Cracks detected under
ultra-violet light
Broken crankshaft
CRANKSHAFT FAILURE
CRANKSHAFT - BROKEN
When a crankshaft breaks it is usually a continuation of a crack that has developed due to excessive harmonic vibration. If these cracks go undetected eventually the shaft will suffer a major break. This usually occurs as the normal load is exceeded and the weakened shaft finally lets go. The crack usually starts around the fillet radius and continues until the journal breaks away from the web.
The design of every shaft has a built in critical point of breakage and will usually break in a similar position every time. This is referred to as the nodal point. The design and weight of the flywheel, shaft and balancer determine this point.
For more information see: Crankshaft/ Cracked
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Cracks detected under
ultra-violet light
Broken crankshaft