MAINTENANCE
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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.
a - Shims b - Clearance between impeller edge and liner
6. After setting the impeller height, tighten the impeller nut snug with a wrench. Secure impeller nut by bending
tabs against the flat on the impeller nut.
a - Tabs b - Impeller nut
NOTE: If the outboard is used in salt water, apply Quicksilver or Mercury Precision Anti-Corrosion Grease around
the entire mounting flange on the water intake housing and also to the threads on the six mounting bolts.
7. Reinstall the water intake housing with six bolts. Check clearance around the impeller to ensure the water
intake housing is centered and not rubbing against the liner. Torque mounting bolts to specifications.
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