Measuring The Forward And Reverse Gear Backlash Before Disassembly - SELVA MARINE Kingfish 25 Service Manual

LOWR
Measuring the forward and reverse
gear backlash before disassembly
1. Remove the water pump assembly and
outer plate cartridge. See "Removing the
water pump" (8-37).
2. Set the gear shift to the N position.
F
N
R
3. Install the special service tools, See
steps 3–7 in "Measuring the forward and
reverse gear backlash" (8-28).
4. Install the special service tool 1 at the
lowest possible position where the shaft
diameter is 16 mm (0.63 in).
5. Install the handle stopper 2 so that it is
resting on the step a on the drive shaft,
and then tighten the nuts b to the speci-
fied torque.
b
Backlash indicator 1: 90890-06706
Handle stopper 2: EU0-23814-30
Handle stopper nut b (shimming):
2 N·m (0.2 kgf·m, 1.5 ft·lb)
6. Install the special service tools, See
steps 11 and 12 in "Measuring the for-
ward and reverse gear backlash" (8-28).
8-55
Lower unit
2
b
a
1
7. Turn the drive shaft 180° clockwise and
measure the backlash again.
f
e
TIP:
• Measure the backlash at 4 points: c, d,
e, and f, 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.
8. Determine the backlash average, and
then round down the average to the
1/100 place.
Example:
Measuring point c
Measuring point d
Measuring point e
Measuring point f
Average
Round-down average (BL1)
9. Check that the forward gear backlash
average is within specification.
Forward gear backlash:
0.22–0.69 mm (0.0087–0.0272 in)
c
d
(mm)
0.36
0.38
0.40
0.39
0.3825
0.38