TM 5-4310-379-14(k)Clean crankshaft (3) with dry cleaning solvent and dry thoroughly.(I)Inspect keyway and replace crankshaft if cracked or worn.NOTEMaximum runout on the intermediate journal must not exceed .003 in. (.007 cm).(m)Using a dial indicator, check the main journal runout. If the runout exceeds .003 in. (.007 cm),replace the crankshaft.NOTEThe main bearing journal diameter is 3.499-3.500 in. (8.887-8.8900 cm) and diameter of connectingrod journal is 2.749-2.750 in. (6.982-6.985 cm). Taper on journals of used shaft should not exceed.0015 in. (.0038 cm), and out-of-round should not exceed .0010 in. (.0025 cm). The maximum taperon new crankshaft is .0005 in. (.0012 cm) and maximum out-of-round is .00025 in. (.00063 cm).(n)Measure the main and connecting rod bearing journals. If measurements exceed the specifiedlimits, replace crankshaft.(o)Inspect crankshaft for cracks by using the magnetic particle method, fluorescent magnetic particlemethod or fluorescent penetrant method.(p)Inspect oil seal for wear or damage.(q)Inspect bearing shells for scoring, pitting, flaking, chipping, cracking, loss of babbit, or signs ofoverheating. If any of these defects are present, replace bearing shells.(r)Inspect back of bearing shells for bright spots which indicate they have been moving in caps orcylinder block. If these spots are present, replace bearing shells.NOTEMinimum thickness of a worn main bearing shell is .153 in. (.388 cm).(s)Using micro meter ball attachment, measure the bearing shells, and if dimension is not withinspecified dimension, replace shell.NOTEClearance between main bearing journals and inside diameter of bearing shells, when installed,shall not exceed .006 in. and .0014-.0044 in. (.0035-.0111 cm) for new parts.(t)Measure clearance between main bearing journals and inside diameter of bearing shells, if clearanceexceeds specified dimension, replace bearing shells.5-97
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