As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TOTAL INTERNAL CRANKSHAFT FAILURE AT CHEEK BETWEEN #3 AND #4 CONNECTING ROD JOURNALS CAUSING CRANKCASE TO COMPLETELY SEPARATE IN THE CENTER. CRACK APPEARS TO HAVE STARTED IN THE REAR THRUST RADIUS OF #3 CONNECTING ROD JOURNAL. PILOT HAD REPORTED ENGINE ROUGHNESS THE PREVIOUS DAY OF THE INCIDENT AND CONTINUED ENGINE ROUGHNESS AND ABNORMAL ENGINE NOISE THE DAY OF THE INCIDENT. SLIGHT METAL FOUND IN OIL FILTERS