[Vwdiesel] Brake boost failure....Update.

[decker at toledotel.com]

Hi Mark;
    I have never had a problem with a vane pump. I grab one whenever I can
find one. The diaphragm pumps work but even when rebuilt seem to be a
problem later down the road. I have never taken a vane pump apart because I
have never had one fail. I would think that unless one is just plain worn
out the only thing that might cause a problem is sticking vanes. Perhaps
taking it apart and cleaning it in carburetor cleaner or a hot tank might
help. I'm completely shooting in the dark since in my experience they always
work. If any of my friends find out that I have bought a parts car with one
in it they practically fight over the silly thing
Brian Decker
Western Washington
----- Original Message ----- 
From: "mark shepherd" <mark at shepher.fsnet.co.uk>
To: "vw fans" <Vwdiesel at vwfans.com>
Sent: Thursday, December 18, 2008 4:07 AM
Subject: Re: [Vwdiesel] Brake boost failure....Update.


> OK today's [Thursday] report:
> Temperature this morning 5 to 10  deg C. Upon starting the car and
operating
> brake, gauge rose to about 5" WG, and then died. Revving engine did
nothing.
> Possibly residue escaping from last night?
> Vaccuum began appearing within about 1/4 of a mile of yesterday's point
> [before it].
>
> Been good all morning. 'RH Turn' effect may just be nothing.
>
> The opened out pump couldn't be simpler; but does any one have an accurate
> description?
>
> For example, apart from centrifugal force, does the oil actually force the
> vanes apart, or is it just a lubricant?
> I guess I'll have to run it with the lid off and watch for a fountain :o)
>
> Farmer Joe  have you cut one open? LOL
>
> Mark
>
> ----- Original Message ----- 
> From: "mark shepherd" <mark at shepher.fsnet.co.uk>
> To: "vw fans" <Vwdiesel at vwfans.com>
> Sent: Thursday, December 18, 2008 3:22 AM
> Subject: Re: [Vwdiesel] Brake boost failure....Update.
>
>
> >
> > One further possible quirk noticed just before getting home, is that it
> > appeared that vaccuum drops 2 or 3 inches when making a sharpish rh
> > turn!!!
> > Further investigation needed I think :lol:  Does orientation[ rotation]
of
> > vane pump have any effect upon operation?
> >
> > Quantum Bentley $46 delivered to UK. I suppose it is a heavy book. but I
> > thought we were the 52 state of America ;op
> >
> > Mark
> >
> > ----- Original Message ----- 
> > From: "mark shepherd" <mark at shepher.fsnet.co.uk>
> > To: "vw fans" <Vwdiesel at vwfans.com>
> > Sent: Wednesday, December 17, 2008 3:50 PM
> > Subject: Re: [Vwdiesel] Brake boost failure....Update.
> >
> >
> >>
> >> Vac  holds  for hours. In fact there may be a residue overnight!
Plenty
> >> of lubrication in chamber.  This morning ran to town. No vaccuum on
> >> gauge,
> >> until driven  a mile or so , and then it returned completely within a
few
> >> seconds. Operates every trip  immediately, and hot  or cold reaches
about
> >> 23 in wg. Problem must be with the vanes somehow.  Temp this morning
was
> >> around zero. Car windows iced yet no ground frost.
> >> Maybe there is too much oil?
> >> More pointers please.
> >> Mark
> >>
> >> Sniped  a Quantum Bentley a few days ago  for $6, alas postage may kill
> >> me
> >> though!
> >>
> >>
> >> >
> >>
> >
> >
> > _______________________________________________
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> > Vwdiesel at vwfans.com
> > http://www.audifans.com/mailman/listinfo/vwdiesel
> >
> >
>
>
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