A B747-200 WAS DISPATCHED IN NON COMPLIANCE WITH #4 ENG OIL SVC CAP NOT INSTALLED AFTER SVCING. ACFT RETURNED TO THE FIELD.

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ON MY 3RD DAY IN LINE MAINT AT ACR; I WAS ASSIGNED TO OILING ENGS. I WAS TOLD THAT THE ENGS NEEDED SVCED WITHIN 30 MIN OR THEY WOULD HAVE TO RUN THE ENGS BEFORE SVCING. A FELLOW TECHNICIAN SHOWED ME HOW TO RUN THE BROWSER AND HOW TO SVC THE OIL; AND THEN I WAS ON MY OWN. 4 PLANES ARRIVED IN A SHORT PERIOD OF TIME; BUT AT THE END OF THE DAY; I FELT I DID A GOOD JOB. THE PLANE IN QUESTION ARRIVED ABOUT XA50; SVCED AT XB00 AND PUSHED OUT AT XE00. AT ABOUT XG00; MAINT CTL CALLED AND ASKED IF I NOTICED ANY EXCESSIVE OIL LEAKS. I TOLD THEM NO; THEY SAID THEY WOULD MONITOR. I LOOKED AT THE ENG OIL USAGE FOR THE B747'S #4 ENG; IT WAS USING ON AVERAGE OF 3 QTS PER FLT LEG; I PUT IN 4 QTS. I THOUGHT THERE MUST BE AN OIL LEAK. LATER THAT NIGHT; THE DIRECTOR CALLED AND INFORMED ME THAT THE PLANE WAS TURNED AROUND IN FLT. THE TECHNICIANS FOUND THE DOOR OPEN; THE CAP MISSING; AND THEY PUT 18 QTS OF OIL IN THE ENG. I TOLD HIM THAT I FELT I DID THE JOB CORRECTLY AND ASKED IF THE DOOR WAS OPEN; SHOULDN'T THE SO HAVE SEEN IT ON WALKAROUND (WHICH THE TECHNICIAN WHO DID PUSHBACK SAID WAS DONE AT XD40). HE SAID IT DIDN'T MATTER; BECAUSE I SIGNED THE LOGBOOK. I HAVE BEEN TOLD THAT THE CAP HAS BEEN OFF BEFORE AND MADE THE FLT; BUT THAT THE OIL FLAPPER VALVE WAS INOP.