A B767-300 R NOSE TIRE AND WHEEL ASSEMBLY WAS REPLACED BUT THE WHEEL SPACER WAS OMITTED. FOUND AND REPLACED PRIOR TO DISPATCH.

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I WAS INSIDE IN A HANGAR DOING AN OVERNIGHT 'TRANS' CHK. ONE OF THE ITEMS TO BE CHKED ON THE 'TRANS' CHK WAS TO CHK TIRES FOR CONDITION. I FOUND THE R NOSE TIRE WORN TO LIMITS. I THEN MADE AN ENTRY IN THE LOGBOOK STATING IT WAS OUT OF LIMITS. I THEN PROCEEDED TO CONTINUE WITH THE 'TRANS' CHK. AROUND XA15; I STARTED TO CHANGE THE B767 R NOSE TIRE PER MAINT MANUAL. I FINISHED WITH THE TIRE AROUND XB00. I SIGNED THE TIRE OFF AROUND XB35 STATING I REPLACED THE R NOSE TIRE AND WHEEL ASSEMBLY PER MAINT MANUAL. NOTE: WHEN THE TIRE WAS OFF OF THE AXLE; I DID A VISUAL INSPECTION OF THE OLD TIRE; THE NEW TIRE; AND OF THE AXLE TO MAKE SURE IF ANYTHING WAS WRONG WITH THE TIRE OR AXLE. I FOUND NOTHING TO BE WRONG OR OUT OF PLACE. I FINISHED OUT THE NIGHT AND WENT HOME AROUND XG30. THE NEXT NIGHT WHEN I RETURNED TO WORK; I WAS INFORMED THAT THE R NOSE TIRE I CHANGED THE NIGHT BEFORE WAS NOT DONE PROPERLY. I WAS INFORMED THAT THE WHEEL SPACER WAS MISSING FOR THE R NOSE TIRE AND IT WAS FOUND IN THE MORNING BY THE WHEEL AND BRAKE SHOP WHEN THEY HAD RECEIVED THE OLD TIRE. WHEN THEY HAD RECEIVED THIS INFO; THEY IMMEDIATELY CONTACTED THE DAY SHIFT FOREMAN. HE HAD THE MECHS WORKING THE AIRPLANE CHANGE THE R NOSE TIRE PER MAINT MANUAL AND MAKE SURE THE SPACER WAS INSTALLED. FORTUNATELY THE ACFT DID NOT FLY THAT DAY; IT WAS OTS FOR AN ENG CHANGE. IT WASN'T RETURNED TO SVC UNTIL SOME TIME AFTER XN48 ON JAN/SUN/05. NO ACFT DAMAGE WAS RPTED; FLT DELAYS OR CANCELLATION OR TURNBACKS BECAUSE OF THIS INCIDENT.