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 (Dial Test Indicator)
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.
mounted on a magnetic foot so that they are aligned
within 0.125mm (0.005"). 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 vibration will be experienced.
Propeller
shaft
Propeller
shaft
21
Angular Mis-alignment
7
Angular Mis-alignment
Parallel Mis-alignment
8
Parallel Mis-alignment