Hi, I have a Norge (Magic Chef) DU6550P dishwasher that "drains" during the wash cycle. Everything else works fine. I suspect that the drain flapper and/or drain flapper seal is leaking and would like to inspect/replace it.

I've removed the motor and pump housing assembly from the chassis. I think I need to remove the impeller and then the pump volute to gain access to the drain flapper. However, I can't remove the impeller.

I "jammed" the motor shaft and tried turning the impeller clockwise and counter-clockwise, but the impeller won't move. I'm beginning to round the hex on the end of the impeller. Is there a trick to removing the impeller? Do I need a special tool? Does anyone have a service manual for this? Do I need to remove the pump volute and impeller to gain access to the drain flapper?

Thanks in advance for your help.