Hello, there are problems that you solve yourself and there are things that you discuss in advance. Location: -regular dull knocking, no valve clapping. With the help of the ignition gun, we could see that the camshaft wheel deviates from the mark after every 4th or 5th revolution by about a tooth width on both sides. -with an engine stethoscope we could hear the knock more clearly from the 1st piston – Based on the micro camera on the piston surface of the 3rd and 4th piston a bad too Seeing but blank spot -Zahntriebel: ohne Aufschrift (no name)? Is that crucial? First of all 2 videos, maybe there are good ideas, photos follow!!http://www.youtube.com/watch?v=Z7R7DMDg0iA&feature=youtu.behttp://www.youtube.com/watch?v=2xiE25yaKwU&feature=youtu.be Thanks already Panic