Please see my thread in tech section if you can help I can't work out how to transfer it here but maybe it will help others .
Not a typical post but I'm sure some of you here have experience

Link to the OP's original thread:
http://www.peachparts.com/shopforum/tech-help/395319-om617-valves-again-yawn-but.html

If all the valves were tight, it's worth rechecking the clearance. If they're tight again, readjust and continue driving, checking, adjusting until they stay in spec. 260PSI compression is poor. If the valves are still tight, they'll affect your compression results.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]