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TM 55-1905-219-14-10
29. Engine and
marine gear
It is important to align the engine and gear only when the boat is afloat, andNOT
in dry-dock. During this alignment period, it is also advisable to fill the fuel tanks
and add any other ballast that will be used when boat is in service. With the engine
and gear in position on the 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.
(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 critical. Place a 0.002 inch (0.005 cm)
feeler gauge between the flanges of the coupling. The feeler gauge is moved (slid)
completely around the coupling.


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