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.html#post883130

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
http://www.peachparts.com/shopforum/diesel-discussion/239586-om603-vacuum-eds-diagram.html


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

Thanks :D :D :D :D

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. :confused: 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.

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.

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)

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

Thanks, I'll use these for reference, but I have an 1980 300sd... the 116... will some of these apply to mine?

Thanks again,

Les

I vote for a sticky also, if it has not been done already

Found a 80 300SD diagram for you at http://www.peterschmid.com/vacuum/1980/617_950.jpg.

Thanks Phantoms!

Les

Thanks
 

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.

Thanks
 

Thank you that was helpfull.
Dave S

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/

Hmmm
 

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

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

Another engine wont shut off problem.
http://www.peachparts.com/shopforum/diesel-discussion/167360-another-engine-wont-shut-off-problem.html#post1302538

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,:eek: I can live with that. :D :cool: