that could be going on is the both side s are hitting bearing could be bad but the over all is to big for the pump cavity then the gaskets gets screwed down it start things rubbing .if you use another pump take cover off and tig weld the ring on . i would put some putty on 3 spots. put the back cover on screw it back down see if there any room by checking the putty if not much used two gaskets till you get room.as for china bearing they could be but for them to go that fast ? i would press pump hub out and rework it with usa parts if you can find any