Replaceable Jet Drive Shear Key - TOHATSU MD 35B2 JET Owner's Manual

M25 Jet Drive
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
b
a - Shims
b - Clearance between impeller edge and liner
Check the impeller clearance by sliding a feeler gauge through the intake grate and measure
the clearance between the impeller edge and liner. If adjustment is required, refer to Impeller
Removal and Installation.

Replaceable Jet Drive Shear Key

The jet drive is equipped with a shear key to protect it in the event of a lodged impeller. The shear
key can be reached by removing the water intake housing and impeller. Grease the drive shaft,
shear key, and impeller bore when replace these parts. Refer to Maintenance-Impeller Removal
and Installation.
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