What was found
PILOT NOTED THE ENGINE WOULD MISS THEN RUN. PILOT MADE PRECAUTIONARY LANDING. THE VALVE COVER ON CYLINDER NR 2 HAD A HOLE IN IT. INVESTIGATION SHOWED THE PUSHROD TUBE SPRING LYC P/N LW14995 BROKE AND SEPARATED AT THE HOLE FOR THE HOLD-DOWN STUD. THE BROKEN PART JAMMED BETWEEN THE VALVE COVER AND THE INTAKE VALVE CAUSING THE ENGINE TO MISS. INSPECTION OF THE REMAINING 3 CYLINDERS REVEALED ALL 4 OF THE LW13428 LOCKPLATES WERE CRACKED OR BROKEN. THE PARTS HAD A TT OF 150 HRS AND WERE PLACED IN SERVICE 3-14-94. THIS INVESTIGATION IS ONGOING.