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It probably is a bearing. You will need to pull the alternator apart to replace the bearing(s). A very simple job really. You will probably need a puller to get the bearings of the shaft.My alternator is making a grinding/whirring noise, could it be a bearing? If so how do i replace it?
You can replace the pulley for around $30 from Supercheap, Repco, Bursons etc. The bolt that holds it on is left hand thread (turn it clockwise to undo it.)Just took the belt off and spun all the pulleys, it's the tensioner pulley! Is there a bearing in that or do i need a new assembly?