6-27
E
LOWR
SHIM SELECTION
60, 70 hp:
Reverse gear
1. Install a propeller on the propeller shaft,
with the front facing backward, fit the
nut and tighten.
2. Slowly turn the drive shaft in and out
and read the dial gauge when the drive
shaft stops in each direction.
3. Determine the shim size according to
the chart.
50 hp:
60, 70 hp:
Forward gear
backlash
Decrease or increase
Less than
0.09 mm (0.004 in)
Thickness of shim to be
decreased (mm) = (0.19
– measurement) × 0.53
0.09 – 0.28 mm
(0.004 – 0.011 in)
Decrease or increase
will be unnecessary
More than
0.28 mm (0.011 in)
Thickness of shim to be
increased (mm) = (mea-
surement – 0.19) × 0.53
T
R
.
.
Nut (propeller):
5 Nm (0.5 m • kg, 3.6 ft • lb)
Reverse gear
backlash
Decrease or increase
Less than
0.84 mm (0.033 in)
Thickness of shim to be
increased (mm) = (1.01 –
measurement) × 0.60
0.84 – 1.17 mm
(0.033 – 0.046 in)
Decrease or increase will
be unnecessary
More than
1.17 mm (0.046 in)
Thickness of shim to be
decreased (mm) = (mea-
surement – 1.01) × 0.60
Reverse gear
backlash
Decrease or increase
Less than
0.75 mm (0.033 in)
Thickness of shim to be
increased (mm) = (0.94 –
measurement) × 0.53
0.75 – 1.13 mm
(0.033 – 0.044 in)
Decrease or increase will
be unnecessary
More than
1.13 mm (0.044 in)
Thickness of shim to be
decreased (mm) = (mea-
surement – 0.94) × 0.53
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