bearing noise

[homer simpson]

hi what causes engine bearing noises in the vp at low speed and when you rev it just a little but on the open road you cant notice it because mine has it and the idler pulley has been replaced and it still does it when you spray the bearings in the altenator and the cars done about 263000kms and its a automatic v6

[vn calais manual]

probably balance shaft. does it sound like its coming from inside the inlet manifold

pretty common fromlem in them v6s and to be honest is not worth trying to fix.

also another problem is the timing tensoiners wearing out. they cause a bit of a 'bearing souding' noise sometimes.