86 300SDL Engine Won't Shut Off

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eddie - 14 Jul 2006 03:54 GMT

I recently stored my car for several months and prior to this I added a
fuel preservative to the tank. I now must operate the emergency switch
to shut off the engine. Will this problem correct itself after the fuel
additive is out of the system or do I have a problem that requires
servicing? I have read somewhat about this problem and wonder whether I
may have a vacuum problem with the shut off valve. If so where is the
valve located and is it easy to check? Door locks operate OK. What
might be a ballmark cost for the dealer to repair?

Thanks

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Richard Sexton - 14 Jul 2006 04:26 GMT

>I recently stored my car for several months and prior to this I added a
>fuel preservative to the tank. I now must operate the emergency switch
[quoted text clipped - 4 lines]
>valve located and is it easy to check? Door locks operate OK. What
>might be a ballmark cost for the dealer to repair?

There's a muchroom shaped do-hicky on the back of the injection
pump. When it fails (and they all do) this is what happens.

Just get a new part and replace it yourself. It's disgustly easy
albeit a bit fiddly getting it back on.

The only thing to watch out for is oil in the vacuum line going to
it, it usually indicated vacuum pump failure which is what sometimes
causes this part to fail. There is a rare catostrophc failure tha
too much oil can cause the engine to be near impossible to shut off
as it eats it's own oil DO NOT UNDER ANY CIRCUMSTANCES put your hand
over the air intake. If you want to keep the hand and your life that
is.

Hopefully you have no oil in that line. If you do we need to talk.

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Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net

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eddie - 14 Jul 2006 12:24 GMT

Richard,

Thank your for your prompt response. Your statement that the part is "a
bit fiddly getting it back on" does concern me.

Eddie

> >I recently stored my car for several months and prior to this I added a
> >fuel preservative to the tank. I now must operate the emergency switch
[quoted text clipped - 26 lines]
> 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
> 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net

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Richard Sexton - 14 Jul 2006 17:14 GMT

>Richard,
>
>Thank your for your prompt response. Your statement that the part is "a
>bit fiddly getting it back on" does concern me.

The new part has a little hook that you have to hook over a lever inside the
injection pump that you can't quite see. That's really easy to do until
you relize you forgot to use the thin paper gasket it came with so you
take it off and try again and now it's tricky. It won't go on it the 5
seconds it took you last time, it may take 10 or 15 minutes to get
the stupid thing to hook on.

Persistance! It can and will be done and it seems silly to pay somebody an
hours labor for something that just requires a bit of determination.

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Karl - 14 Jul 2006 15:09 GMT

The shutoff diaphragm is on the back end of the 616 and 617 diesels.
He has a 86 SDL, therefore he has a 606 diesel.
The shut off is on TOP of the injection pump, under the intake.
For a 1st-timer, you should remove the intake to replace it....

> >I recently stored my car for several months and prior to this I added a
> >fuel preservative to the tank. I now must operate the emergency switch
[quoted text clipped - 20 lines]
>
> Hopefully you have no oil in that line. If you do we need to talk.

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Richard Sexton - 14 Jul 2006 17:15 GMT

>The shutoff diaphragm is on the back end of the 616 and 617 diesels.
>He has a 86 SDL, therefore he has a 606 diesel.
>The shut off is on TOP of the injection pump, under the intake.
>For a 1st-timer, you should remove the intake to replace it....

It is? (rolls eyes) Now I know why I like the 5 cyl diesels.

Sorry abuot that.

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eddie - 16 Jul 2006 14:07 GMT

Thank you everyone for your assistance. The problem turned out to be a
vacuum line had come off of the "shut off diaphram"? I looked around
the area where the manual emergency stop level was a saw a "clean"
brass nozzle fitting and then located an unnconnected hose and
reattached it to the fitting. Works fine now.

Thanks Everyone

> >The shutoff diaphragm is on the back end of the 616 and 617 diesels.
> >He has a 86 SDL, therefore he has a 606 diesel.
[quoted text clipped - 10 lines]
> 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
> 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net

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