I was doing my valve stem seals on my '90 300E, and when I put the rocker arms back on, it pushes BOTH valves down slightly, so that it won't hold compression now. Before you snug the bolts down, the rocker arm assembly wobbles a little bit, and won't sit flat without pushing the valves down a little bit.
This happened on cylinder 1, and then after turning the engine over with a breaker bar, it seemed like it corrected itself, but it's not correcting itself on cylinder 2. I even tried disabling fuel/ignition and cranking it over a few times and it won't hold compression. What on earth did I do?!?!
I took these pictures, and I don't know if they help, so if you need different photos, let me know what specifically I need to photograph.
If you have any Ideas PLEASE let me know. Thanks!