I've added a 5th CRD to my fleet! Decided to buy a project again and try to get it going. Previous owner was a member here and posted about it in January. Here is a link to his thread:
viewtopic.php?t=83790Many guessed a glow plug. Some guessed it was a dropped valve. I took the head off and here is what I found:

As you can see, the valve snapped off and is embedded in the piston. Here is what the head looks like:

And of course, the cylinder liner could not escape without a couple scratches:

I have a spare engine. I can swap engines or repair this one. Have not decided which way to go yet. Can I pull the piston without removing the engine?