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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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Thanks
![]() ![]() ![]() ![]() Last edited by Tangent; 10-10-2004 at 02:52 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. ![]() 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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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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85 300CD 83 300TD 78 240D (daughter) Last edited by phantoms; 11-23-2004 at 08:25 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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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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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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1983 300SD 200000miles |
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Thanks
Thank you that was helpfull.
Dave S |
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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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Jeff M. Mercedes W123 DIY pages are now located here. 1983 / 1984 300D Sold 2000 CLK430 Cabriolet ~58k Sold 2005 Avalanche 4x4 ~66k |
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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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ASE Master Mechanic https://whunter.carrd.co/ Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 2003 Volvo V70 https://www.boldegoist.com/ Last edited by whunter; 10-20-2006 at 11:55 AM. |
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Quote:
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Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section |
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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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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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----------------- 1980 300D 300K KM - parting out 1979 300D 375K KM - parting out 2 300Ds for sale |
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1987 300D and 300SDL Vacuum Diagrams pdf style
Quote:
pdfs print better IMHO
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
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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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85 300CD 83 300TD 78 240D (daughter) |
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