Car is 85 300d turbo with 260k with new timing chain, injectors and filters including tank screen. Blows blue smoke.

Absent the equipment to do a leak down test, would this be the next best thing to see if the compression problem is valves or pistons or rings?

My numbers dry and wet are:

360, 420
260, 300
220, 220
100, 120
260, 320

Doing a compression check without the rockers won't tell you anything. You already know what you really need to check -- leakdown.

have you inspected the cam lobes on that cylinder yet?
John

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1987 190D 2.5Turbo
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Compression test should be done only after valves are adjusted when the engine is cold. Valves should be within specs, then you do a compression test. If Rockers are off how do you have the right spec/valve clearances between the lobe and the rocker arms?

Regards Tom

You can't even do a compression test without the rockers.

No rockers means the valves can't open. If the valves can't open, the engine can't suck in any air to compress.