| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-219-14-11
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. Dur-
ing 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
|
||
|
||
