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  #1  
Old 10-08-2004, 10:01 PM
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Vacuum Diagrams

Here are some vacuum diagrams to help you diagnose your W123, W124 or W126 diesels. The 240D diagrams were looked up for a 83 year model, but should be pretty much the same for 82-85. I've also added some wiring and flow diagrams. Also note that there are year to year (and sometimes, throughout the year) changes and these diagrams may not reflect everything exactly as on your model.

'86-'87 300 SDL, '87 300D vacuum diagram


Cruise Control Repair Articles
http://www.peachparts.com/shopforum/diesel-discussion/123036-cruise-control-repair-articles-post883130.html

Diesel Vacuum system adjustments
http://www.mercedesdismantlers.com/diesel_vacuum_system

722.3 and 722.416 transmission adjustments
http://www.mercedesdismantlers.com//722.3and722.416_transmission_adjustments.html

722.118 Transmission Adjustments
http://www.mercedesdismantlers.com//722.118_transmission_adjustments.html

Diagrams for W124.128 with OM602.962.
http://www.peachparts.com/shopforum/groups/w124-300d-2-5-turbo-pictures.html

OM603 Vacuum & EDS Diagram
OM603 Vacuum & EDS Diagram


Edit:http://www.peterschmidtransmission.com/vacuum.htm also has a good deal of vacuum diagrams available.
http://peterschmidtransmission.com/mb_files/vacuum_schematics.asp
Vacuum Control Valve Test:
http://peterschmidtransmission.com/mb_files/vacuum_test.asp


1985 Mercedes Benz 300SD ACC Vacuum Diagram
http://autorepair.about.com/library/images/bl929lib.htm

(W123) Fixed vacuum leak, now tranny flares
http://www.mbca.org/forum/fixed-vacuum-leak-now-tranny-flares

Last edited by whunter; 09-24-2012 at 10:41 AM. Reason: dead links
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  #2  
Old 10-09-2004, 05:31 AM
Tangent
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Thumbs up

Thanks

Last edited by Tangent; 10-10-2004 at 02:52 AM.
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  #3  
Old 10-09-2004, 08:01 AM
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In reviewing the diagrams for the '85, it is apparent that this vehicle has a vacuum system that differs significantly from the '84 300SD. The changeover valve on the valve cover is controlling the transmission modulation again, something that the '84 does not have.

There is also a "cam plate" with a "valve" attached in the aforementioned diagrams. The '84 does not have this arrangement.

Just a word of caution. The vacuum systems did change frequently throughout the years. The '85 probably has the most changes of them all.
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  #4  
Old 11-08-2004, 07:14 PM
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Edited to add 82 300D vacuum diagram and a few other things.

Edited to add a couple more diagrams and a link to Installing the Fast Start Glowplug kit (changing over from loop-style to pencil-style glowplugs).

Edited to add a couple more items including the injector parts breakdown.
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Last edited by phantoms; 11-23-2004 at 08:25 PM.
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  #5  
Old 12-13-2004, 08:36 PM
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Excellent information here. I've been dissecting my 240 and 300 for about a year now and going through all the long forgotten maintenance items that were neglected before I acquired the girls. Tho I kept them on the road, my weekends and these winters allow lots of time to bond and restore to a couple of nice looking and driving cars.

82 240d Suzy(wifes)
82 300dt Lizzy(Help my daughter is starting to like her)
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  #6  
Old 12-22-2004, 09:21 AM
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Phantoms,

This is great info and should be put in the DIY sticky for future reference. Thanks for taking the time to do this.

Tom
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  #7  
Old 12-29-2004, 11:53 AM
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I just had a chance to look over the diagrams you posted. Amazing info. I have had my 83 300SD for about a month now and in looking for info on it I find this site and the people extremly helpful. I thank you all.
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  #8  
Old 01-09-2005, 01:30 AM
mattdave
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Thanks

Thank you that was helpfull.
Dave S
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  #9  
Old 01-31-2005, 09:53 AM
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In hopes of having all this stuff on one site I merged most of this into the vacuum section of our DIY pages, there is another page for the fuel related stuff. http://207.210.95.34/~boostd/Vacuum/
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  #10  
Old 02-04-2005, 11:53 PM
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Talking Hmmm

If I had a plotter, these would be my new wall covering. LOL

EDIT:
Vacuum Devices, '85 300D-T
http://www.peachparts.com/shopforum/diesel-discussion/166098-vacuum-devices-85-300d-t-post1291383.html

Another engine wont shut off problem.
http://www.peachparts.com/shopforum/diesel-discussion/167360-another-engine-wont-shut-off-problem-post1302538.html
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Last edited by whunter; 10-20-2006 at 11:55 AM.
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  #11  
Old 02-05-2005, 11:30 AM
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Quote:
Originally Posted by whunter
If I had a plotter, these would be my new wall covering. LOL
I believe Kinkos has plotters that you can use, I shall take a look next time I am there. Hum, a room covered in car porno, I can live with that.
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  #12  
Old 09-08-2005, 12:02 PM
al in wash
 
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Angry vacuum diagrams for 87 124td

does anyone have vacuum diagram for 124? I swapped in a good used engine recently and now the turbo wont kick in and the tranny shifting is screwed up....does this car have an ALDA...has anyone installed an adjustable boost controller?
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  #13  
Old 03-31-2006, 03:36 PM
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300D diagram

Here's a link to a few more that I didn't see on the list:

http://www.peterschmid.com/vacuum.htm

1968-1979, 1980, 1981, 1977 - 1985
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  #14  
Old 06-22-2009, 02:29 PM
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1987 300D and 300SDL Vacuum Diagrams pdf style

Quote:
Originally Posted by falc2005 View Post
does anyone have vacuum diagram for 124? I swapped in a good used engine recently and now the turbo wont kick in and the tranny shifting is screwed up....does this car have an ALDA...has anyone installed an adjustable boost controller?
I "blew up" the FSM diagrams so I could read them better and scanned them.
pdfs print better IMHO
Attached Files
File Type: pdf 87 W124 vacuum parts, defined.pdf (45.7 KB, 924 views)
File Type: pdf 87 W124 Vac Routing diagram1.pdf (43.1 KB, 1137 views)
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  #15  
Old 04-27-2006, 09:27 PM
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Took some pictures to replace the lost pictures for the glowkit installation page (http://home.comcast.net/~phantoms/vacuum/index.htm) while I had my daughters car in my shop this week.
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