Hi!
The secret is to use a propane torch ! Using an oven or heating in water is not the way you do it if you have an old grease engine on hand!

If you have an old engine that has been used a lot then you might have to heat it and cooling it under the tap several times.
Doing it that way the bearing will just fall out if you tap it hard against a piece of wood (lying on the floor, remember you have to have a solid surface to slammed it against)!
Never ever try to hammer the bearing out! That way the tight fit of the bearing surface will get lost.