Yamaha 50G Service Manual page 119

LOWR
SHIM SELECTION
Forward gear
1. Install a bearing housing puller (special
service tool) in the bearing housing so
that it engages with the center bolt of
the propeller shaft.
NOTE:
Tighten the center bolt while turning the
propeller shaft a few times clockwise.
Center bolt:
5 Nm (0.5 m • kg, 3.6 ft • lb)
Claw:
YB-6207/90890-06503
50, 60, 70 hp:
90890-06502
Universal puller:
YB-6117
Stopper guide plate:
90890-06501
Center bolt:
90890-06504
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, 75, 80, 90 hp:
Forward gear
backlash
Less than
0.08 mm (0.003 in)
0.08 – 0.25 mm
(0.003 – 0.009 in)
More than
0.25 mm (0.009 in)
6-26
Decrease or increase
Thickness of shim to be
decreased (mm) = (0.17 –
measurement) × 0.60
Decrease or increase will
be unnecessary
Thickness of shim to be
increased (mm) = (mea-
surement – 0.17) × 0.60
E