What was found
(CAN) IT WAS REPORTED TO MAINTENANCE THAT THE RT ENGINE HAD EXPERIENCED SOME TROUBLE. THE ENGINE WAS SHUTDOWN (DURING FLIGHT) AND PROP WAS FEATHERED. THE AIRCRAFT COMPLETED THE FLIGHT TO THE NEAREST AIRPORT AND LANDED WITHOUT INCIDENT. THE PRELIMINARY INSPECTION INDICATES THAT THE NR 4 CYLINDER CONNECTING ROD BROKE THROUGH THE PISTON PIN HOLE. THIS PERMITTED THE PISTON TO BECOME DISLODGED AND THE CYLINDER ASSEMBLY WAS SUBSEQUENTLY FORCED FREE OF THE ENGINE BREAKING ALL THE CYLINDER BASE HOLD DOWN STUDS. THE ENGINE WILL REQUIRE MAJOR REPAIRS. (TC NR 20070503003)