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 TM 55-1905-219-14-11
(Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENT
d. If the alignment varies during rotation, further alignment is necessary, or the marine gear and shaft couplings could
be checked for improper face runout. Face runout on the marine gear output flange can usually be corrected by
repositioning the coupling on its spline. Shaft coupling runout is usually due to an inaccuracy of taper fit, or key
e. 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).
f. 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 again rechecked, and if satisfactory, the coupling is bolted together.
g. When a heavy boat is drydocked, it naturally undergoes some bending. Therefore, it is always good practice to unbolt
the marine gear coupling and prevent bending of the shaft.
6-23
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