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 TM 55-1905-220-14-10
5-4. MAIN PROPULSION ENGINE/MARINE GEAR - REMOVAL AND RUN-IN
MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ALIGNMENT (Cont).
NOTE (Cont)
(4) If the alignment varies during rotation, then
further alignment is necessary, or the marine
gear and shaft couplings could be checked for
improper face run-out. Face run-out on the
marine gear output flange can usually be cor-
rected by repositioning the coupling on its
spline. Shaft coupling run-out is usually due to
an inaccuracy of taper fist or key interference.
(5) Some boats are not structurally rigid and
some carry their load in such a way that they will
"hog" or go out of normal shape with every
loading and unloading. Where this condition
exists, it may be necessary to make a
compromise between the top and bottom
coupling clearance by leaving a greater
clearance at the bottom of the marine gear
output flange and propeller coupling. This
clearance might be 0.005 to 0.007 inch (0.013 to
0.018 cm) while the top would maintain the
standard 0.002 inch (0.005 cm).
(6)
During the process of securing final
alignment, it may be necessary to shift the
engine many times. When the final alignment is
secured, the necessary steel or hardwood shims
are made up and the engine and gear is
fastened in place.
The alignment is then
rechecked and if satisfactory, the coupling is
bolted together.
5-38
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