TM 5-4320-302-14
6-18. CRANKSHAFT ASSEMBLY (CONT)
Location/Item
Action
Remarks
JOURNAL DIAMETER
MAIN BEARING JOURNALS
inches
NORMAL AND UNDERSIZES
(millimeters)
2.5185 to 2.5193
Normal
(63.971 to 63.990)
2.4989 to 2.4996
First undersize
(63.471 to 63.490)
2.4792 to 2.4799
Second undersize
(62.971 to 62.990)
2.4595 to 2.4602
Third undersize
(62.471 to 62.490)
12.Crankshaft
a.
Measure diameter of
center bearing
crankshaft center bearing
journal
journal at points 1 and 2
and along axis A and B
with micrometer. Measure
width of journal at point
3. Measure radius of
fillets between center
bearing journal and crank
cheeks.
b.
Nominal center bearing journal
diameter should
be 2.3611 to 2.3618 inches (59.971 to 59.990
mm). If any measurement is outside the speci-
fied limits, the crankshaft must be replaced.
However, if journal is evenly worn, not out-of-
round, and main bearing journal and crankpin
diameters are within their specified limits, only
center main bearing supports need be replaced.
6-148
