1993 600sl no compression left bank

[volvofixer]

and also down to 50 psi on right bank.........found intake valves held open by lifters. tapped the cam followers and valves are now closed and we have compression. wtf? i would love to hear what i cannot even imagine is happening here.

[edsl94]

i hate to think it, but the timing chains? no valves, no compression.

[volvofixer]

let me add, i removed the valve covers and found the lifters holding the intake valves open........after tapping them they released and compression is restored. from zero to 150. i have yet to run it but the compression is back.

[whipplem104]

This was a problem with those and the m119. I can not remember exactly but the cause was too high of oil pressure when cold overpumped the lifters. There was a MB notice for this. Too long ago for me to remember.