Yamaha F150A Service Manual page 206

LOWR
5. Set the lower unit upside down.
NOTE:
Install the dial gauge so that the plunger a
contacts the mark b on the backlash indica-
tor.
Backlash indicator 4: 90890-06706
Magnet base plate 5: 90890-07003
Dial gauge set 6: 90890-01252
Magnet base B 7: 90890-06844
6. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
Forward gear backlash:
0.14–0.42 mm (0.0055–0.0165 in)
7. Add or remove shim(s) if out of specifica-
tion.
Forward gear
backlash
Less than
0.14 mm (0.0055 in)
More than
0.42 mm (0.0165 in)
M: Measurement
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
6-61
Lower unit
Shim thickness
To be increased by
(0.28 – M) × 0.67
To be decreased by
(M – 0.28) × 0.67
8. Remove the special service tools from
the propeller shaft.
9. Install the propeller 8, the spacer 9
(without the washer 0), then the washer
A as shown.
NOTE:
Tighten the propeller nut B while turning the
propeller until the propeller can no longer be
turned.
10. Turn the shift rod to the reverse position
c with the shift rod push arm.
11. Turn the drive shaft clockwise until the
dog clutch C is fully engaged.
12. Turn the shift rod to the neutral position
d with the shift rod push arm.
13. Turn the drive shaft counterclockwise
approximately 30°.
63P3F11