I have searched the forum for 'Car wont shutoff' (and other similar search terms) threads.

My '83 300SD wont shut down when I turn off the ignition. I have tried the 'lock myself in the car' then try to shut down. It didn't. I've looked over the all of the vacuum lines and they appear to be snug. So I think I may have a bad shutoff valve.

My problem is . . . where is this valve located and how do I recognize it when I see it?

Any help would be appreciated.

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Big Fred

(RIP Sept '10) 83 300SD Turbo Diesel (aka "Rocky")
(RIP April '10 - Accident) 86 Chevy M1009 CUCV (Blazer) - 6.2L Diesel (aka "Ogre")

It is on the Injection Pump.

connect good vacuum source to the lowest rubber line under that plastic saucer on the rear end of th IP.

If this does not work it may be a bad shut off valve

this is common and covered extensively - Having a mightvac helps diagnose leaks you would never imagine are present, visible inspection does very little

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http://www.pauldrayton.com/uploadfiles/merc/Service/W126/Index/617index.html

doesn't seem to be working (link)

same engine, basically (below)

www.pauldrayton.com\uploadfiles\merc\Service\W123\Index\617Tindex.html

http://www.peachparts.com/shopforum/showthread.php?t=88023

(this, and many others are found under "DIY links" at the top of the page)

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check out dieselgiant

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1982 300CD Petrol/Black Leather

Also in the SD, your locks are on a separate electric pump in the trunk, so bad locking system will not effect the shutdown of your car.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

does it shut down with the lever at least?

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83 300SD Dark Silver Dark brown inside

http://www.peachparts.com/shopforum/showthread.php?t=126051&highlight=shutoff

Thats how to replace it. Excellent mini pictorial.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

Yes, thankfully!

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Big Fred

(RIP Sept '10) 83 300SD Turbo Diesel (aka "Rocky")
(RIP April '10 - Accident) 86 Chevy M1009 CUCV (Blazer) - 6.2L Diesel (aka "Ogre")

Simple test not requiring a mity vac: Remove vacuum line from shut off valve. Put a 3' piece of vacuum hose in its place. With engine running, suck on vacuum hose with three long hard sucks. If the engine shuts off, the shut off valve is ok and the vacuum problem is elsewhere. If you get a mouthful of engine oil and engine fails to turn off, shut off diaphragm has failed and needs to be replaced.
If the former, run vacuum line out of engine compartment at cowl and shut hood. You can now shut off your engine without having to open the hood by simply sucking on the line. This is either a temporary or permanent solution dependent on your 'redneck' factor index.

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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

It's basically an easy repair .... after you've done it. Prior to that, it seems daunting.

You can go to AutoZone, they'll let you use a vac pump for free; I used it right there in their parking lot. Take off a hose from the SOV (shut off valve), pump the vac on it to see if the lever goes down and stays down. I think it should stay down for about 6 seconds before slowly coming back up. If the SOV is messed up, it might only go down for a second or two, then come back up.

Replace the SOV, but do take not of the extreme physical dangers of a runaway diesel. Once you replace the valve, you need to be prepared to starve the engine of air, just in case you installed the valve wrong.

Also, take note when you take the old one out, do it slowly so you can see how the new one goes in.

Good luck,

Jeff 1991 300d, 118k