I have a spare motor and pump that I'm trying to tear down and overhaul. Tried an impact but it didn't help. When I tried to take off the four bolts holding the pump housing together all four sheared off. I still have the whole assembly together (motor, impeller housing and body) and I tried to pry off the impeller housing to split it but it's still stuck. I think it's from the remaining bolt bodies being bloated by rust and seized in the impeller housing section.
Any helpful ideas on how to get this thing apart ??
Is the pump plastic and if so can acid be used to eat away the metal/rust to try and get the parts free ??
If I get it apart any ideas on how to get the rest of the bolt out of the pump/filter basket body section ??