My pentair whisperflo pool pump sparked and smoked ,I noticed water in the electrical on back of pump..

SOURCE: pool pump won't prime

check for air leaks, cover o-ring is common culprit. anything in front of pump can cause this.

SOURCE: pentair whisperflo pool pump motor replacement

No there is a cover on the other side of the motor thet comes off and with a 9/16 wrench holding the shaft - spin the impeller off

SOURCE: Our Whisperflo pool pump has stopped working and

Sounds like you have a bad run capacitor and/or start capacitor. Assuming your bearings are good and the motor spins freely, have you noticed any loud noises, i.e humming, etc.? Sometimes capacitors can go bad. You can check the capacitor by removing that "hump" cover on the top of the motor, if it looks "bloated" it's bad. Be very, very care not to touch the electrical contacts due to high voltage stored in the capacitor. If this is a chronic problem, you may be developing a short in the motor windings and will have to eventually replace the motor. Hope this helps

SOURCE: my pentair whisperflo is making a load squealing

When you have noise in the pump it is usually a rumbel or rattel. If you have a squealing it is probally in your motor and is more than likly a bad bearing. If you have any water leaking at your seal this is probally the problem and it will just get worse. Sorry to say you are very close to a new motor.

SOURCE: My Whisperflo Pool Pump is making a racket. Is

Stick a large screw driver on the motor in the area of the bearings and on the pump housing ... stick the handle to your ear (notice I said to your ear ... not IN your ear) Listen. Often you can determine the source of the noise in this manner.

My money is on the impeller. You will need to replace the seals when you disassemble the pump motor from the pump housing. I found a dime in the impeller recently ...it made a racket until the impeller wore down in that area.