As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WAS INVOLVED IN A PROPELLER STRIKE, NO CRANKSHAFT DAMAGE WAS FOUND AT THAT TIME. ENGINE WAS RETURNED TO SERVICE AND A CRACK DEVELOPED IN THE CRANKSHAFT FLANGE, CRANKSHAFT WAS REMOVED FROM THE ENGINE. THE CRACK MOST LIKELY ORIGINATED FROM A SUBSURFACE DEFECT THAT WAS NOT DETECTIBLE WITH MAG PARTICLE INSPECTION.