one problem afer another!#* on 4 cyl. turbo engine , i replaced the head gasket and while i was into it also replaced the timing belt. the first time i ran the engine i saw white smoke in the exaust and i am sure it is antifreeze ,i think it is comming from the turbo cooling system, is there a seal or o ring which could be damaged from overheating ? has anyone run across this problem ? any help or ideas very welcome.

The coolant you see in the exhaust may be left over from the blown head gasket. I have had some cars take 15 or 20 minutes of driving to burn off all of the moisture in the exhaust system after a blown head gasket. You might be able to bypass the coolant lines to the turbo and see if the problem goes away. Sorry I can't answer your question about the turbo seals or o-rings.