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  #1  
Old 02-17-2010, 03:17 PM
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1985 300D vacuum crazyness.

Hey everyone, I just got a 1985 300D, I believe it's federal and not California because it has a federal emissions tag that doesn't mention CA in the drivers door.

Anyways, I used to have a 1983 300D so I'm fairly competent with vacuum on that car, but this 1985 is a whole different beast. It only fairly resembles the 1983.

So I just got this car and the car drives wonderfully but the vacuum is a mess. Looking at the schematics posted on this forum and looking at other photos on this forum, my vacuum is all wrong. The problem is, the 1985 has very few resources on this forum comparatively. And the photos and diagrams are horrible quality, my eyes just can't decipher so many details.

I am uploading one photo from my car with 4 easy to see problems, but honestly I think the whole thing is hooked up wrong. I'm also linking to a Picasa Web Album with a few high res photos for people to look at.

http://picasaweb.google.com/applyresistance/Car?authkey=Gv1sRgCOPD2fr6073k2AE&feat=directlink

Okay, in the attached photo, I circled four problems. In green is a line going nowhere but coming from the bottom of the blue saucer. I believe it should hook up to a "switchover valve, vacuum transducer" according to the diagrams. Problem is, I don't know what the "switchover valve, vacuum transducer" is. My only guess is that it is behind the brake booster closer to the driver's side.

In blue, I believe is the vacuum control valve, but with nothing hooked up to the top. The diagram shows that a green damper should be hooked up and then that to something else, not sure about though.

In red, is a green damper which is just looped around. This should probably go to the vacuum control valve, but then there is an open spot on that four way connector.

In yellow is a green line that is not hooked up to anything. On my old car that was the a/c vents. Is that still true? Where should that hook up? To the same four way connector as the doors right? I believe my four way connector for the doors has the line that goes to the tranny, which doesn't seem right to me.

Ok, any help would be appreciated. I would most appreciate is someone with a 1985 car could take high res photos of everything in their car which is correct and share with me.

Thanks!

David

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1985 300D vacuum crazyness.-img_1690-2-.jpg  
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  #2  
Old 02-17-2010, 03:37 PM
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I have an '85 300TD, But Its a euro car, so has even less resemblence to yours or my earlier 300's I'm currently trying to figure out the vac system to the trans--It appears the vac-microswitch normally found on cam-box is Inside the car somewhere near accelerator pedal...

So many differences with the '85 age and so many differences to territory too...

In your pics, is that white item with no pipe on the back of the IP the Vac. Stop device...?
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Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....
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Old 02-17-2010, 03:39 PM
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Quote:
Originally Posted by Alastair View Post
In your pics, is that white item with no pipe on the back of the IP the Vac. Stop device...?
I believe it's the vacuum control valve. Not sure how to hook it up though.

David
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Old 02-17-2010, 03:57 PM
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Oh crap. Things are worse than I thought. On the vacuum line to the brake booster, there are supposed to be two nipples and mine only has one. The other was cut off and filled. What the hell is wrong with people?

Surprisingly, this car had the vacuum in better shape than any of the other 300d's I've seen on this island.

David
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Old 02-17-2010, 04:01 PM
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Quote:
Originally Posted by davidd View Post
Oh crap. Things are worse than I thought. On the vacuum line to the brake booster, there are supposed to be two nipples and mine only has one. The other was cut off and filled. What the hell is wrong with people?

Surprisingly, this car had the vacuum in better shape than any of the other 300d's I've seen on this island.

David
Oh dear....

Its bad enough trying to figure out a genuine fault with these things, Let alone a Man-made fault!

--Wish I could help....
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http://i190.photobucket.com/albums/z...0TDnoplate.jpg

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....
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  #6  
Old 02-17-2010, 04:43 PM
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You'll need to replace that vacuum line to the booster. After that, you can re-plumb all the vacuum lines to the factory setting shown in this diagram.




Or if you choose you can eliminate the emissions portion of the vacuum lines shown this diagram I marked in the red Xs to make a cleaner engine compartment. Leave the transmission stuff there to keep the factory shifting properties.






.
Attached Thumbnails
1985 300D vacuum crazyness.-1985_617_vacuumdiagram_fed_cal_sfygsdy.jpg   1985 300D vacuum crazyness.-1985_617_vacuumdiagram_fed_calelimi_aurefgy.jpg  
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Last edited by whunter; 07-13-2011 at 01:48 PM.
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  #7  
Old 02-17-2010, 04:52 PM
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Follow post #6. Print that out and take it out to the car with you. Deleting the ARV and EGR controls will greatly simplify it.

