Vacuum?

[Neophyte]

All,
Can anyone explain to me or point to a link that explains whhat the vacuum thing is? btw I've a '92 190e, auto, 2.6. . Is it a way of operating components? I could have sworn that I read somwehere that it powered/effected central locking?

It's a total mystery to me and aint really mentioned in my Haynes manual.

PS -
I'm picking up stuff here like there's no tomorrow! I reckon I might even be dishing out advice within the decade! ha.

Cheers

 

[SUE.]

Mercedes use a vacuum system for operating lots of parts on your car,not just the central locking.

 

[Neophyte]

Thanks!

Ahhh, there's a system whereby a vacuum is used to move parts, inc. central locking. I thought there was an extra connection when I opened the door! And in the manner of an electrical system they are routed around the vehicle. Crazy! Does it include the windows? Does it include the headlight adjustment? Those Geeeermans (Stan Boardman voice), eh? That should be much better than electrical when a car's older - I had an old 3 series Beemer with an electrical problem that couldnt be traced - had to scrap it cos of it (bit of a banger anyway).

Useless ****** Haynes manual dont even mention it! does it have a 'technical' name?

God bless y'all!

 

[SUE.]

The headlight tilt is worked bye vacuum ,but not the windows,they are electric.ie electric windows.

 

[SLinKyjoe]

now is the Dyson electric or vaccum?

sorry couldnt resist.

 

[pascal]

Vacuum: Very reliable dellivery of motion to an object.
............ Also smooth and torqey.

Aeroplanes still use a vacuum pump to spin gyros in the important instruments.

Although these systems are different than MBs, they are favoured over motors for the same reason.

 

[Neophyte]

hoovers!

That's it! take the p*ss outta the fick kid! Cheers ya slinky article!
Pascal, you're a very good man! thanks. I know this is damned fundamental.. but is a vacuum/pressure created in a central resevoir and then 'piped' around the car to move stuff??!! :-? or does electrical power go to vacuum 'motors' which then, rather than using a servo or whatever, use a little pumpy thing to move stuff?

 

[SLinKyjoe]

yeah sorry about that!

I am glad that mr 100% didnt object and start saying it isnt a vacuum cleaner. it just reduces the air pressure and the beater whips up the dust which is blown into the bag/container by the fact that the external air pressure is greater than that where the beater bar is postioned and therefore has the effect of sucking much like you would expect a vacuum to act rather than it actually being a vacuum!

I did pay attention at school, But normally that kind of thing was explained to me in a loud voice as i was being removed from the class for asking what i thought was a normal question but obvioulsy it turned out to be daft just like me. It always came with the expression Had you been listening the first time instead of chatting/looking out the window you would have known this, get out boy! And dont come back until you have learnt something, which i always found strange as i was meant to learn in class not sat outside! Grammar Schools eh?

mind you, i do chuckle to myself as i drive the mercedes past my old school with all them teachers in beat up SAAB's. What I cant understand is why they insist on looking at me in a jealous way. And whats worse is that they always asked me to come and go on about my job at their careers fair and they get all the children to look out the window at my car. it is bit sad that isnt it? even worse when they say this was a pupil here a few years back and look at him and what he has achieved. I always managed to get a wry smile from the children when i produce my old school report and read some of the comments. It's really good when 2 or 3 of the teachers who wrote them remarks are in the class too (they are not good comments). Although they have got wise to it now and excuse themselves.Those children should all go and be doctors or something that pays real money instead of being up to your eyes in debt like me.

now had i been a mechy I could have answered your question couldn't i? and so the school has let me down again.

 

[guydewdney]

some parts of the system are motr driven - others work off the manifold 'vacuum' (without intending to offend slinkyjoe... )

the pumps are under the o/s rear seat, or in the boot under the side lining.

there is often a reservoir tank for the vacuum in the n/s wing.

seat back locks on coupes / roadsters are done by vacuum, and electrically controlled vents are vacuum controlled

the pump system has a pump with a manifold and set of valves - the pump pumps causes a vacuum or pressure (in the case of the self closing doors on the S class) which goes to a small 'element' (a small box with a rubber diaphram on it) - which is then blown open or closed by the air pressure.

find the manifold for the section you want to look at, and get a big syringe - connect syring to to the pipe and suck. the element should operate and open the doofer in question.

if theres a leak, the syringe will keep moving... finding the leak is a different matter.


interestingly - the coupe seat release system is identical in my 1968 designed car as it is on my 1996 car... and the 1968 designed (1972 built) still works...

 

[pascal]

Sorry Neophite for not getting back.

Guy explain it nicely.

For central locking see http://ow.no/index.php?option=content&task=view&id=98&Itemid=86

Pascal

 

[Neophyte]

Hoovers explained +

Thanks All, you're stars! I'm getting there! Have just come back after taking 'The Dutchess' on a spin down to Poole in Dorset from Sunny Acton where I'm a denizen. I notice a huge difference in fuel consumption between driving gently and like a hooligan. I do know there's always gonna be a big difference but I'm seriously impressed that a 2.6 can get me so far on the amount of juice it does when driving in a 'sensible manner' BTW if anyone's driving around Salisbury the A35 is a lovely road in that neck o' the woods...

Does anyone reckon the wind noise in 190s is a bit excessive? at v. high speed? I know it looks to have the aerodynamics of a brick but it is supposed to have a low drag co-efficient..? the set-back windscreen (if ya know what I mean?) is common on the older Mercs, I wonder why? Do door seals make a big difference? My drivers side one is a bit dog-eared...

PS a word of warning... never drink Old Speckled 'en into double figures, especially when ya got work in the morning!