mbkutil

Hi everybody,

I have a 2005 MB – E320 and recently I did remove the intake manifold to replace the vacuum hose on the bottom of the manifold. But I noticed that there is some sort of plastic valve on the back of the manifold, see picture. Does anybody know what it is and what it does? The center part comes out very easily without any force at all, and I am afraid that one of these days it will come out on its own, and I will lose it. How can I hold it in? Maybe super glue?Thanks.
Jan

konigstiger

Internal locking ring may need replacement (17)

Racin_fool

If you are going to be in there replacing #17, also replace the sealing ring #11.. that o-ring will cause a vacuum leak over time once it turns to hard plastic and stops sealing.

kajtek1

Your arrow shows to vacuum tube quick disconnect. Once you put the tube in, it all suppose to interlock.

Racin_fool

That intake manifold doesn't have a vacuum tube that goes in there. That is a factory plug that fits in place of that tube which is normal on some of these engines.

Russell Ormerod

It's a blankoff, otherwise it's used for the brake booster vacuum

mbkutil

Thanks everybody for the response. So, basically since this is just a plug, not in use, I just could glue it in instead of trying to remove it and possibly breaking it. It doesn’t seem to be doing anything. Am I wrong?

mbkutil

Thanks everybody for the response. So, basically since this is just a plug, not in use, I just could glue it in instead of trying to remove it and possibly breaking it. It doesn’t seem to be doing anything. Am I wrong? How do you remove it anyway?

Racin_fool

you can use a fine tipped flat blade screw driver to carefully pry off #23 in the first picture. Then you can carefully pull out #17 and then finally take a small pick and remove the o-ring #11. If #11 has never been changed its going to be hard as plastic instead of a nice rubber o-ring that you can get from the dealer or online. Then just put it back together in reverse from what you removed it.

mbkutil

Here is another picture without the center piece (plug).

kajtek1

I am not familiar with this engine, but what other say - it is just plugged off vacuum port.
I would wonder howcome it become loose, but I would advise against monkey job with bending the springs and adding aftermarket oring. Vacuum leaks are hard to troubleshoot and few $$ saved now can cost you lot of grief in the future. Not even talking about engine sucking dirt via loose port.
Go to a dealer and buy whole socket as looks like this one was beaten up.

mbkutil

Dam, I wish I noticed the lose plug before I put the manifold back last night. Now it is quite difficult to get to, so I have to weigh my option. Should I take the manifold out again or try to remove the plug the way it is?! At least I know what it is for, and I don’t really need it, but it has to be sealed properly. The interesting thing is that I don’t see any “O” ring inside and that is probably why it is so lose. Is it possible that they forgot to put one in? Who knows. Thanks everyone for the response.

kajtek1

For the time being I would wrap whole thing with kitchen wrap, what should last for couple of weeks, but unless you like your engine feed with sand, get it done right.
That would be good time to send oil sample to Blackstone Lab.