Knocked off several vacuum hoses!
 

In the process of doing the gaskets on my oil filter stand (man what a job that was), I accidentily disconnected several vaccum lines. I can't figure out where they go so what do I do? BTW I now know you can't shut down a 300D with said hoses off.
HELP

You can push the manual stop lever. ;)



Can you provide a picture to us of what ya knocked off?

Right at the firewall where the power brake assist is located, there are a number of different color tubes that have become disconected. Also a black poly tube about a foot long seems to have completely pulled out from where it was attached in or through the firewall. Another thin tube also pulled through. It is also about a foot long. BTW where is the manual cut off switch?

I can go snap a pic of mine for you if that'll help? I have removed all the emission crap but you should get the idea I think

The manual stop lever is on the IP, it's red and says STOP on it I recall. Right around the fourth injector.

A photo may help. I'll take any help I can get on this. Obviously I pulled some things apart so not only do I need to know where things go but I think I will also need some little tubes and hoses. I have found a few vac diagrams but they all seem a little incomplete-I'll study them some more. Any further tips on diagrams or should I bite the bullett and find a guy that can fix this?

I have found several diagrams for the vac system but none of them seem to be for my particular California car. Any tips on where I can get the right diagram? It seems most of the diagrams show the major components but often show open ends that are not completed to their end device.

there are one or in some cars two vent lines with open ends, They go to the atmosphere to vent some device on the engine and the theory MB had was to pull air from inside the car rather than under the hood where its probably dirty. The vent lines are always black.
There are two lines that go (went) to the yellow one way (check) valve and drive the CLS (central locking system) and control pods for the A/C. You may need to find a similar car and do an eyeball comparison.
Now you know one reason some JiffyLubes mandated a NO MERCEDES DIESEL policy! they mucked up more than few cars and their insurance bought some new engines after the owners drove out and lost all the oil due to something the oil changer tech did wrong:wacko:
Your back is probably real tired from replacing the stand gasket, so just try some vac lines and see if you get it right, its the transmission vac line that some people accidentally yank loose (then you have neck wrenching shifts)

I'll go snap some pics. Gimme about 10min to take them, transfer, and upload.

Hopefully these will help, lemme know if you need more pictures. :) Sorry it took so long, damned Photobucket went offline to update in the middle of Saturday afternoon. :confused: Please disregard that nasty 134A fitting, I did NOT install it. :D



http://img.photobucket.com/albums/v4...z/DCP_0008.jpg

http://img.photobucket.com/albums/v4...z/DCP_0009.jpg

http://img.photobucket.com/albums/v4...z/DCP_0010.jpg

http://img.photobucket.com/albums/v4...z/DCP_0011.jpg

http://img.photobucket.com/albums/v4...z/DCP_0012.jpg

Much thanks for the pix. Hopefully later today I'll get a chance to try to figure out a little more. It does appear your car may be slightly different than mine but hopefully I can still get it worked out.

Could be that I have a 126 SD also and I have removed my emission stuff, so it should at least give you an idea. :)

Well I have been looking over the situation and I'm not making too much progress. I did find a nipple broken off on the metering valve on the main vac line. That's easy with a new part. The rest of it isn't so easy. As best I can tell, several connections were not right even prior to my knocking things apart. At least that is my assessment going by the diagram found afixed to the car. Maybe the strangest situation is a black poly tube about 1 foot long and about 5mm diameter going thru the firewall. I noticed it pulled out with little or no resistance. I also pulled another small black tube out the same way. I pulled the panel off under the drivers side to see if I could find where they came from but couldn't find the place of connection...soooo I'm still quite puzzled. I hate to say it but I may have to break down and find a mechanic who has the ability to put it back in shape and have it done.

There is a black line that is supposed to be open under the dash. It doesn't connect to anything, it's a vent line.

I assume you've already looked at these vacuum diagrams?

http://www.peachparts.com/shopforum/showthread.php?t=105297

Yup, came to a big filter. That's gone on mine too, I wish I had better pics for the problem. You should see under my SDL, it's very limited with the vac lines. :D

If I get this right then the black poly no longer attaches to anything so I don't need to worry about that?? The smaller black tube also goes thru the firewall without connection in the area under the dash. The other end connects to the vacuum control valve if I see this correctly. Does that make sense?

Yes, the large black one with the filter you just remove and follow it over to the other emission crap. You'll pull off a BUNCH of tubing.

Vacuum " Schematics "... might help ya !
 

Although these are probably not all that you will need, why not try the following link and take a look at the vacuum diagrams:
http://www.peterschmid.com/
Go to the "Vacuum Schematics" menu entry in the left side of the Home Page... then year and model.
These are for use in working on the tranny vacuum components and EGR.

