As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PISTON IN NR 4 CYLINDER SEPARATED AT THE PISTON PIN BOSS AREA ALLOWING THE CONNECTING ROD END TO PROTRUDE THROUGH THE ENGINE CASE AND THE COWLING. THE CYLINDER HAD THE CERMINIL PROCESS PERFORMED ON IT IN APRIL 14,2000 BY THE ECI (ENGINE COMPONENT INC.).THE CYLINDER TAG SHOWS TO HAVE BEEN A COMPLETE ASSEMBLY WHEN PURCHASED.