Heat it up even more, 120 -130°C, wear a heat resistant glove, take the engine and knock it on a flat wooden surface with the rear opening to the table. Usually the bearing just falls out. Once the rear bearing is out, heat up the engine again and now use something made of wood or plastic and push the front bearing out from behind.

To put the new bearings in, place the bearings in the freezer for a few hours, then heat up the crankcase again and they will fall in place.