Sam

I have been looking at the vac diagrams quite a bit. It looks as though my car has been connected a little bit diffferently than the diagrams-maybe by the previous owner. Also the engine diagrams do not seem to have info on connecting the door lock and the climate control stuff. I believe the 2 yellow are the door locks and the green/yellow are the climate control. I am not sure where to connect them to what tube in the engine compartment.

Yorba Linda [SpyGuy], I trust you found…
 

the diagram at www.PeterSchmid.Com, the one that is titled “Functional diagram of vacuum line routing… Model Year 1985 California Version” ?

It is clear that CA really didn’t do its citizens any favors when they mandated complete re-engineering of these cars back then!! I found the EGR system on my 80 CA model 300D all but impossible to make work without causing major engine power/smoke issues! I'll have to get back to that another day.

I have NOT yet found a source of good Vac Diagrams for the door lock etc systems… at least one that also shows the engine compartment connections for these systems as well [ locks, eng. Shut-down on ignition, Environ.Etc ]. Maybe someone else has some sources they can tell us about!

I have a 1980 300D I will soon be looking to solve vacuum leaks in here soon!

Best of luck,
Sam

Thanks to all the exellent help, I think I am finally getting this figured out. Maybe a little more info and I'll have it:

1. There is a black tube that connects to the bottom of the vacuum control valve which is mounted on the injection pump.The diagram simple says it's a vent line to vehicle interior. Does that mean it goes thru the firewall and simply exists without connecting to anything?

2. There are 2 black tubes that are connected to the Electric-switch-over valve and the Electric vacuum control valve. These two things are located farely near the driver's side headlight.The two black tubes run rearward into a Y thus becoming one. Where does this one black tube go?

Once these are solved I'll just fix a few of the old connections and I'm done!!

SpyGuy, I can help you wit "1." but not "2.".......
 

and you got it right. The lower vacuum line from the Vacuum Control Valve [ VCV ] does go through the firewall and "daylights" there, connecting to nothing... that is unless you want to put some kind of filter on it to keep debris fron entering the vacuum system and possibly causing the VCV to not properly take in a measured amount of air [ " intake venting "].

IF you ever have this line out completely and then shove it through the firewall, take care not to introduce debris in shoving it back through. I recommend that you blow air through it after shoving it through and before reconnecting it to the VCV.

I have no knowledge of your subject in "2." and canNOT.

Sam

Thanks Sam. Hopefully question 2. will be answered soon. Also someone mentioned the stop or shut-off lever if the engine won't shut down. Where is that guy located? I have had the run-on situation but was hoping once I got all the vacuum tubes properly connected that might go away.

Spyguy,

What would you do without me? ..LOL... ;)


I told ya this forum was nothing put HELP & GOOD info!:D ...Great bunch of Guys & gals here!

Your Brother In Christ,

Matt

Spyguy,

Call Me.

As best I can tell my final mystery tube connects to nothing, as in it is supposed to simply hang in the atmosphere without a connection. Bothers my brain but that's the way they designed it. Thanks for all the help.

to be safe, let me ask this pregnant question...
 

what in the heck is connected to the other end of your dangling vacuum line??:confused:
Sam

One tube connects to the Switchover vacuum converter. The other tube connects to the Vacuum converter. The tubes leave the said units and are merged into one tube which the diagram indicates to vent into the vehicle interior. This according to the diagram for 1985 300D California. This means I have 2 tubes that go thru the firewall and simply attach to nothing but air. The other one comes off the Vacuum control valve attached to the injector pump.

Yep, you are right. After looking at that diagram...
 

I count my blessings that my 300D and 240D are 1980 models with a much simplier vacuum system in the engine compartment!

I also note the "vent filter" on this combined vacuum line that terminates in the assenger compartment! I thought such filters were just an old mechanic's trick!

What's next with your beastie?
Sam

Next are a few replacement parts already on their way for the vac connections. Then the new AC compressor goes in. I sure hope the climate control pods work. If not I'll rebuild them. After that, it's on to the veggie conversion. I recently converted my boat so I'm in the veggie processing mode, hence the reason I picked up the MB in the first place. I keep reminding myself this is all for fun!

I assume your "Environmental" [Heat & A/C ] is automatic...
 

and if so, yes there can be some big buck$ [$500-700!] decision you might face if you insist upon OEM... but there are some alternatives out there too so get back to the Forum if such happens and you want to save some $.

I might help a little, but there are others far more knowledgeable than I am.

Sam

http://www.diymbrepair.com/Vacuum/

Great diagrams there.