Larry.
The best and fastest way to kill a diesel engine is to cut off it's air intake supply!
I changed a vacuum shutoff valve on my 300D and had a small piece of plywood to slam over the air intake on the air cleaner in case of a "run away".
Been there many times, I used to rebuild Detroit Diesel 2 cycle engines, 71's, 53's, 92's, as well as a lot of trouble shooting them, 100's of them, usually stuck injectors!
Takes to long to cut off the fuel!
Kill the air supply, and they will die fast.