I found out that my "uberwurfmutter" doesnt fit on the engine anymore, the "Schneckenlinie" (hope that is correct altavista ) on the side of the engine is close to gone. The previous owner tried to weld it on but that didnt work and later he used some plumbingsolutions to get it poorly connected. I ordered a new "uberwurfmutter" before knowing that it was in this condition.
I checked simson-taubert's store and he has a so called "Überwurfmutter für Krümmer, für defekte Gewinde" is this what i need to get the exaust connected to the engine in a proper way?
and what size would i need 0.3 or 0.5mm kleineres Gewinde? The normal "uberwurfmutter" doesnt fit at all so i guess i need a 0.5...