Checking bent crankshaft for runout
CRANKSHAFT FAILURE
CRANKSHAFT - BENT
Most new crankshafts will attain some bend during normal operation. Up to.004" to.006" may be detectable at time of regrinding. This amount of bend is acceptable and can mostly be removed by regrinding. Crankshafts with more bend should be straightened before regrinding.
Crankshafts with sever bend should be replaced. Crankshafts with bend can be straightened in a special jig. The shaft should always be mildly heated to reduce the chance of developing a crack. All straightened shafts should be crack-tested after straightening.
Crankshafts with badly localised overheating on a flogged journal may have bent at the position of where the web and journal meet. This type of bend can be removed by the use of special shaped punches used against the radius. Again after straightening the radius must be reclaimed and crack-tested. All of these straightening process's can damage the shaft beyond repair and this should be considered with the customer before being attempted.
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Checking bent crankshaft for runout