What was found
(AUS) NO1 CYLINDER EXHAUST VALVE SEAT DROPPED CONTACTING THE PISTON AND CAUSING CYLINDER FAILURE - ENGINE WAS BULK STRIPPED AND INVESTIGATION OF NO1 CYLINDER ASSEMBLY FOUND: 1. EXTERNAL SIGNS OF OVERHEATING 2. FUEL INJECTION PIPE FLOW 7PPH - NORMAL IS 30PPH - FURTHERINVESTIGATION FOUND THE OUTSIDE DIAMETER OF THE PIPE WAS 0.124IN COMPARED TO THE OTHER CYLINDER PIPE DIAMETERS OF 0.128IN. ENGINE WAS OVERHAULED IN CANADA - SUSPECT WRONG PIPE FITTED CAUSING LOWER FUEL FLOW RESULTING IN CYLINDER OVERHEAT - UNAPPROVED PART - PERSONNEL/MAINTENANCE ERROR