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 TM 55-1905-222-14
6-23
REPAIR PROPELLER AND PROPELLER SHAFT (Continued).
0.003 inch total, giving an unacceptable
performance, must be rectified or replaced
by a new shaft section.
c. Bent Shafting. Approval by the appropriate
authority should be obtained prior to
straightening severely bent shafting.
Repair to the shafting sections can be done
by the spot heating method, or electric
straightened by mechanically controlled
forces.
d. Cracks In Shafting.
Cracks found in
propulsion shafting should be thoroughly
probed to determine the depth and length
of the cracks. If shafting is determined to
be repairable, weld crack by an approved
method.
e. Eccentricity. The dial indicator runout for
any length of shafting, with respect to the
axis of rotation and exclusive of journals
and ends, should be limited to an
eccentricity of approximately 0003 inch.
If, when the shafting is rotated 360
degrees, runouts greater than this figure
are found, this eccentricity should be
reduced to the lowest possible limit. A
record should be kept of all installed
shafting where eccentricities exceed 0 003
inch.
Shafting should be replaced if
objectionable vibration is still present.
f.
Electrolytic Action. Zinc protector collars
on the shafting should be replaced as
necessary. Steel shafting that is exposed
to sea water should be protected from
electrolyte action by a rubber or plastic
protective covering
when electrolytic
action occurs between the steel shaft and
the bronze bearing journal sleeve.
6-128
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