Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-13-2008, 05:05 PM
Registered User
 
Join Date: Jan 2008
Posts: 3
Engine shut off

My '82 300TD will not shut off when the ignition is switched off. It started doing this sporadically, but has since begun to not shut off more and more. The service manual shows a vacuum fuel shut off diaphram, but I can't figure how it is activated. Any help would be appreciated.
Reply With Quote
  #2  
Old 04-13-2008, 06:06 PM
Registered User
 
Join Date: Jun 2007
Location: new braunfels, TX
Posts: 290
It is activated by a switch on your ignition switch. There are two vacuum lines on the switch. One is vacuum supply from the pump, the other when engaged sends vacuum to the shut off valve, actuating it to shut of the engine.
__________________
Dave
1983 300D Daily Driver







Reply With Quote
  #3  
Old 04-13-2008, 07:24 PM
300SDog's Avatar
gimme a low-tech 240D
 
Join Date: Jan 2003
Location: central ky
Posts: 3,602
Couple of diagnostic tips before you attack the valve:

Try shuttin the engine off *after* central locking the doors with you still in the car. If shutoff works with doors locked then the problem aint the valve.

Try disconnecting and golf tee plugging vacuum feed to the horrible ACC system at the firewall driver's side. Again if the car shutdown comes back to life then yer problem aint the valve.

Finally inspect and jam tight all rubber elbows and joints throughout the vacuum system including the EGR and triple tree on top of the valve cover before condemning the valve.
Reply With Quote
  #4  
Old 04-13-2008, 07:58 PM
Registered User
 
Join Date: Feb 2007
Location: SD California
Posts: 153
I have the same problem with my 82 300D turbo which I bought a couple of days back, Swapped the vacuum valve & checked the vacuum lines so far the problem still persist, central locks don't work at all,will check the horrible a/c vacuum lines next.


97 C230 OZ Racing wheels, Sport pkg interior
94 C280 Brabus Monoblock 6, Bose Pkg (For sale)
82 300D Turbo ( my first W123 & 4th Dsl)
Reply With Quote
  #5  
Old 04-13-2008, 08:10 PM
Registered User
 
Join Date: Sep 2003
Location: Central, NJ
Posts: 246
Check the vacuum connections in and around the oil filter casing. They often get broken while removing the cover. You'll need to look close because it could be just a hairline crack.
__________________
Toblin

'79 300D, "Liesel von Diesel", 235K

I kid proofed the house....but they still get in
Reply With Quote
  #6  
Old 04-13-2008, 08:44 PM
Registered User
 
Join Date: Jan 2002
Posts: 18,355
Simple test of the shut off valve is to replace the brown vacuum line going to it at the back of the IP between the IP and oil filter housing with a section of vacuum hose. Suck on the hose with the engine running. If the diaphragm is good, you should be able to shut it down with a couple of sucks. If it is torn, be prepared to quit sucking when the oil hits your lips.
__________________
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
Reply With Quote
  #7  
Old 04-13-2008, 08:49 PM
92 300D 2.5L OBK #59
 
Join Date: Feb 2007
Location: Central FL
Posts: 1,108
Quote:
Originally Posted by kerry View Post
Simple test of the shut off valve is to replace the brown vacuum line going to it at the back of the IP between the IP and oil filter housing with a section of vacuum hose. Suck on the hose with the engine running. If the diaphragm is good, you should be able to shut it down with a couple of sucks. If it is torn, be prepared to quit sucking when the oil hits your lips.
If possible use a syringe. You won't have to suck.
__________________
92 300D 2.5L OM602 OBK #59
Reply With Quote
  #8  
Old 04-13-2008, 11:01 PM
Registered User
 
Join Date: Jun 2006
Location: Southeast
Posts: 1,594
It's a simple repair, but ...

Beware of a runaway diesel engine after you repair it. Be prepared to starve the engine of any air if it becomes a runaway (just red lines on the rpm and blows up and can kill you). Email me if this is not clear.

jeff
Reply With Quote
  #9  
Old 04-13-2008, 11:33 PM
Bob Albrecht's Avatar
Registered User
 
Join Date: Mar 2005
Location: Kennett Square, PA
Posts: 344
Check the vacuum line to the injection pump

Your exact symptoms happened to me. There is a vacuum line that connects to the injection pump, but you know that.

On my car I accidentally loosened the line while replacing the fuel line. It was just touching the connection on the pump and sometimes it would suck on the connector and stop the engine, and sometimes it wouldn't. I finally figured it out and just pushed the vacuum line back on and it hasn't happened since. I hope it is that simple for you.
__________________
1991 350SD (updated rods)
Biodiesel B100 when I can find it.
Dino when really cold outside
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 06:38 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page