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 TM 55-1905-220-14-4
3-54. LINE SHAFTING (PORT SIDE ONLY) - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENT
NOTE
It is important to align the engine and gear only when the boat is
18. Engine
afloat, and NOT in drydock. During this alignment period, it is also
and
advisable to fill the fuel tanks and add any other ballast that will be
marine
used when the boat is in service. With the engine and gear in position
gear
on the engine bed, arrangements must be made to have a controlled
alignment
lifting or lowering of each of the four corners of the engine. If threaded
to pro-
holes are provided in each of the engine mounts, jacking screws can
peller
be used in them. The engine can be raised by screwing down, or
shaft
lowered by backing off the desired amount. Steel plates must be
inserted under the jacking screws so that the jacking screw 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 the 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.
(2) As the engine and marine gear then comes into its aligned
position, it will be possible to match the male and female
halves of the output flange and propeller coupling, and
prepare for bolting together. Care should be taken not to burr
or mar this connection because the fit is very
3-978
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