Hello, I have a problem with my 850 20V 170hp Built. 96. One morning I drove to work about 35 km, when I arrived at work I noticed that in the empty run a slight cracker came out of the engine, but that fluctuated as soon as one gave gas. I did not think much about it, so I drove after work still something pick up. I drove about 120 km on the highway with about 130km/h until I suddenly heard a sudden coming extremely loud clapping and squeaking out of the engine. it still sounds extremely loud as if the camshaft or a piston would hit wrongly. I had to drive with this sound about 3 km further, because I was just in a highway tunnel. I noticed that the oil warning light also flume like in the cycle of a piston ( but I looked oil and it was at maximum, so ok ). Now we have already removed the valve cover and found that the camshaft ran without oil. What can this be about? at once without warning the oil pressure is gone ??? Now we have removed the oil pump and installed a new seal and it seems to me as if the oil pressure is back now. Valve cover built on it again, but it still started immediately. So again valve cover down again and 20 new hydro plungers installed. But then it still ran equally bad. The engine tackers and crawls always as if a piston or a camshaft strikes What can be there, I also know no more. Mfg Henning