TM 9-4310-397-14
6-11. CRANKSHAFT, PULLEY, IDLER GEARS, AND MAIN BEARINGS INSPECTION, REPAIR AND
REPLACEMENT. - Continued
(g)
If journals are tapered, out-of-round, scored or damaged, the crankshaft should be ground. Proper
undersize bearings should be installed.
(3)
Measure main thrust journal width and thrust bearing width per the following (see Figure 6-104):
Figure 6-104. Measure Main Thrust Journal Width
(a)
New main thrust journal width is 1.534 - 1.536 in. (38.90 - 39.00 mm).
(b)
If width is not within specification, replace crankshaft.
(c)
If width is correct, measure main thrust bearing width.
(d)
New main thrust bearing width (standard size) is 1.528 - 1.530 in. (38.80 - 38.85 mm).
(e)
New main thrust bearing clearance (thrust journal width minus thrust bearing width) is 0.004 - 0.008 in.
(0.10 - 0.20 mm).
(f)
Maximum allowable thrust bearing clearance is 0.015 in. (0.38 mm). Oversize thrust washer sets (Figure
6-105, 1) have thrust washers that are 0.007 in. (0.18 mm) oversize. Arrow (2) points toward front of
engine.
Figure 6-105. Main Thrust Bearing
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