Yamaha F150B, Service Manual

Page: 349 / 458

8-70
Shimming (counter rotation model)
0
1
2
3
4
5
6
7
8
9
10
A
TIP:
• The resistance of the spring increases the
force required to turn the drive shaft. There-
fore, to obtain correct measurements, con-
sider the spring resistance force when
turning the drive shaft.
• Do not turn the drive shaft with excessive
force, otherwise the forward gear will rotate,
leading to incorrect measurements.
12. Turn the drive shaft 180° clockwise and
measure the backlash again.
TIP:
• Measure the backlash at 4 points:
d
,
e
,
f
, and
g
, turning the drive shaft 180°
clockwise after each measurement. Note
the measurement data in the shimming
check sheet.
• 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.
13. Determine the backlash average, and
then truncate it by dropping the numbers
after the 1/100 place without rounding.
Example:
14. Check that the forward gear backlash
average is within specification.
TIP:
Adjust the shim thicknesses if the forward
gear backlash is out of specification.
15. Remove the special service tools from
the propeller shaft.
16. Remove the propeller shaft housing
assembly. See “Removing the propeller
shaft housing assembly” (8-55).
17. Install the washers
m
between the
reverse gear
n
and the propeller shaft
o
.
d
e
f
g
(mm)
Measurement
point
d
0.24 0.23 0.22
Measurement
point
e
0.25 0.25 0.20
Measurement
point
f
0.27 0.21 0.20
Measurement
point
g
0.25 0.25 0.20
Average 0.2525 0.2350 0.2050
Truncated
average (BL2)
0.25 0.23 0.20
Forward gear backlash:
0.15–0.49 mm (0.0059–0.0193 in)
m