TM 9-4310-397-14
Figure 6-102. Measure Bearings
(d)
Measure OD of all respective crankshaft journals at several points around journal. OD of Main Bearing
Journal 3.123 - 3.124 in. (79.34 - 79.36 mm). See Figure 6-103.
Figure 6-103. Measure Crankshaft Journals
(e)
If engine has previously had a major overhaul and undersized bearing inserts were used, above listed ID
and OD dimensions may not be the same as those recorded. However, oil clearance should be within
specifications. Oil clearance is 0.0012 - 0.004 in. (0.030 - 0.10 mm). The maximum serviceable
clearance is 0.006 in. (0.15 mm).
(f)
Use crankshaft journal OD measurements to determine if journal is out-of-round or tapered. Crankshaft
wear specifications are as follows:
1
Journal taper-per-inch of journal length 0.0001 in. (0.25 mm).
2
Journal out-of-roundness 0.003 in. (0.08 mm).
6-85
