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

[brian gochnauer]

It's a vacuum pump, if the shaft seal is bad, wouldn't it just 'suck' the
oil in.?

On 12/18/08, mark shepherd <mark at shepher.fsnet.co.uk> wrote:
>
> I'm sure the problem points to sticky vanes. If it is the oil, then I
> wonder
> if it's a residue buildup over a period  of time, or, an increase in sump
> pressure creating an excess of oil?
> I will give the vanes a clean. My sump pressure is significant, but with
> increase in revs all but dissappears, which makes me feel rings not all
> that
> bad., and not noticeably changed since last gasket change 6000 miles ago...
> If the pumps wear, then I assume vane faces would wear a little and slide
> easier if operation based on centrifugal forces. H'mm the arrows are
> pointing to sticky residue, releasing when warm...
> I'll clean tomorrow [today].
> Mark
> ----- Original Message -----
> From: <decker at toledotel.com>
> To: "mark shepherd" <mark at shepher.fsnet.co.uk>; "vw fans"
> <Vwdiesel at vwfans.com>
> Sent: Thursday, December 18, 2008 4:09 PM
> Subject: Re: [Vwdiesel] Brake boost failure....Update.
>
>
> >
> > 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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> >> >
> >> >
> >>
> >>
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> >
> >
> >
> >
>
>
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