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 TM 55-1905-220-14-10
5-4. MAIN PROPULSION ENGINE/MARINE GEAR - REMOVAL AND RUN-IN
MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ALIGNMENT
19. Engine
NOTE
and
It is important to align the engine and gear only
Marine
when the boat is afloat and NOT in dry-dock.
Gear
During this alignment period, it is also
Alignment
advisable to fill the fuel tanks and add any other
to Pro-
ballast that will be used when boat is in service.
peller
With the engine and gear in position on the
shaft
engine bed, arrangements must be made to
have a controlled lifting or lowering of each of
the four corners of the engine. If threaded holes
are provided in each of the engine mounts,
jacking screws can be used in them. The
engine can be raised by screwing down, or
lowered by backing off the desired amount.
Steel plates must be inserted under the jacking
screws so that the jacking screws will not
damage the engine bed. Lifting can also be
accomplished by the use of properly placed
jacks. Adjustable shims also are available and
can simplify the whole problem, particularly for
future realignment .
( 1 ) It will .also be necessary to move the
engine and gear from one side or the other on
bed to obtain horizontal alignment. This can be
done with a jack placed horizontally between the
engine and the foundation. At the same time, a
straight edge is laid across the edges of the
flanges at the top and side to check the parallel
alignment of the coupling edges.
5-36
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