A B747-400 ON TKOF AT V2 HAD MODERATE BANG AND RUMBLING AND EXCESSIVE EXHAUST GAS TEMP INDICATION. DECLARED EMER AND DIVERTED.

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CAPT X WAS THE PF. MAX THRUST TKOF AT PEK RWY 36L WITH FLAPS 10 DEGS AND A GROSS WT OF APPROX 600000 LBS. AT V2 (157 KTS) WE HEARD A MODERATE BANG AND FELT A SLIGHT RUMBLING. FO X OBSERVED EXCESSIVE EGT ON ENG #3 AND REDUCED THE THROTTLE TO IDLE. SHORTLY THEREAFTER; THE TWR INFORMED US THE #3 ENG WAS ON FIRE. WE PUT THE START SWITCH TO CUTOFF; LEFT THE GEAR AND FLAPS DOWN AND EXECUTED A CLOSE IN BOX PATTERN AND LNDG TO RWY 36R. THE ENG FIRE QRC AND #3 ENG APCH AND LNDG CHKLIST WERE ACCOMPLISHED; COMPLETED ON DOWNWIND. FIRE TRUCKS WERE CALLED OUT AND AFTER RWY TURNOFF; INFORMED US THERE WAS NO FURTHER EVIDENCE OF FIRE AND ESCORTED US TO A REMOTE PARKING SPOT. THE HIGHEST EGT I OBSERVED WAS 738 DEGS C AT START SWITCH CONFIRMATION TO CUTOFF. WX WAS VFR ALTHOUGH VISIBILITY WAS APPROX 3 NM DUE TO HAZE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ENG FAILURE MODE IS UNKNOWN. THE RPTR SAID THE LCL TECHNICIANS OPENED THE COWLING BUT FOUND NO EVIDENCE OF FIRE AND RPTED SOME TURBINE WEAR. THE RPTR STATED THE AIRPLANE WAS REFUSED AND SUBSEQUENTLY WAS #3 ENG MAINT FERRIED TO A COMPANY FACILITY. CALLBACK CONVERSATION WITH RPTR ON ACN 521354 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ENG COMPONENT THAT FAILED IS UNKNOWN AS MAINT HAS SENT NO INFO TO THE CREW.