Impeller fused to pump shaft. Need to remove and replace.

[NoCatharsis]

My pump stopped creating flow, so I removed the casing and found that the impeller had come apart. The outer body of the impeller piece sheared away from the shaft collar that connects to the pump shaft. I have been able to grab the shaft on the opposite end and attempt to unscrew the broken impeller (clockwise), but the impeller will not move. I chipped away all of the plastic from the impeller and found that there is a threaded metal piece embedded inside which is attached to the shaft. My best guess is that the metals have fused together due to heat or corrosion over the years, but I may be mistaken. I am finding the nut impossible to unscrew and could use suggestions on what to do next.

Photos attached of my pump tag, the metal nut currently stuck on the pump shaft, and a used impeller I got from a friend for replacement (which may not fit at all).

I found 2 similar questions from searching history on the forum here:
impeller spins freely, cannot unscrew it - Almost exact same issue, and the owner gave a follow-up further down the post of how he solved the problem (post #7). I have basically done the same things as him, up to his step #3, but I don't have a good idea how to unlock the metal nut after securing the shaft with locking pliers. It sounds like he was able to do it at this point, but I cannot get it to move whatsoever doing the same thing.
Is this impeller broken? - Post #19 on this page gives detail on how to solve the same problem using a bolt and a die. I have never done this before and do not understand the instructions laid out.

Overall my questions are this:

1. Is it possible to remove the old impeller nut from the pump shaft?
2. Could this destroy the pump shaft, or has it already?
3. If the replacement impeller I have will not work, can someone suggest where to find the correct part?
4. I've seen suggestions to also replace the seal while I am doing this. Where can I find a replacement for this too?

Thank you in advance!

 

[ferretbone]

It happens, I see it all the time. Don't worry about the shaft your not going to break or strip it. Use a wrench to hold the back of the shaft, and a pair of channel locks to turn the brass "nut" on the front until it's free. Spin or turn the brass to the left.
Yeap replace the shaft seal too. That part is a must.

 

[NoCatharsis]

It happens, I see it all the time. Don't worry about the shaft your not going to break or strip it. Use a wrench to hold the back of the shaft, and a pair of channel locks to turn the brass "nut" on the front until it's free. Spin or turn the brass to the left.
Yeap replace the shaft seal too. That part is a must.

Any tips on how to loosen it?

 

[drsipe]

If you remove the capacitor from the motor end, you should be able to get a 7/16" wrench into the shaft to hold the shaft. Then you can use either channel lock plyers or I would prefer a pipe wrench to loosen the remaining piece of the impeller. You could try some penetrating oil to help break it free or tap the impeller with a hammer. I wouldn't recommend heat, due to proximity to plastic, but as a last resort, if you can heat the impeller piece without damaging the motor or heating the motor shaft, that may help, but usually it's leverage that wins in the end.

 

[1poolman1]

Any tips on how to loosen it?

On that motor use a 9/16" open-end wrench on the shaft at the back of the motor. It is under the black cap that should be there. A quarter turn left should remove it. Channel lock or Vise-Grip plier on the brass insert and a turn to the left should get it off the motor.