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 TM 55-1905-220-14-11
6-1.
PROPELLER SHAFT AND BEARINGS - MAINTENANCE INSTRUCTIONS
(Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENT
13.
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
drydock. 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 procedure particularly for
future realignment.
a.
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.
b.
As the engine and marine gear 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.
c.
Rotate the marine gear flange coupling 90, 180, and 270 degrees with the feeler blade being moved around
the flange again in each successive position. If the alignment is correct, the feeler gauge will fit snugly, with the same
tension, all around the flange coupling.
6-22
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