I suppose you could, but these idler pulley's are not that expensive to replace the whole thing. They do fail (a weakpoint for these motors), but usually give some audible warning, also check for loosness. Do your best to purchase the steel idler pulley and the bearing will come with. When these items do "let go" they can leave you stranded, if you see a problem replace as soon as possible. Hope this helps. "G"
Try to replace only bearing #6203 2Z inside of pulley.
Take off belt, remove bolt in center of pulley, replace with new pulley (comes with bearing). Reverse to install Take off belt, remove bolt in center of pulley, replace with new pulley (comes with bearing).
You can, for about 10% of the price of a new pulley, but you need a bearing press or hydraulic press to do it properly. A new metal pulley usually costs around $30, but the bearing can be obtained for $3 to $4.
Remove the old, damaged idler pulley and replace it with a new one.
Remove the belt, then remove the bolt holding in the idler pulley.
Bearing needs to be replaced
Bearing siezed. Buy new.
Replace the tensioner assembly as one piece.
N1gger
There is a small bearing in there and sometimes they just fail. The bearing can't really be changed so you'll have to buy a new or used idler pulley.
If the idler pulley is frozen, it is high time to replace the timing belt and the idler. And while that job is being done, consider replacing the water pump and thermostat.
It could be a bearing in an idler pulley.