Mercury Jet 40 Manual page 52

a - Plastic sleeve
b - Impeller
c - Shear key
4. 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.
5. Temporarily reinstall the water intake housing in order to check for impeller clearance. The clearance between
the impeller and liner should be 0.08 mm (0.03 in.). 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
sideways a small amount in order to center the liner.
MAINTENANCE
d -
e -
f -
48
a
b
c
d
e
ob01413
f
Shims
Nut retainer
Impeller nut