just change the pulley, i had the same problem with mine, we couldn't figure out where the noise was coming from till it was to late and had to change the engine, i was told it was water pump to bottom end knocking,then the unthinkable happen on m/way .smoke was coming out the back like a war plane just being shot down oil light on, however it did carry 30+ miles to service station,check the oil not a drop in it. top it back up car went to Manchester and back to birmingham all because of the pulley ,valves was opening or closing as should.
