The Scout motors that Lionel made, including the one you have, were not really made to repair. Once the plastic casing is broken, that's about it for the motor.

Even with an intact casing, getting all the internal pieces to stay in proper position while putting the casing halves together took 3 hands.

As for getting the wheels off, you will need to either drive the axles out of the wheels with a punch, or use a wheel puller. I tried both, resulting in broken casings. The plastic is very brittle.

The 2034-100 metal motor is a replacement for the plastic motor in the early Scout engines.
http://pictures.olsenstoy.com/cd/locos%5Cloc2034a.pdf

Larry