Hello, I drive my Toledo For 1/2 years at 115 tkm it has been converted to car gas. Currently the car has 160tkm down. And for a short time the engine has started knocking. Knocking sound Metallic low tone (statement of the Seat Master) at higher speed is getting faster. In the cold condition loud, that even the passersby turn around, and in the warm hardly audible. Engine runs uneasy even for a five cylinder. Had presented the car at several workshops and no was able to tell me exactly what that is. I paid 90€ for the examination at Seat with the result that the conrod bearing was knocked out on the fifth cylinder. I then changed this which did not lead to any success. Since the master of the Seat still held on to his theory that something was not right on the fifth cylinder, I drove to an independent one. The latter looked at the old conrod bearing with the result that these were completely in order (unnecessary change…) I have spent two evenings exposing the valve cover to at least look at the camshafts (all extremely attached the shock bar with headlights and radiator had to be lowered). Unfortunately, I am also not an expert only hobby hobby hobbyist in this regard. Now the questions: how do I find out if what is wrong with the camshaft? Can you measure it? How sleep can the chain be, who n the engine is off (the tensioner is hydraulic)? Can you change the chain without having to remove the transmission or the motor? How can you determine if the tensioner is defective? I also noticed one thing when turning the engine (27th nut on the belt wheel) and the second man focuses on the chain, when the chain has about a round run through has relaxed this strongly (can you almost pull off the gears) and suddenly the mi I hope you can help me. Yours sincerely DKGBH