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TM 10-4320-324-14
6-7. Engine Assembly Repair (CONT).
(c) Measure each main bearing bore at points 1 and
2 in plane "a," then in the same manner in plane
"b" offset by 90 degrees.
(d) If the recorded value is between 2.933 inches
(74.5 mm) and 2.934 inches (74.519 mm), the
respective bearing is in acceptable condition
and the required preload will be obtained when
bearing halves are installed.
(e) If the recorded bearing bore diameters differ
only slightly from the specified values given
above, repeat the measurements with new
bearing halves installed.
(f)
Insert new bearings.
(g) Position bearing cap, then preload and torque
according to instructions given in Appendix F
and Table F-1.
(h) Using a micrometer, adjust internal dial gauge
set to nominal inside diameter of crankshaft
main bearing bore, 2.757 inches (70.04 mm).
(i)
Gauge each bore at points 1 and 2 in the
vertical and horizontal positions "a" and "b".
(j)
If recordings show that bearing tolerances are
up to 0.0015 inch (0.043 mm) maximum above
value specified above, crankcase is acceptable
for further use.
6-22
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