A DC8-63 WAS RELEASED FOR SVC WITH #1 ENG HIGH EGT AND 1 DEG MARGIN. PREVIOUS EGT OVERTEMP HAD NO TIME RECORDED. COMPANY DID NOT HAVE REQUIRED ENG INSPECTION COMPLETED.

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ON OR ABOUT AUG/SUN/04; SHIP ACFT X WAS WRITTEN UP BY FLT CREW IN ZZZ1. CREW WROTE THEY EXCEEDED MAX EGT 575 DEGS C AND REDUCED PWR TO MAINTAIN 575 DEGS C. THE ACFT WAS WORKED ON IN ZZZ1. THE MAINT IN ZZZ1 SAID THEY FOUND A WIRE LOOSE ON AN EGT PROBE. THEY RAN THE ENG AND ENG STILL DID NOT MEET RATED THRUST AND WAS EGT LIMITED. NO OTHER ENG MAINT WAS DONE IN ZZZ. THE ACFT FERRIED TO ZZZ1 WITH REDUCED PWR ON #1. ON ARR IN ZZZ; I ADVISED MY SUPVR THAT IT WAS UNKNOWN HOW LONG THE #1 ENG WAS ABOVE 575 DEGS C DUE TO THE FAULTY PROBE FOUND IN ZZZ1. THE JT3 EGT SYS IS WIRED IN PARALLEL AND IF PROBE WAS NOT WIRED RIGHT AS RPTED IN ZZZ1; THE COCKPIT EGT INDICATION WOULD READ LOWER THAN ACTUAL ENG TEMP. I ADVISED ENG GO FOR A SHOP VISIT; AS REQUIRED BY P&W JT3D-7 MAINT MANUAL. THE ACFT REMAINED AT ZZZ AND ENG WAS WORKED ON WING. NO EGT PROB WAS FOUND AS WELL AS NO BLEED AIR PROBS. THE ACFT WAS RUN UP AGAIN AND FAILED ITS TRIM CHK ONCE AGAIN. ALONG WITH FAILING; IT WAS SLOW TO SPOOL -- 14 SECONDS. THE FUEL CTL UNIT WAS CHANGED AND ACFT WAS RUN UP. AGAIN THE ENG WAS IN LIMITS FOR SPOOL-UP AND HAD 1 DEG C EGT MARGIN. THIS RUN WAS ACCOMPLISHED IN THE EARLY MORNING; SO AMBIENT TEMP WAS VERY LOW AS WELL AS HUMIDITY. I AGAIN WENT TO MY SUPVRS AND EXPLAINED TO THEM THAT THE MAINT MANUAL CLRLY STATES THAT AN EGT OVERTEMP REQUIRED ENG INSPECTION AND THAT A FUEL CTL UNIT COULD NOT CAUSE THE OVERTEMP PROBS SINCE THERE WAS NO EGT FIX OR BLEED AIR PROBS. THE ENG MUST COME OTS. MY SUPVR TOOK MY CONCERNS TO MGMNT. MGMNT DETERMINED TO CONTINUE ACFT IN SVC WITH #1 ENG ON WING. THE ACFT WAS RELEASED FOR SVC ON AUG/WED/04 WITH A BAD ENG.