What was found
DISCOVERED 3 CRACKED CYLINDERS, PN AEC631397 (F),S/N 54389-23,54589-12,54678-09. CRACKS IN CYLINDERS ARE LOCATED AT THE 17TH FIN ABOUT 3 INCHES UP FROM THE UPPER SURFACE ON THE INTAKE PORT FLANGE. ONE OF THE SIGNS OF THESE CRACKS IS A FUEL STAIN ON THE INTAKE TUBE AND AROUND THE FUEL NOZZLE. OF THE TWELVE CYLINDERS OPERATED ARE MFG PN 631397, 6 HAVE CRACKED. AS A PRECAUTION, REPLACING ALL CYLINDERS IN 54XXX-XX SN RANGE. THIS ENGINE IS RAM ENGINE STC SE3630SW-D (325 HP). IN THE AREA OF THESE CRACKS THE CASTING IS VERY ROUGH AND PITTED.