There should be a fuel shot off there somewhere... Choking it like that can't be good for the engine. I had a Deutz that you needed to throttle rite back and it shut down that way, could yours do that too?
I have seen emergency shut down on the air inlet on engines but there was always another way of killing the engine , either by linkage or an electrical fuel shut off either internal or external , I think I remember old time mechanics I worked wth saying something like killing the motor with the emergency kill was " sucking the guts out it" , hows about it Old Machinist is that a good olde saying
That's a good old saying and likely true. Choking it to shut down is like running with a plugged air cleaner if it can't draw in air from the intake the vacuum in the cylinders will try to suck it out of the crankcase past the rings and valve seals. When you do this on a gasoline engine you'll see blue smoke the next time it's started because of the oil it sucked into the cylinders.
Thanks for the replies. I double checked, and it definitely is a choke to shut down. There is a fitting with a butterfly where the air cleaner pipe connects to the intake manifold. I always idle way back before shut down, and it stops immediately. This appears to be the "factory" setup, and I don't see anything obvious on the injection pump where a shutdown cable should be connected. I'm pretty sure my friends JD 1070 with a Yanmar 3 cyl has the same setup. I am sure that machine is factory original. Should I add a fuel solenoid? What happens if I am forgetfull and try to start against a closed fuel solenoid? I guess I would need to put in a regular keyed ignition switch, or a relay to not allow glowplug/starter unless fuel is on.
Adding a fuel shut dolenoid to the fuel line won't work, it will shut down sure, but then you will need to re-prime it when you want to start it again.
If its designed that way I'd just leave it. Its how old now and still running fine. There is a big difference between choking it to stop the engine from a idle and working a engine with restricted air. In a diesel engine the air flow helps cool the combustion process, a lack of air with the same fuel metering makes the exhaust temps run hot and extra heat is not what you want.
