Yamaha F15B Service Manual page 138

LOWR
7. Add or remove shims if out of specifica-
tion.
Forward gear
backlash
Less than
0.19 mm (0.0075 in)
More than
0.86 mm (0.0339 in)
M: Measurement
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40,
and 0.50 mm
8. Remove the special service tools from
the propeller shaft.
9. Apply a load to the reverse gear by
installing the propeller 8 without the
spacer 9, then the washer 0 and nut q
as shown.
9
10. Tighten the propeller nut.
Propeller nut:
2 N·m (0.2 kgf·m, 1.5 ft·lb)
11. Slowly turn the drive shaft clockwise and
counterclockwise and measure the back-
lash when the drive shaft stops in each
direction.
6-27
Lower unit
Shim thickness
To be decreased by
(0.52 - M) × 0.43
To be increased by
(M - 0.52) × 0.43
8
q
0
6B460600
Reverse gear backlash:
0.95–1.65 mm (0.0374–0.650 in)
12. Add or remove shims if out of specifica-
tion.
Reverse gear
backlash
Less than
0.95 mm (0.0374 in)
More than
1.65 mm (0.650 in)
M: Measurement
Available shim thicknesses:
0.10, 0.20, 0.30, 0.40, and
0.50 mm
NOTE:
9 If both the forward and reverse gear back-
lashes are larger than specification, the pin-
ion gear may be too high.
9 If both the forward and reverse gear back-
lashes are smaller than specification, the
pinion gear may be too low.
13. Remove the special service tools, then
install the water pump assembly.
6B760610
Shim thickness
To be decreased by
(1.3 - M) × 0.43
To be increased by
(M - 1.3) × 0.43
6D45F11