Impeller Clearance Adjustment - Mercury Jet OptiMax 80 Manual

Check the impeller blades occasionally for damage. Use a flat file
to resharpen the leading edges. Sharpen to a 0.8 mm (1/32 in.)
radius by removing material from bottom side only.
a - Leading edge

Impeller Clearance Adjustment

The impeller should be adjusted so there is approximately
0.8 mm (0.03 in.) clearance between the impeller edge and liner.
Operating the jet drive in waters that contain sand and gravel can
cause wear to the impeller blades, and the clearance will start to
exceed 0.8 mm (0.03 in.).
As the blades wear, shims located in the stack outside of the
impeller can be transferred behind the impeller. This will move the
impeller further down into the tapered liner to reduce the clearance.
a - Shims
b - Clearance between impeller edge and liner
MAINTENANCE
a
b -
b
74
b
29079
Top side lifting angle
a
29080