You make a good point. I'd imagine some other folks might not be too familiar with how old IDI diesels work. If they aren't broke, they literally keep running until you run out of diesel, or stop giving the fuel stop solenoid +12v!
I've had at least 5 80s VW diesels, all of which use a nearly...
Just read the whole thread, and wish I could be of more help, but let me throw my thoughts on the pile!
If it's at all helpful, my 1992 HDJ81 has a decent shimmy / kerthunk every time I shut it off. Also, I can hear something (Exhaust?) bang against something else when it does that (hollow...