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Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
5.7 Crankshaft Runout - Measure
Support the crankshaft at front and rear main journals with
V-blocks, and measure the crankshaft runout at the center
main journal with dial gauge.If the runout deviates slightly
from the standard, correct the crankshaft by grinding.If the
value exceeds the standard considerably, straighten the
crankshaft with pressing machine.
If the value exceeds the limit, replace the crankshaft with a
new one.
If the crankshaft is repaired by grinding or pressing, inspect
the crankshaft for cracks and other harmful damage with
magnetic particle inspection.
Crankshaft Runout - Measure
Item Standard value Limit value Remarks
Crankshaft runout
0.04 mm
[0.0016 in.] or less
0.10 mm
[0.0039 in.]
TIR
V-block
Surface plate
1/2
1/2
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