Impeller Removal And Installation - Mercury Jet 40 Manual

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
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.

Impeller Removal and Installation

If the driveshaft is rotated while the engine is in gear, there is the possibility that the engine will crank over and
start. To prevent this type of accidental engine starting and possible serious injury caused from being struck by
a rotating impeller, always shift outboard to neutral position and remove spark plug leads when servicing the
propeller.
REMOVAL
1. Shift outboard to neutral (N) position.
2. Remove spark plug leads to prevent engine from starting.
MAINTENANCE
b
WARNING
!
N
46
ob01410
ob00351
a