According to the FSM, OM617 non-turbo normal readings are 22 - 24 bars (approx 320-350 psi) - with a minimum compression of 15 bar (220 psi). The OM617 turbo compression norms are 24-30 bar (350-435 psi), with minimums of 220 psi as well. Both have a maximum of 3 bars acceptable difference between cylinders.

My '78 non-turbo readings were all between 300-325, and those readings were on a cold engine (FSM says to do this on a hot engine (80 C), which should result in higher psi's). I'm not sure how you do this on a hot engine...

ryan

__________________
RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE