bearing

Hello, I can hear a noise coming from the bearing in the wheel which works as the belt tightener (below alternator). Can you tell me where can I find code symbol of the bearing, or do I chave to remove the belt and unscrew it. Can the bearing be changed only or is it one element together with this wheel? thanks for help. JGC 5,2 95 y.

On most, you can replace just the bearing, but it really isn't worth the headache of trying to press them in and out without bending the pulley. Your local Napa should carry the idler pulley in stock.