What was found
(CAN) ENGINE WAS O/H ON 2013-10- 29 WITH NEW CYLINDER KITS, PN : 051, 23037. ACFT WAS RETURNED TO SERVICE FOR OPERATION. ON 2015-0714, WITH A TOTAL OF 389.9 HRS. ALL CYLINDERS WERE REMOVED DUE TO HIGH OIL CONSUMPTION. REPAIRS WERE MADE BY AN AMO AND RE-INSTALLED. ON 2015- 10-19 WITH A TOTAL OF 47.3 HRS. SINCE LAST MAINTENANCE ISSUE 437 .2 HRS. SOH, ALL 4 CYLINDERS WERE REMOVED DUE TO HIGH OIL CONSUMPTION, AND REPAIRED BY SAME AMO AND REINSTALLED. ON 2016- 01-11, WITH A TOTAL OF 16.2 HRS. SINCE LAST MAINTENANCE ISSUE, 453 . 4 HRS SOH. ALL 4 CYLINDERS WERE REMOVED DUE TO LOSS OF POWER DURING TAKEOFF, CAUSING AN UNSCHEDULED LANDING WITH NO EVENT. AFTER FURTHER INSPECTION, ALL 4 BOTTOM SPARK PLUGS WERE FILLED WITH OIL. THE 4 CYLINDERS WERE REMOVED AND QUARANTINED BY THE SAME AMO AND 4 O/H CYLINDERS WERE REINSTALLED FOR FLIGHT TRAINING OPERATIONS .