As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND NR 6 PISTON ERODED FROM POSSIBLE DETONATION BY UNKNOWN CAUSES. FOUND NR5 CYLINDER CONNECTING ROD CAP MISSING AND INTERNAL DAMAGE TO THE CRANKCASE. NO OIL WAS NOTED ON THE DIPSTICK PRESUMED TO BE FORCED OUT OF THE ENGINE DUE TO EXCESSIVE BLOW BY FROM THE ERODED NR 5 CYL. THE ENGINE WAS SHUT DOWN AND LANDED IN A GRASS FIELD WITH NO DAMAGE TO THE AIRCRAFT. (K)