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  #1  
Old 08-22-2007, 12:02 PM
angst's Avatar
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wont turn off for anything

84 300sd almost nothing is getting it stopped. Stop lever doesnt get it done. Ive even tried disconnecting various rods to the stop lever and pulling them individually.
Im reading 12hg vacuum supplying the shut off valve at the back of the injector pump.
Ill even seal up the intake and push the stop lever all the way and enough air is still getting in through the pcv valve hole and nut on top of the air cleaner and it keeps on running.
I did mess with the vacuum lines to the ignintion switch last week when I gutted the steering lock, but I have been under there and jiggled those with no different results. Im out of ideas.
What is the minimum threshold for vacuum? All the testing step by steps say to check for vacuum presence at various places but how much is enough?
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84 300SD 274K
38K miles on flatplate heat exchanger and various diesel/veg blends. prior to that 4K miles on unheated veggie blends with kero and DinoD.
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  #2  
Old 08-22-2007, 01:27 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
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Disconnect the primary filter and fuel starve it. You'll have to prime like crazy but at least it will be stopped.
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70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

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  #3  
Old 08-22-2007, 02:46 PM
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Guaranteed!

It is guaranteed to stop if you shut off the air. If your aircleaner is properly installed and all the hoses on properly and clamped you should be able to stop it very effectively with your hand over the front of the air intake. If you can't do it with your hand, add a cloth or a plastic bag like a freezer/refrigerator bad, or a small shopping bag. If your lever will not stop it, the length of the lever is not set right. That is what the Benz people put that lever there for. Adjust it. Without air or without fuel it can not run, period.
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1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

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  #4  
Old 08-22-2007, 04:19 PM
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if all else fails to shut down a motor, dumping a full shot of CO2 fire extinguisher will stop it. DO NOT USE OTHER STYLES OF FIRE EXTINGUISHER!!! well, except for halon... although, if you have one of those, sell it, it's worth a fortune!
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  #5  
Old 08-22-2007, 04:22 PM
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Put a vice grips on the fuel line. Once the fuel line is pinched it can't suck any more fuel and will shut off.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
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  #6  
Old 08-22-2007, 09:15 PM
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Please take a look at the pic and tell me if Im diagnosing this right. I put a mightyvac on where hose to the stop valve is. I can not pump up to a vacuum. Shouldn't it die as soon as vacuum is applied to that hose? If it is not dieing with vacuum going to that point is the problem inside that valve itself?


PS. The vice grips sounds viable. Sounds better than disconnecting the filter. I was getting a good seal on the front of the intake. I used a rubber kayak bootie. There is just too much air still coming through where the pcv hose goes into the air filter housing.

Nothing has changed with the length of the levers. I even disconnected different ones and tried pulling them individually to try to get it to go off.

When I do get it to turn off it is immediatley after I rev it real high by hand on the stop lever.

Idle speed goes up after I turn the ignition key off. Is that wierd or to be expected?
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wont turn off for anything-shutvalve.jpg  
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  #7  
Old 08-22-2007, 09:43 PM
kbenjamin0106's Avatar
83 & 85 300d's Turbo's
 
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can this be a possible runaway, from i read from in the past?
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  #8  
Old 08-23-2007, 02:07 PM
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the engine doesn't start screaming. Idle just goes up a bit when I turn the ignition key off.
Anyone know the answer? If vacuum is applied directly to the valve and the car does not turn off does this indicate that the valve itself is bad?
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84 300SD 274K
38K miles on flatplate heat exchanger and various diesel/veg blends. prior to that 4K miles on unheated veggie blends with kero and DinoD.
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  #9  
Old 08-23-2007, 02:59 PM
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I can't tell from your picture if that line actually goes to the shut off valve. If it does, you should be able to pull a vacuum on that line and hold it. It should also shut off when a vacuum is pulled on it. Looks like the shut off diaphragm is bad.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #10  
Old 08-23-2007, 03:07 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
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Quote:
Originally Posted by angst View Post
If vacuum is applied directly to the valve and the car does not turn off does this indicate that the valve itself is bad?
Yes. The brown colored lines are the ones for the shut off valve.
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RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
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  #11  
Old 08-23-2007, 04:20 PM
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Just unscrew the idle adjusting screw until the stop switch works.

Easier than spending $25 bucks on a fire extingusher.
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  #12  
Old 08-23-2007, 04:29 PM
vstech's Avatar
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where can you find CO2 fire extinguishers for 25.00???? they are more like 150.00
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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