Polaris PB4 booster pump is leaking @ the shaft-- time for a new set of seals. But---Impeller rusted onto the motor shaft.

Anyone have a trick to getting it unfrozen and removed ?

I've let it soak with penetrating oil for a couple of days--I guess not much of that gets into the threads though, as its supposed to be sealed.

Last resort is to bust off the impeller and hope I can get a wrench onto the nut, eh ?