Thanks for your reply's guys.

Things are turning from bad to worse.
Took the head of this morning and found vertical scratches in cylinder # 4.
Piston or rings started to seize in that cylinder.
All cylinders are on or exceeded there 0.2 MM wear limit.
I guess it's rebuild time.
Hope that at least 4 of the pistons are reusable.
Then I can get away with one used piston, new cylinder sleeves and piston rings, bearings, gaskets, timing chain and valve guides.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.