A DEHAVILLAND 8 RPTED A PROP DISCREPANCY IMMEDIATELY AFTER A PROP BLADE WAS REPLACED. CAUSED BY A BEARING RACE FAILURE.

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ON JUL/SUN/03; I RPTED FOR DUTY AT XA30 HRS. I WAS INFORMED BY THE LEAD MECH THAT A #2 ENG; #2 PROP BLADE CHANGE WAS IN PROGRESS; AND THAT WE WOULD BE INVOLVED IN THE INSTALLATION ON OUR SHIFT. THE PROP BLADE HAD BEEN REMOVED BY THE PREVIOUS SHIFT; AND WE WOULD BE WAITING FOR A PART TO BE FLOWN IN (BALL SEPARATOR). I WAS ALSO INFORMED I WOULD BE THE DELEGATE INSPECTOR SINCE THE WORK WOULD BE A 'REQUIRED INSPECTION ITEM.' WHEN THE BALL SEPARATOR ARRIVED THE INSTALLATION PROCESS WAS INITIATED UTILIZING THE ACR WORK CARD #61-10-07R (PROP BLADE R&R). THE PROC WAS FOLLOWED; COMPLETED AND ACFT RUN-UP AND LEAK CHKED. WITH TASK COMPLETED; LOGBOOK 'RII' BLOCK WAS SIGNED AND ACFT RELEASED FOR SVC. ON JUL/MON/03; I WAS INFORMED BY MY SUPVR THAT A VIBRATION DISCREPANCY WAS RPTED BY THE FLT CREW IN ZZZ1 ON JUL/WED/03; ON #2 ENG OF ACFT. A MAINT CREW WAS SENT TO ZZZ1 AND THE #2 PROP REQUIRED REPLACEMENT DUE TO DAMAGE FOUND AT THE #2 PROP BLADE HUB AREA. I WAS ALSO TOLD THAT THE PROP MANUFACTURE REPRESENTATIVE WITH ACR SUSPECTS IMPROPER ASSEMBLY OF THE #2 PROP BLADE AFTER INITIAL REVIEW OF THE PROP. AS OF THE SUBMITTAL OF THIS RPT; I UNDERSTAND AN ANALYSIS OF THE REMOVED PROP IS BEING COMPLETED BY ACR PROP SHOP. DETAILS HAVE NOT BEEN RELEASED TO ME AS OF THIS DATE AND TIME. ALTHOUGH I FEEL EVERYTHING WAS FOLLOWED PROCEDURALLY FOR THIS MAINT TASK; SOME WORKING CONDITIONS CONCERN ME: ACR HAS CLOSED 2 MAINT FACILITIES RECENTLY. A TREMENDOUS AMOUNT OF WORK HAS BEEN SHIFTED TO ZZZ LINE MAINT; WITH NO INCREASE IN STAFFING; OR IMPROVEMENTS IN WORKING CONDITIONS. ALL MAINT TASKS ARE DONE ON THE RAMP; IN ALL WX CONDITIONS. MAINT TASKS THAT HAVE NEVER BEEN DONE ON THE ZZZ LINE ARE BEING SCHEDULED THERE NOW. LACK OF MANPOWER IS A CRITICAL ISSUE FOR THE AMOUNT OF ZZZ FLTS. FORMAL TRAINING FOR SOME OF THESE MAINT TASKS IS NON-EXISTENT. IN REVIEWING MY TRAINING RECORDS; I FIND NO RECORD OF PROP BLADE REMOVAL/REPLACEMENT TRAINING. ONLY 3 MECHS WERE ON DUTY THIS PARTICULAR SHIFT; AND I WAS PLACED IN THE DELEGATED INSPECTOR ROLE BY DEFAULT (LACK OF MANPOWER). CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACTUAL CAUSE OF THE PROP VIBRATION WAS THE REPLACED BLADE BEARING OUTER RACE HAD FAILED. THE RPTR SAID THE COMPANY NEVER DIRECTLY ADVISED THE TECHNICIANS OF THE BLADE BEARING FAILURE BUT THE INFO WAS GATHERED FROM SEVERAL UNOFFICIAL SOURCES. THE RPTR STATED THE PROP MANUFACTURER'S REPRESENTATIVE STATED BEFORE THE PROP TEARDOWN THAT IT WAS IMPROPER INSTALLATION AND ASSEMBLY OF THE #2 BLADE THAT CAUSED THE VIBRATION. THE RPTR SAID NONE OF THE 3 PERSONS WORKING THE PROP BLADE REPLACEMENT WERE TRAINED ON PROP MAINT. THE RPTR STATED WITH MAINT FACILITY CLOSURES AND A CONSTANT TURNOVER OF TECHNICIANS XFERRED FROM SHOPS TO LINE WORK MOSTLY UNTRAINED THE SIT HAS BECOME CRITICAL.