Mercury Jet 20 Manual page 79

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Impeller Removal And Installation
INSTALLATION
6
Grease the drive shaft, shear key, and impeller bore. Place the plastic sleeve
(a) inside the impeller (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.
7
Temporarily reinstall the water intake housing in order to check for impeller
clearance. The clearance between the impeller and liner should be .030 in. (.8
mm). Shim washers can be transferred to either side of the impeller to raise or
lower the impeller to the correct clearance setting. The water intake housing can
be shifted side ways a small amount in order to center the casing liner.
MAINTENANCE
a
b
7
c
d
e
f
77
.03 in. (.8mm)