I have been adjusting OM616 valves on 240D cars in the 1300 position for years. It makes them smooth running.

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Strelnik
Invest in America: Buy a Congressman!

1950 170SD
1951 Citroen 11BN
1953 Citroen 11BNF limo
1953 220a project
1959 180D
1960 190D
1960 Borgward Isabella TS 2dr
1983 240D daily driver
1983 380SL
1990 350SDL daily driver alt
3 x Citroen DS21M, down from 5
3 x Citroen 2CV, down from 6

Using a short feeler gauge leaf, I found that sometimes when I positioned the leaf, it was not quite flat to the intersection of rocker arm and cam lobe. The longer leaf is much more flexible and positions itself more accurately.

May just be my personal ham-handedness.

1300 is fantastic, I use it myself.

Perhaps, I should have been clearer. I was referring to setting the clearances a little looser than standard. Have you tried this?

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1981 240D 4sp manual. Ivory White.