A B757-200 WAS DISPATCHED WITH THE L NOSE LNDG GEAR WHEEL AND TIRE ASSEMBLY INSTALLED IMPROPERLY.

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THE TECHNICIAN WORKING THE FLT; FOUND METAL SHAVINGS ON THE AXLE INSIDE THE L NOSEWHEEL. ALSO; THE INBOARD BEARING SNAP RING WAS FOUND TO BE OFF THE WHEEL. I CAME OUT TO ASSIST HIM ON THE JOB. WE REMOVED THE WHEEL AND CHKED THE AXLE FOR DAMAGE. NONE WAS NOTED. WE THEN BEGAN TO INSTALL A NEW WHEEL/TIRE; USING THE SAME PARTS SUCH AS THE AXLE NUT; SAFETY BOLTS; ETC. UNFORTUNATELY THE AXLE NUT WASHER WAS MISSING WHEN THE PLANE ARRIVED. WE DID NOT NOTICE THIS DURING THE REMOVAL. WE REINSTALLED IT THE SAME WAY; WITH NO WASHER. THE TRIP WENT TO XXX AND THE SAME CONDITIONS (SHAVINGS) WERE FOUND BY THE FLC DURING THEIR PREFLT. THE WHEEL WAS CHANGED AGAIN; AND THE CORRECT WASHER WAS INSTALLED; AND THE ACFT WAS THEN SERVICEABLE. THE MAIN PROBS/FACTORS AS I SEE IT ARE: 1) FAILURE OF US TO NOTE THE WASHER WAS MISSING ON ARR AT ZZZ. 2) FAILURE TO CLOSELY FOLLOW THE MAINT MANUAL. ON A ROUTINE JOB (INSTALL THE WASHER). 3) RUSHING TO ACCOMPLISH A JOB DUE TO SHORT GND TIME; AND COLD AIR TEMP (20 DEGS F).