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 TM 55-1905-222-14
6-24
ALIGN PROPELLER AND PROPELLER SHAFT (Continued).
operating temperature. When the shafting is
correctly aligned.
At rest, the bottoms of the shaft journals should
be in contact with the bearing material. The
bearing clearance at the horizontal centerline of
the journal should be equally divided.
c. In order to obtain and maintain acceptable
alignment, the fundamentals of long-
established and good practice are as
follows:
(1) Each bearing shall guide and support
the proportionate share of the shafting
weight and load.
(2) When shaft couplings are broken, each
overhanging shaft length will deflect
from the true shaft centerline,
depending upon the amount of over-
hanging shaft weight, the loading and
the location of the bearing supports.
(3) Alignment of sag charts have been
prepared for most vessels showing
relative flange positions and the
angular slopes of shafting with the
coupling bolts have been removed.
With tie bearings adjusted to obtain
these measurements, proper alignment
of the shafting is insured when the
coupling bolts are secures.
d. Methods of Determining Alignment.
(1) The proper location of the bearings on
main propulsion shafting may be
checked by running a line wire. This
consists of rigging supports
6-131
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