Impeller screws off to the left. on most motors you can use a 7/16 wrench to hold the rotor still as you unscrew the impeller , go under the thermal limiter switch, its by the ground screw . you will need to wiggle it in to get past the wires .. use back of screwdriver handle to install white portion of seal,. do not touch these shinny parts with you fingers ! or the screw driver ! prime the pump with water after every repair, don't starve the pump for water, if you do watch for the wet spot and replace the shaft seal ASAP ! .. jay your local pool pump motor repair guy in longwood Florida .. home of the pool pump repair puppy, the sign of a bark'n good deal