Hi,

We've recently bought a 300d and in the process of changing the glow plugs knocked a rather hokey looking vacuum hose set up - it involved a four way splitter, a couple of valves, some spliced hoses and a purposefully blocked hose.

Being new to mercedes we didn't actually realize what it was until coming to turn the engine off and it didn't stop. So, we fiddled around and the set up that allowed us to turn the engine off had two vacuum hoses (the only two unconnected that we could see, maroon and yellow/orange in the pics) into the four way splitter, the four way splitter onto the main vacuum line and the fourth end of the spliiter blocked (currently with a reversed valve). And well...I have no idea how good/correct this really is and would love some advice.

I've tried following some vacuum line diagrams but haven't had much success. I also had a look at a vacuum trouble shooting guide on dieselgiant.com but couldn't see either the door lock check valve or the vacuum dashpot for the transmission mentioned there (no mention of what model is in that article - so maybe it's different).

I've posted a couple of pics of our current set up. My questions are: Does it seem reasonable? Am I missing any important valves? What are the lines going into the four way splitter for? Any pics of similar setups would be really useful to me.

We also have no central locking but figure I'll get this sorted before tracking down that problem. I'm also not entirely of the year - the previous owner says its 1983 but it was imported from Germany so the registration isn't any help in verifying that. I've inlcuded pics of the tags on the engine bay.

Thanks for any help! And let me know if any other pics or info would help.
Charlotte

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Look above your post to the vac diagram listed for 123, you need a mity vac to check for leaks, but you should be able to run the lines with the above diagrams
ron

That is a configuration I don't recognize (Euro). Try to find a better diagram, and you may want new correct connectors (splitters).

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83 SD

84 CD

Yes, I think this is the crux of my problem. With a decent diagram that somewhat resembled my car I would be fine. Any suggestions on where to look for a euro diagram?

I see an M-pump!! That's a Euro car.

Usually you have a Y that supplies the doorlocks and the climate control. The door lock side will split again which supplies the locks themselves(yellow line) and one that goes to the resevior(brown line). The check valve is usually on the supply side of the door lock Y. So you would have Y-check valve-Y-yellow & brown line.

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Thanks for the hint. Just to confirm the Y - check valve - Y should come directly off the main line? And climate control is interesting...we are missing something in our central console which I'm assuming was AC - it's above the heating controls. It's looks a bit different to other ones I seen - we have rotating knobs as opposed to switches. So, if the AC is gone can I get away with just the check valve then Y then yellow and brown.

And what's an M-pump? I'm new to this

Notice the in the 4th photo there is a pair of red nozzles that look like they take vacuum hoses. Should there be something on them?

Thanks so much for your help.

http://peterschmid.com/
Should be able to find your vacuum diagram there.

An M-pump can on Euro models and has the ability to be modified to squeeze a lot more horse power out. The regular pumps are MW pumps.

Sounds like you have manual climate control if you have the big knobs that rotate. Only the automatic climate control uses the vacuum.

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