W202 headlight vacuum

[Ben Longden]

Had the mech inspect an oil weep on the C280 the other day. Coming from the vicinity of the oil filter. said he looked from under the car as well as on top.

Picked it up, and now the vacuum for headlight adjustment is inoperative.

So, Im assuming a line has been dislodged...

Now.. where would I have to look?
Ive followed the line back as as as possible from the headlamps.

Cheers,
Ben

 

[television]

The vacuum pipe plugs into the inlet manifold and goes to the switch in the dash, from there it goes to each headlamp, turn the lowering knob in the dash, if no hissing heard, the vacuum pipe is off on the manifold,

 

[bigasotonuk]

Check Vacuum pipe (grey in colour I think) goes across the back bulkhead from the fuse box area to the inlet manifold.
If you look in the pic below you can see the vacuum pipe concerned, this is in a C43, the same pipe runs the exact same route in my C230K so the chances are it will be the same as you're 280.

 

[Ben Longden]

Thanks Malcolm and Andy.. Will have a look on friday - ****** pitch black heading to the salt mine... and pitch ****** black when I stagger to the car park at the end of the day..

 

[Ben Longden]

Finally had a chance to have a look....

Followed the grey line along from the right hand side distribution box towards the engine and found this...




So.... placing the camera at the back of the engine bay to look forward under the ""arches" of the injection air flow thingy, I see what looks to be a vacuum point. (marked with red arrow in photo below)

Would I be right in thinking I just need to reattach the line to this point?

Also... what do the other lines from the distribution box operate? (I know one is the headlamp adjuster) and what effect is this current setup having on the engine?

 

[television]

Just push it back on and all back to normal

By rights that pipe being off should increase the idle speed a touch, but it is very small.

It is easily knocked off when removing the air box.

 

[Ben Longden]

Thanks Malcolm! Did what you said, and all working normal!!

I think the indie did what you said.. taking the airbox off at service, the line poppled off>

Cheers!