Yamaha F225F, Service Manual

Page: 464 / 576

8-85
LOWR
Lower unit
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. Remove the cover
i
.
12. Apply a load to the reverse gear by
installing the propeller
j
, spacer
k
, and
washer
l
(without the spacer
m
).
13. Tighten the propeller nut
n
to the
specified torque.
14. Set the gear shift to the R position.
15. 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.
(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:
0.18–0.76 mm (0.0071–0.0299 in)
a
b
c
d
Propeller nut (shimming)
n
:
25 N·m (2.5 kgf·m, 18.4 ft·lb)
Shift rod socket
a
: 90890-06679
i
j
k
m
l
n
R
N
a