Replacement idler pulley for AC belt, 1973 Duster /6
You can drill those 4 spot welds out, but bearing cap will still not come off. It it fused together with some kind of copper looking stull-will not come apart without ruining the pulley. I tried!
I've seen one that requires drilling out four spot welds to split the pulley halves, releasing the bearing. It could be bolted or the spots rewelded with a new bearing installed.