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  #1  
Old 11-23-2007, 09:58 PM
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What part do you block to prevent runaway diesel? W124

I replaced my Shut Off Valve (finally). I've been told to prepare ahead of time for a runaway diesel, and have someone else start the car. There've been terms and abbreviations used that I don't know what they are. (I'm lower than a low level mechanic, but I get the job done...eventually).

One person said to take off the flex tube that goes into the turbo and be prepared to block it with a spray paint can lid. Another person said no way, there are air leaks further up the food chain, so the car could still pull in air.

Some of you said to take off the turbo cross over tube. Seems to me there are 2 parts past the turbo. One is a short 5" hard tube, then the curved thing that goes up and over the engine. I'm assuming that's the cross over tube? How hard is that to take off?
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Old 11-23-2007, 10:02 PM
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I'd just be prepared to cover the turbo inlet. I've never replaced the shut off valve on anything other than a 617 but on that you can feel whether the rod is engaging the right part in the IP. Were you able to do that?
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Old 11-23-2007, 11:03 PM
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turbo inlet

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Originally Posted by kerry View Post
I'd just be prepared to cover the turbo inlet. I've never replaced the shut off valve on anything other than a 617 but on that you can feel whether the rod is engaging the right part in the IP. Were you able to do that?
When you say turbo inlet, you mean take off the flex hose leading up to it, correct?

On my car, you can see where the Shut Off Valve is supposed to go, but the area is tight, and it's hard to see once you put the valve in, if you actually STILL have it in the right spot. Once it was in, I did a vac test on it to see if the stop lever would go down, and it did. But I read to be prepared, so I will be. Runaway diesels are to be feared.

Thanks,

Jeff
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Old 11-23-2007, 11:34 PM
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On other diesel engines if the inlet air cannot be blocked to shut down the engine the only thing left is to quickly cut (and I do mean cut the fuel hose) or clamp off the fuel hose between the fuel supply pump and the fuel injection pump. This will cause the fuel pressure going into the injection pump to drop but the engine will still want to run on the fuel that is left inside the fuel injection pump houseing for a short period.
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Old 11-24-2007, 12:10 AM
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The cross over is number three, take it off takes about a minute. That will give you a nice flat surface on the face of the intake to put a block a of wood against should you need to.

Read the FSM in regards to the shut off valve and make sure you did it correctly.
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Old 11-24-2007, 01:05 AM
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How do you take off the cross over tube?

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Originally Posted by Hatterasguy View Post
The cross over is number three, take it off takes about a minute. That will give you a nice flat surface on the face of the intake to put a block a of wood against should you need to.

Read the FSM in regards to the shut off valve and make sure you did it correctly.
Good to hear it only takes a minute. I'll have a look at it tomorrow, but any tricks to taking it off?

Thanks,

Jeff
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Old 11-24-2007, 02:31 AM
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I.P.Fuel shutoff

JBach,

If, when you apply vacuum to the shut off valve,the mechanical shut off lever
moves down(as to shut off the fuel supply) ...you've installed the new vacuum
shut off valve correctly.

How much difficulty did you have/ Did you end up removing the ALDA?
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Old 11-24-2007, 01:23 PM
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I did remove the %&#!$ alda

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Originally Posted by compress ignite View Post
JBach,

If, when you apply vacuum to the shut off valve,the mechanical shut off lever
moves down(as to shut off the fuel supply) ...you've installed the new vacuum
shut off valve correctly.

How much difficulty did you have/ Did you end up removing the ALDA?
Yes, I did remove the alda. It was a witch, or some other word that rhymes with that, to get out. I had to get a cresent wrench on the bottom nut, and a pair of channel locks on the square thing on top. The space was so tight, I had to shorten the channel locks with my Rotozip.

The weird thing was, due to the tight space, the square part did get turned 1/4 turn counter-clockwise. That gave me enough room to get the Shut Off Valve out, and do whatever else I needed to do. I thought all was well, but when I went to reassemble everything, turns out the lower nut was loose. So I hope I got that back on as tight as it is supposed to be.

Jeff
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Old 11-24-2007, 05:03 PM
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Quote:
Originally Posted by jbach36 View Post
Good to hear it only takes a minute. I'll have a look at it tomorrow, but any tricks to taking it off?

Thanks,

Jeff
Their should be three allen head bolts, two from the crossover to the manifold, and one on the other end, on kind of like a clamp. If it has never been off before it will take longer to free the bolts and gaskets, but it should come right off.
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