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 TM 55-1905-219-14-4
3-54.
LINE SHAFTING (PORT SIDE ONLY) - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENT (Cont)
(5) Some boats are not structurally
rigid and some carry their load in
such a way that they will "hog" or go
out of normal shape with every loading
and unloading. Where this condition
exists, it may be necessary to make a
compromise between the top and bottom
coupling clearance by leaving a
greater clearance at the bottom of the
marine gear output flange and propeller
coupling. This clearance might be
0.005 to 0.007 inch (0.013 to 0.018
cm) while the top would maintain
the standard 0.002 inch (0.005 cm).
(6) During the process of securing final
alignment. it may be necessary to
shift the engine many times. When the
final alignment is secured. the
necessary steel or hardwood shims are
made up and the engine and gear is
fastened in place. The alignment is
then rechecked. and if satisfactory.
the coupling is bolted together.
(7) When a heavy boat is dry-docked, it
naturally undergoes some bending.
Therefore, it is always good practice
to unbolt the marine gear coupling and
prevent bending of the shaft.
3-998
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