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 TM 55-1905-221-14-3
6-16
PROPELLER, PROPELLER SHAFT, AND STUFFING BOX (Continued)
LOCATION/ITEM
ACTION
REMARKS
IREPAIR (Cont)
18. Propeller
a. Pitted Shafting. Cases of
Shaft Assembly
severe pitting in outboard
shafting, resulting from
damaged or porous covering,
should be reported to the
appropriate authority who
will decide whether the shaft
is suitable for further
service. If the pitted
shafting is approved for
reconditioning, the sharp
edges of the pits should be
well rounded by grinding and
the corroded areas should be
dressed down to the solid
metal surface. Ground out
pits and corroded areas, if
extensive and of shallow
depth, should be filled with
approved cavity build-up
material. Pits and corroded
areas beyond allowable depth
should be build-up by welding
and covered with a protective
rubber or plastic material.
b. Vibrations. If objectionable
vibrations exist, the shafting
sections should be removed and
checked for straightness.
Dial indicator run outs of
shafting ends, measured at the
propeller or coupling tapers,
should total less than 0.003
inch (0.0015-inch eccentricity),
which should prevent excitation
of the first-order vibrations
(one vibration per shaft
revolution). Runouts in
excess of 0.003 inch total,
giving an unacceptable per-
formance, must be rectified
or replaced by a new shaft
section.
6-184
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