When I picked up my car, I had the same nightmare under the hood. Once you get out there and start chasing lines... It is pretty simple (you will be surprised how simple).

The line from the top off center of the saucer with the green dash pot goes down to the trans. and the other goes to the vacuum source (if I remember correctly). On the bottom of the saucer... The center line goes to the ALDA and the one off center goes to a switchover valve. I'll see if I can find a pic and post it up here for you. Or PM me and I will e-mail you a VERY high res. photo.

Also, be sure that the lines coming off the "main vacuum line" are coming of and going to the right places before and after that check valve in the main line.

EDIT:
Here is a pic before I removed the EGR and ARV controls:

http://i247.photobucket.com/albums/gg133/litespeed58/Drversside.jpg

I can put up a newer pic after I deleted the EGR/ARV if you need it. But, the engine bay is not as clean anymore.
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Last edited by snookwhaler; 02-17-2010 at 05:05 PM.
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  #8  
Old 02-17-2010, 05:27 PM
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Quote:
Originally Posted by snookwhaler View Post
EDIT:
Here is a pic before I removed the EGR and ARV controls:

http://i247.photobucket.com/albums/gg133/litespeed58/Drversside.jpg
Every time I see the pic of this engine bay, I get that 'special' kind of excited...
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'85 300TD "Puff The Magic Wagon" - Rolling Resto
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Old 02-17-2010, 05:51 PM
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Snook's 85 makes me jealous

I can take a picture of my 85's vacuum system set up for you if you need me too. It's all original (including the emissions).

See if you can figure out what was disconnected.

Do your door locks and HVAC system work? I'm guessing that the PO may have deleted it from the engine bay because of leaks. If you repaired those leaks the proper amount of vacuum would be applied to your transmission and it will begin to shift properly.
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Old 02-17-2010, 08:07 PM
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Make sure any line you replace is done with vacuum hose not standard hose.
Vacuum hoses normally are much thicker walled to avoid collapsing from the vacuum.

The plugged booster line you should be able to drill out.
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  #11  
Old 02-18-2010, 12:06 AM
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Thanks everyone for the responses. Any and all photos and videos would be appreciated. I'm pretty excited about fixing this stuff now that I will have all these resources.

Snookwhaler, can you explain "Also, be sure that the lines coming off the "main vacuum line" are coming of and going to the right places before and after that check valve in the main line." I'm not sure I follow what you mean here. Could you explain more? Which check valve in which main line? Is the main line the line to the brake booster or something else?

Okayyoureabeast, the AC was removed, but not the door locks, and I don't think it was removed because of a leak, but just because the person thought it was unnecessary or something like that.

Thanks thanks thanks, I love being a diesel person, the help that we all give to each other is awesome.

David
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Old 02-18-2010, 12:16 AM
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What does everyone know about this little vacuum filter?
"Hens tooth" 1985 300D vacuum filter dark black

My car doesn't have one for sure. Where would it go?

Thanks,
David
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  #13  
Old 02-18-2010, 12:49 AM
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So I start to get confused when looking at the diagram because everything is plumbed differently that in people's photos. Specifically, snookwhaler's photo shows things way different than the diagram. For instance, the lines that come from the tops of 81 and 84 respectively should in the diagram go to different nipples of the check valve (140). On snookwhaler's photo it show both of those lines going to the same nipple of the check valve. Does anyone understand why this would be?

David
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Old 02-18-2010, 01:55 AM
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The vacuum filter will be on the vent line #85 on the diagram.


I believe snookwhaler's vacuum lines are setup incorrectly.




It should look like this....



close up...



A) Vent lines from the pressure converter.
B) White/blue vacuum line from switch over valve #81
C) White/Brown line to the pressure converter #84



.
Attached Thumbnails
1985 300D vacuum crazyness.-drversside.jpg   1985 300D vacuum crazyness.-85-vacuum-original.jpg  
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Last edited by DeliveryValve; 02-18-2010 at 08:58 PM.
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  #15  
Old 02-18-2010, 11:17 AM
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Quote:
Originally Posted by davidd View Post
What does everyone know about this little vacuum filter?
"Hens tooth" 1985 300D vacuum filter dark black

My car doesn't have one for sure. Where would it go?

Thanks,
David
See post #3 in that link. Folks will add that as a pre-warning of vacuum pump failure.

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