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ALIGNMENT
To obtain accurate alignment the flexible mountings must
be adjusted until alignment is attained, and the
mountings must be locked in position. The engine /
gearbox unit has to be aligned with the propeller shaft in
two ways. The traditional engine alignment method
involves measuring with either feeler gauges or a DTI
ANGULAR ALIGNMENT
Engine / gearbox
flange
PARALLEL ALIGNMENT
Engine / gearbox
flange
The engine mountings and the couplings must now be tightened in position and the alignment re-checked.
(Dial Test Indicator) mounted on a magnetic foot so that
they are aligned within 0.125mm (0.005"). (Obviously
the propeller shaft must be centered in the stern tube and
running true - through the cutless bearing; if the propeller
shaft is not correctly centered you will experience
vibration).
Propeller
shaft
Propeller
shaft
9
Angular Mis-alignment
6
Angular Mis-alignment
Parallel Mis-alignment
7
Parallel Mis-alignment
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