Pearson P31-II, Manual

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Once adjusted, the alignment is not likely to require
readjustment unless it becomes necessary to move the
engine, or to perform extensive work on the propeller shaft
assembly. In cases such as this, it is recommended that an
experienced marine mechanic perform the adjustment.
Since it may become necessary to disconnect and reconnect
the coupling at one time or another (some people prefer to
do this when the boat is hauled), and since this procedure,
as well as the procedure for simply checking the alignment
are not extensive, they have been included in the following
paragraphs:
WARNING! ENSURE THAT THE ENGINE '1OFF/ON" SWITCH IS OFF AND
REMOVE THE KEY TO MAKE CERTAIN THAT THE ENGINE CANNOT BE
STARTED DURING THE FOLLOWING PROCEDURES.
4.6.2.1 Flexible coupling connector
Your shaft assembly includes a flexible coupling connector
specified for your engine. This coupling connector is
installed to further reduce vibration in the propulsion
assembly in addition to the flexible engine mount.
Together with a properly aligned engine and shaft these
features will provide the smoothest and quietest running
engine possible.
NOTE: THE FLEXIBLE COUPLING CONNECTOR WILL NOT ELIMINATE
THE VIBRATION FROM A POORLY ALIGNED ENGINE.
4.6.2.2 To disconnect coupling
Remove the connecting bolts from the shaft coupling, and
move the two mating surfaces apart.
CAUTION! IF IT IS NECESSARY TO PRY THE COUPLING APART, USE
CARE NOT TO SCAR THE TWO MATING SURFACES.
4.6.2.3 To check alignment
Ensure that the two mating surfaces on the shaft coupling
are clean.
Pull the shaft forward until the flange faces come gently
into contact, and attempt to insert a .OO~ feeler gauge
between the faces. Do this at the 12, 3, 6, and 9 otclock
position on the flange.
Rotate the propeller shaft 180 degrees and repeat the step
above.
If the feeler gauge can be inserted at any point on the
flange, the engine and shaft in need of alignment. If this
is the case, an experienced mechanic should perform the
adjustment.