350 degrees is the upper limit for model engine parts. much more above that and you risk permanent deformation of the castings. Never heat hard steel parts (that you want to use again) above 325 as most hardened steels are only dimensionally stabilized to about 385.
ORIGINAL: loughbd
Heat and a nice hard wooden block to whack the case against. It will come out eventually. A little hotter each time. Start in the oven at 350 and work up. It will come out eventually. The front bearing is an easy pushout