
f
TIP:
Measure the backlash at 4 points: c, d,
9
e, and f, turning the drive shaft 180°
clockwise after each measurement. Note
the measurement data in the shimming
check sheet.
9 When turning the drive shaft, hold it with a
little force. A knocking sound may be heard
when the drive shaft is rotated, but this is
the sound of the pinion contacting the
reverse gear and does not affect the back-
lash measurement.
12. Determine the backlash average, and
then truncate it by dropping the numbers
after the 1/100 place without rounding.
Example:
Measurement
point c
Measurement
point d
Measurement
point e
Measurement
point f
Average
Truncated
average (BL1)
Shimming (FT50C)
c
e
0.30 0.29
0.35 0.32
0.31 0.34
0.36 0.35
0.3300 0.3250
0.33 0.32
0
1
2
d
3
4
5
6
7
8
9
(mm)
0.30
10
0.36
0.34
0.33
0.3325
A
0.33
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