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 TM 55-1905-220-14-10
5-5. MARINE GEAR MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENT IN CRAFT
29. Engine and
marine gear
alignment
to propeller
shaft
NOTE
It is important to align the engine and gear only when the boat is afloat, and NOT 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.
5-146
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