"Klonk" when I cross the rails of  street cars

The dead  one at le left and a used one at the rightThis noise seams to come from the left wheel. The silent block was dead. See picture (the dead  one at the left and a used one at the right).

How to repair: Really easy I'm surprised.
 

About 20 minutes needed the fist time then perhaps 5 minutes.
 
 

Pages about the XJS ?