Engine Alignment - Beta Marine Beta 50 Operator's Maintenance Manual

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
10
Angular Mis-alignment
7 Angular Mis-alignment
Parallel Mis-alignment
8 Parallel Mis-alignment