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Old 04-21-2013, 02:19 PM
cornemuse's Avatar
red herring
Join Date: Sep 2012
Location: Geographly, heaven. Politically, hell.
Posts: 1,326
Vacuum Woes 300CD

I have the 123 service man. cd's but cant figure out the vacuum system. The man says the vac lines from the door go DOWN, but after removing the side panel (behind hood release), I see they go UP. The cd manual is a practical joke! I know the leak (a fast leak!) is from the 'yellow only' line going into the inside of car. Where would the 1st connection/splice/manifold be?? up or down? It seems I will need to remove the inst panel, no problem there, I've done that before. Any suggestions/tips? On the svs cd, it shows on all diesel diagrams 2 connections at the vacuum pump. Mine has one that goes to vac brake booster (w/ 2 side connections).


I finally fixed the door (whatever you call the thing that holds the door open 'with detents'). The 300CD is a but the body seems to have little in common with the 240/300D's. I called MB dealer who would have to order it from Germany for $145.00 +. I went to the local Ecology auto wreckers who had a GUTTED '84 CD, the part I needed cost $6.00 +

I also removed the vac pump & line to brake booster for 10 bucks in case I might need them, but trouble-shooting determined the problen inside the car, well I have them now.


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Old 04-21-2013, 04:39 PM
Mölyapina's Avatar
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Join Date: Oct 2012
Location: Chelmsford, Massachusetts
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Don't know if you also want to put this up in "Diesel Discussion", since the car in question is a diesel...
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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Old 04-24-2013, 03:29 AM
pidgy999's Avatar
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Join Date: May 2008
Location: California
Posts: 8
Hi cornemuse, I also have a coupe, 1980. I'm curious how you fixed your door detents. One day closing my door I heard an unpleasant sound and the door wouldn't stay open anymore.
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Old 04-26-2013, 12:40 PM
cornemuse's Avatar
red herring
Join Date: Sep 2012
Location: Geographly, heaven. Politically, hell.
Posts: 1,326
pidgy999, take the door 'trim off (handle, chrome, etc.), open window, there are 3 10mm head mach screws, one on the side,& two under the 'rubber' door seal. there is a hole just aft of the unit & if you are like me with LARGE hands, youll probably end up with scabs on your hands! Oh yes, a small cir-clip & pin attaches the other end to the door jamb.


There is a 'barrel' with 2 large balls and springs pushing them apart. The plastic part gave away, the ball (one of 'em) came out, along with the springs, and its dead. Really not too bad a fix, tho. -c-

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