I finally got around to doing the valve adjustment on my OM616. Just like diesel giant mentions in his how to all of the valves were too tight. I grabbed the clearance on them before I adjusted them.
4
E: 0.20mm
I: 0.06
I: 0.08
E: 0.20
E: 0.20
I: 0.06
I: 0.06
E: 0.23
1

I should notice a difference now given that they were all incorrect. It's hard to say on a 40 year old car if an adjustment has ever been done but regardless I don't think it has been done in a long time.

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1983 240D Manual Transmission
123.123 - 616.912