Yamaha F80B Service Manual page 152

LOWR
3. Install the special service tool so that it
pushes against the propeller shaft.
NOTE:
Tighten the center bolt while turning the drive
shaft until the drive shaft can no longer be
turned.
Bearing housing puller claw L 1:
90890-06502
Stopper guide plate 2: 90890-06501
Center bolt 3: 90890-06504
4. Install the backlash indicator onto the
drive shaft (20 mm [0.79 in] in diameter),
then the dial gauge onto the lower unit.
NOTE:
Install the dial gauge so that the plunger a
contacts the mark b on the backlash indica-
tor.
6-29
Lower unit
Backlash indicator 4: 90890-06706
Magnet base plate 5: 90890-07003
Dial gauge set 6: 90890-01252
Magnetic base B 7: 90890-06844
5. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
Forward gear backlash:
0.28–0.63 mm (0.0110–0.0248 in)
6. Add or remove shims if out of specifica-
tion.
Forward gear
backlash
Less than
0.28 mm (0.0110 in)
More than
0.63 mm (0.0248 in)
M: Measurement
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
7. Remove the special service tools and
then install the water pump assembly.
Shim thickness
To be decreased by
(0.46 – M) × 0.56
To be increased by
(M – 0.46) × 0.56
6D93G11