Here is the wording from DieselGiant:

If for some reason you get a run-a-way engine, this is the quickest way to stop it. A spray paint can top fits perfectly over the turbo inlet, to instantly cut the air supply and shut the engine. Just remember to remove the air boot from the turbo to the air cleaner, before you start the engine. If you have a non turbo car, just remove the air cleaner and get a piece of wood or cookie sheet that you can put over the intake manifold opening which also will stop the car instantly. Remember an engine needs three things to run, fuel, air and heat. Take away any one of them, and it won't run.

I looked on my W126 CD1 manual that I bought (two cds) and now see where the turbo charger is. To see it you must remove the air cleaner and bracket and it is below. Is DieselGiant wanting me to use the spray can top in there somehow? Need to go out and look at the engine. Maybe talking about the ribbed black plastic hose (must be called an air boot) that fits to the front of the air cleaner - that must be an air intake. Seems like it is a lot larger than a spray can top but I need to look. If that fits, would be simple to put the top over that hole to stop the engine. May test it just for kicks.

It may be that the control arm going from the manual kill lever to the side of the IP needs adjustment. I would disconnect the control rod and see if just manually pulling up on the rod solves your issue.

I've read in the past where this same rod was causing an idle problem, due to being slightly in cut-off, and a slight adjustment in length solved the problem. You may have a similar issue with an opposite symptom.

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )

Good idea. Will try.

Well, I believe you guys are right. I checked the shut off valve with my Mityvac and it will not hold a vac; in fact it will not even build up a vacuum. Just to be sure I also pulled off the 3 inch rubber hose which connects she shutoff valve to the tiny brown with blue stipe line and the 3 inch rubber hose held vac fine. So the shut off valve must have lost its seal.

Also found out that DieselGiant must be wrong. First the paint can top does not come close to fitting the air intake on the breather when you pull off the blacked ridged say 5" diameter hose. The spray can top is way too small. So I got a large plastic top from an old coffee can, started the diesel, and completely blocked off the air with the coffee can lid. No effect. Engine ran fine; did not even cough. So much for this tactic if I get a run away engine.

Gave me a chance to use the stop lever and it worked fine. Tried it three times and it worked fine each time.

So guess is time to buy a stop valve.

Bill Grissom - do you still have one? You can email me at tyl604@aol.com.