What was found
HOBBS - 3,213.6 HOURS. OIL APPEARED AROUND NR 1 CYLINDER PUSH ROD TUBES. SEALS REPLACED, GROUND CHECK OPS GOOD. AFTER FLIGHT, OIL APPEARED AGAIN. REMOVED NR 1 CYLINDER, FOUND CYLINDER SLEEVE CRACKED APPROXIMATELY THREE-FOURTHS OF CIRCUMFERENCE. LOG REVEALED THIS TO BE THE 3RD CYLINDER ON NR 1 IN 4 YEARS. PISTON P/N LW 10545 SHOWED SIGNS OF BEING HOT. SUSPECT OIL NOZZLE FOR PISTON COOLING INOPERATIVE. REPLACED NOZZLE, P/N 73772. REPLACED CYLINDER KIT, P/N 05K21116-3, AND ASSOCIATED SEALS AND GASKETS. PISTON SKIRT WAS OIL COKED AND DISCOLORED.