ARMY TM 42815-254-24
AIR FORCE TO 38G1-94-2
N O T E
If bearing gage (PLASTIGAGEPR1) method of checking clearance is
used, omit steps e, f, and g.
e.
Check crankshaft journal and crankpin diameter as follows:
(1) Using a micrometer, measure crankshaft journal diameter at two places, 180 degrees apart and at two
points along its length, refer to FIGURE 3-87.
(2) Repeat step (1) for crankpin.
(3) Standard diameter for crankshaft journal is 2.7548 to 2.7533 in. (69.920 to 69.632 mm), with a limit of
2.7560 in. (69.95 mm). Standard diameter for crankpin is 2.0849 to 2.0854 in. (52.918 to 52.930 mm),
with a limit of 2.0862 in. (52.95 mm). Uneven wear standard value is 0.00004 in. (0.001 mm), with a limit
of 0.002 in. (0.05 mm).
(4) If measured values are less than limits, crankshaft must be replaced or reground.
FIGURE 3-87. Crankshaft Journal and Crankpin Diameter
f.
Check crankshaft journal and bearing clearance as follows:
(1) Install main bearings and bearing caps. Tighten bearing cap bolts to 123 ft-lbs (166.8 Nm).
3-137
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