What was found
(CAN) LT ENGINE, LT MAGNETO. DURING A 100 HR INSP, OIL FILTER OF LT ENGINE WAS SECTIONED AND INSPECTED. METAL WAS FOUND IN FILTER. SUCTION SCREEN WAS REMOVED AND INSP, PIECES OF A BEARING DISCOVERED. FURTHER DISASSEMBLY WAS REQUIRED. LT OR RT MAGNETO WAS SUSPECTED. ONCE LT MAGNETO WAS REMOVED, MAGNETO GEAR RETAINER ASSY, AND BEARING DROPPED OUT OF THE ENGINE WITH THE DRIVE COUPLING, DRIVE COUPLING NUT AND COTTER-PIN. GEAR RETAINER BEARING HAD COMPLETELY DESTROYED ITSELF. UPON FURTHER INSP, IT WAS DISCOVERED THAT THE SHAFT OF THE GEAR RETAINER ASSY WAS BADLY DAMAGED. THE BEARING RECESS WAS SERIOUSLY DAMAGED. MAGNETO WAS INSPECTED AND FOUND THE MAG BEARING SHAFT AND ARMATURE WAS DAMAGED BEYOND REPAIR.