Mercury 75 Service Manual page 502

INSTALLATION
1. Grease the drive shaft, shear key, and impeller
bore. Place the plastic sleeve (a) inside the im-
peller (b) and install impeller, shear key (c), shims
(d) nut retainer (e), and impeller nut (f). Turn the
nut tight on the shaft to remove any play between
the impeller and shaft. If the tabs on the retainer
do not line up with the flats on the nut, remove the
nut and turn the retainer over and re-tighten the
nut again.
a - Plastic Sleeve
b - Impeller
c - Shear Key
d - Shims
e - Nut Retainer
f - Impeller Nut
2. Temporarily reinstall the water intake housing in
order to check for impeller clearance. The clear-
ance between the impeller and liner should be
0.030 in. (0.8 mm). Shim washers can be trans-
ferred to either side of the impeller to raise or low-
er the impeller to the correct clearance setting.
The water intake housing can be shifted side
ways a small amount in order to center the liner.
6B-12 - LOWER UNIT
3. After setting the impeller height, tighten the im-
a
b
c
d
e
f
a - Tabs
4. Reinstall the water intake housing with six bolts.
NOTE: If the outboard is used in salt water, apply
Quicksilver Anti-Corrosion Grease around the entire
mounting flange on the water intake housing and also
to the threads on the six mounting bolts.
.03 in. (.8mm)
peller nut snug with a wrench. Secure impeller
nut by bending tabs (a) against the flats on the
impeller nut.
Check clearance around the impeller to make
sure the water intake housing is centered and not
rubbing against the liner. Torque mounting bolts
to 13 lb. (17.6 N·m).
90-830234R3 DECEMBER 1997
a