how did you remove them. i tried news paper and a dowel but the bearing didn't seem to want to budge. maybe i just need to pack more. it was thicker paper so maybe it wasn't pliable enough.When the engine heats up when ran they will eventually fall out and cause big trouble. It is easy to break the block and/or side cover trying to get them out if not careful. Yes, heating the block helps. A very small puller can be used. I have seen bread used to remove them. Yes, bread. Bread pushed into the center hole until full and then a dowel the size of the hole beat into the bearing. Repack and redo. repack and redo. It will eventually drive the bearing out. Been told you could use thick grease also. I have also seen them staked in. Take a sharp punch and dimple the aluminum quite hard around the bearing thus causing them to be tight enough to stay in. the aluminum behind the bearings is quit thin. If you do bust the block behind the bearing you can use a freeze plug of the right diameter to fill the hole.
Probably the best idea^.go to habor freight an buy a bearing removing kit 30 bucks that how I got mine out
what temp? I know aluminum's max temp is typically around 460f... i dont want to warp anything either. I think this might be my best option since the engine is already stripped down.Warm up the block and sidecover in an oven (toaster oven works fine) and they all but drop out on their own. Light tap and they fall out -- watch, they'll be hot.
Thanks and God bless,
Carlson Racing Engines
28 years of service to the karting industry
i would assume the oil gets to over 200F. if the bearings fell out easily at 300F then its not a stretch to think they will at 200-220F.Not really, the block would never get that hot when the motor is in use. If you block is anywhere that temp in the bearing pocket area the bearing falling out is the least of your problems.