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  #1  
Old 05-14-2008, 04:33 PM
Jimmy Joe's Avatar
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Vacuum diagram (or helpful tips) for '80 300CD needed

if you know where to find one, please help!

This thing is a non-USA car, if that matters.

(btw, I have been through the sticky and DIY and numerous search threads...they either don't resemble mine and/or don't label all the numbered parts...)

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Last edited by Jimmy Joe; 05-14-2008 at 09:18 PM.
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  #2  
Old 05-14-2008, 09:17 PM
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i think i have searched everywhere to no avail.

if someone with a '80 could help me out with a description I would be most grateful.

All I really need is the routing from the main vacuum supply to the tranny modulator.
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  #3  
Old 05-14-2008, 09:35 PM
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I have an 80 300D in stock config. I could take a pic tomorrow.
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  #4  
Old 05-14-2008, 09:40 PM
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Well I have a 1980 300cd, and I've fixed all of it's vacuum issues through trial and error and mityvac. What problems are you having?
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  #5  
Old 05-15-2008, 12:56 AM
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rkohut, a pic would be most appreciated.

derburger, my problems are harsh shift, especially 1st to 2nd, and flaring - and a hack job done on the vacuum lines. I have a mityvac which tells me there is good vacuum supply, and the modulator holds vacuum.
But the 3/2 valve on the valve cover is disconnected, the egr is disconnected, the tranny modulator line is hooked direct to the vacuum supply, the attachment on th IP which I have read should be attached is not, and the green dashpot is nowhere to be found.

So, its been bubble-gummed together and I have no way to tell how it should be, as intended. A diagram, or pics, or any advice would really help.
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Old 05-15-2008, 12:50 PM
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still fishin, kinda dead in the water here...
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  #7  
Old 05-15-2008, 12:54 PM
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Pic of 1980 300D engine vacuum lines

And a much higher res shot
http://i177.photobucket.com/albums/w237/rkohut/1980300DVacLines.jpg

Also, you should have a 722.118 tranny. Have you seen this?
http://www.mercedesdismantlers.com/722.118_transmission_adjustments.htm
Attached Thumbnails
Vacuum diagram for '80 300CD needed-1980-300d-vac-lines.jpg  
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Old 05-15-2008, 01:07 PM
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Quote:
Originally Posted by Jimmy Joe View Post
still fishin, kinda dead in the water here...
Patience young man.
Since it's only around 10:00AM in Kali now I was takin my time.
Don't you guys sleep til noon out there?.........
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Old 05-15-2008, 01:22 PM
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Only if you`re retired and have no life and stay up all night with MB Shop .


Wish I could help you Jimmie with the Vac. when you get back we`ll fix your vac. with a 4-speed swap.

Charlie ☺
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  #10  
Old 05-15-2008, 02:59 PM
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Hey Charlie,
That would be a blast! What fun it would be to have a stick in one of these beasts...

Thanks Rkohut, it looks like I better hook up that valve on the valve cover.
It seems like the other line on the same "Y" as the tranny line goes to the vacuum source, but I cant see that, it shoots off the bottom of the pic.

Where does the other (solo, closest to the air filter) line on the 3/2 valve go , looks like to the thing on the top of the IP?

Do you also have one of those green inline dashpot dealies?

I better get to the local upull it and see if I can source some of those connectors and whatnot...
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Old 05-15-2008, 04:32 PM
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Quote:
Originally Posted by Jimmy Joe View Post
It seems like the other line on the same "Y" as the tranny line goes to the vacuum source, but I cant see that, it shoots off the bottom of the pic.
Where does the other (solo, closest to the air filter) line on the 3/2 valve go , looks like to the thing on the top of the IP?
Attached is an updated pic..... here's the high res version
http://i177.photobucket.com/albums/w237/rkohut/1980300DEngineVacuumLines.jpg

Quote:
Originally Posted by Jimmy Joe View Post
Do you also have one of those green inline dashpot dealies?
I better get to the local upull it and see if I can source some of those connectors and whatnot...
Ya.....local upull. You should be able to get vacuum parts from most MB diesels
Attached Thumbnails
Vacuum diagram for '80 300CD needed-1980-300d-engine-vacuum-lines.jpg  
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  #12  
Old 05-15-2008, 05:06 PM
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Thank you so much!
Now it all makes sense; I will get to the car this afternoon and see if I can plumb her correctly.

I really appreciate your help here
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  #13  
Old 05-16-2008, 01:04 AM
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Quote:
Originally Posted by rkohut View Post
Patience young man.
Since it's only around 10:00AM in Kali now I was takin my time.
Don't you guys sleep til noon out there?.........
Not if you are up all night worrying about vacuum!

Never let it be said that you are not the Man !! You are the Man!

Thanks heaps for puttin those pics up, super helpful. I have incorporated that valve cover switch back into the mix; and it looks right now. We shall see if it changes life for the better.

I see no sign of that green dashpot, so it's time to stop concerning about it. I figure there isn't much else to do except tinker with the modulator.
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  #14  
Old 05-16-2008, 08:15 AM
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You looked everywhere instead of up!

There's a STICKY labeled vacuum diagrams for 123 & 126 models.
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  #15  
Old 05-16-2008, 12:10 PM
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Quote:
Originally Posted by dannym View Post
You looked everywhere instead of up!

There's a STICKY labeled vacuum diagrams for 123 & 126 models.
Ha! That is the first place I looked!
Now it is your turn. Just take a gander at those diagrams. The one which might correspond to my car has absolutely minimal information and is clearly not my application- for example, it shows a "vacuum control valve" (which does not exist on my car, the thing on the IP, which in my case has 2 vacuum lines, not the 4 they show). Not to mention its archaic undecipherable manner....

So, this is not my vacuum diagram. Given the fact that MBZ changed their configurations often, a generic "300 series" diagram is just not enough for most here I am guessing; and way too general a statement (just like a "check the archives" ploy

All kidding aside, and I bet many will agree with me, we should put together a list of diagrams, by year, for the most usefulness.

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