I didn't mean an air-powered wrench, I meant those screwdrivers whose handle is about an inch or two in diameter, about 6" long and made out of steel. You hit the back of the screwdriver with a BFH while trying to unscrew the screws. You may have to go to a tool store or NAPA to get one. A good one should come with the screwdriver bits. The impact helps shock the screws loose. Just check to see if they are staked in place.

Don't sand or media blast the inside of the pump. Just clean it out with a wirebrush and a wire wheel on a drill or bench grinder. Check the bearings for wear. And I don't think the pulley will come off, as it may be pressed onto the shaft. So if the pump is worn, just replace it. Hot motor = Dead motor.

good luck

chip

Preaching the Hot Rod Gospel according to the 4-stroke apostles:

Suck, Squish, Fire and Fumes