Hello, I had a ZKD damage and have changed it now. The problem now is that if I start the engine, it starts to hit and knock at some point in the upper part of the camshaft. Hydros we have also changed. Somehow it sounds like he doesn’t get oil at the top. Strangely enough, this always goes away for a short time and then comes back again. Now I just let him turn without valve lid and could then see that out of 2 thick Torx bubbles oil r Is that normal or do not have to come out of the small holes of oil??? Does not otherwise know where the beating should come from. Control times are right. Have we certainly set 10 times again. And the valves should not be, because the beating stops now and then… Anyone else an idea that could help me???