What was found
(CAN) DURING AN ANNUAL INSP, VALVE COVERS WERE REMOVED TO INSPECT VALVE GUIDE WEAR, NR 3 AND NR 4 EXH VALVE GUIDES WERE WORN, NR 3 BEING THE WORST, WAS REMOVED FIRST. ON REMOVAL OF NR 3 CYL, NR 3 PISTON WAS DISCOVERED CRACKED AND MISSING A PIECE AT THE RT UPPER PISTON BOSS ON THE SKIRT. AFTER INSP OF THE PISTON, ALL CYLINDERS WERE REMOVED AND NR 2 PISTON WAS FOUND CRACKED IN THE SAME LOCATION. ALL PISTONS AND CYLINDERS WERE REPLACED WITH NEW UNITS.