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Page Title:
Figure 6-12. Checking inside diameter of main bearings |
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 figure 6-12 against the limits specified in
compound, FSN 9150-663-1770, to the
overhaul standards (table 6-2). Replace bearings
threaded area of each main bearing cap stud.
which do not meet these requirements. New
Install a plate washer on each pair of main
bearings must also be dial bore checked. Remove
bearing studs. Install a slotted nut on each main
the main bearing caps and bearing halves from
bearing stud but do not tighten nuts at this time.
the crankcase and check contact surface as
(h) Place a surface plate and dial in-
indicated by Prussian blue, FSN 8010-847-
dicator gage on crankcase flange with gage
8706 transfer. Replace bearings that do not
indicator resting on end of stud. Measure and
record height of each stud. Torque tighten main
make 75 percent contact with crankcase bearing
bores. Repeat dial bore check of new bearings
bearing stud nuts to 500 pound-inches. Alter-
installed.
nately tighten all four nuts on each main bearing
to a torque of 700-825 pound-inches. Measure
the height of each stud after final torque. The
difference between the stud height before and
after torque tightening, indicates stud stretch.
Normal stud stretch is 0.010 to 0.022-in. If any
stud has stretched more than 0.024-in. at 700
pound-inches torque, it must be replaced. Refer
to
6-3
when
replacing
studs.
(i) Install the 14 crankcase tie rods in the
holes provided through the crankcase and main
bearing caps. Equalize the extension of the
threaded portions of the tie rods on each side of
the crankcase. Apply a small amount of antiseize
compound, FSN 9150-663-1770, to the
threaded portions of each tie rod. Install a plate
washer and a 9 / 16 slotted nut on each end of
the tie rods.
(j) Starting at the main thrust bearing
cap, with aid of an assistant to hold the nuts on
the opposite s i d e o f c r a n k c a s e , alternately
tighten all main bearing cap tie rod nuts to 640
Figure 6-12. Checking
inside
diameter
of
pound-inches torque.
main
bearings.
(k) Check the inside diameter of the main
bearings with a dial bore indicator as shown in
6-17
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