Yamaha F150B Service Manual page 309

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.
13. Turn the drive shaft 180° clockwise and
measure the backlash again.
e
f
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.
14. Determine the backlash average, and
then truncate it by dropping the numbers
after the 1/100 place without rounding.
Example:
Measurement
Measurement
Measurement
Measurement
Truncated
average (BL1)
15. Check that the forward gear backlash
d
Forward gear backlash:
g
TIP:
Adjust the shim thicknesses if the forward
gear backlash is out of specification.
16. Remove the special service tools from
17. Apply a load to the reverse gear by
18. Tighten the propeller nut q to the
Propeller nut (shimming) q:
19. For measuring reverse gear backlash
Shimming (regular rotation model)
0.60
point d
0.51
point e
0.51
point f
0.55
point g
Average 0.5425 0.5500
0.54
average is within specification.
0.15–0.68 mm (0.0059–0.0268 in)
the propeller shaft.
installing the propeller m, spacer n
(without the spacer o), and washer p.
specified torque.
o
m
10 N·m (1.0 kgf·m, 7.4 ft·lb)
proceed the step 12–step 14 again.
(mm)
0.61 0.57
0
0.53 0.52
1
0.52 0.52
0.54 0.55
2
0.5400
0.55 0.54
3
4
5
6
7
8
9
q
p
n
10
A
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