I removed the injectors to see if it was hydro-locked. It was. I put an old beach towel over the holes and a geyser of water threw the towel into the inside of the hood with only a slight pull of the knob. Looking into the pre-chambers I saw this:



Closeups of the injectors:









I'm removing the glow plugs now, they're carbonized but they don't look like injectors. I've never seen anything like this before!

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1965 190D
1980 240D