[Vwdiesel] broke later style vacuum pump?

[Andrew .Libby]

I'm not sure.  I haven't run the engine without the top on the vac pump.
The one pump I had issues with, it didn't do much if you dumped oil down the
nipple.  Couple that with the fact that it's a pressurized oil channel that
feeds the center of the vac pump I have always assumed that the flow of oil
to the vac pump would be significant and likely visible if the nipple was
removed.

The oil supply for the vac pump comes from the oil pump shaft bushing,
travels up a channel in the shaft of the oil pump into the interface with
the vac pump gear and then up the vac pump shaft to squirt out the center of
the vane carrier.  The oil supply components that might cause an issue other
than general low oil pressure are the oil pump shaft bushing and the seal in
the bottom of the vac pump gear that seals to the oil pump shaft.  Also,
there could be a blockage in the path, most notably in the small screen in
the center of the vac pump.

Andrew

On Sat, Jun 12, 2010 at 1:35 PM, Will Taygan <william at taygan.com> wrote:

> I assume to see the oil flowing out the center I've got to take the top
> plate off?  I'm just looking through the broken nipple - had it stuck on
> with silicone, which made it easy to remove :).
>
> Will pull it in the next day or so, check and clean.  Gotta take the
> kids to the fair today with the newly-running 91 ecodiesel :)
>
> Thanks,
>
> Will in Alaska.
>
> On Sat, 2010-06-12 at 10:53 -0700, Andrew .Libby wrote:
> > Any issue with the oil supply to the later style plump will cause it to
> > produce almost no vacuum and is the only issue (other than busting the
> > nipple) I've ever personally had with the rotary style.  If you are not
> > seeing pressurized oil flowing out from the center of the pump I would
> > assume it is an oil supply issue.  I have a pump here that had a busted
> > nipple.  I purchased a brass check valve from mcmaster and installed it,
> but
>
> > haven't gotten to installing it to test it.  Should be a cheap and
> permanent
> > solution/improvement.
> >
> > Andrew
> >
> > On Sat, Jun 12, 2010 at 9:51 AM, <LBaird119 at aol.com> wrote:
> >
> > > In a message dated 6/11/2010 10:01:29 PM Pacific Daylight Time,
> > > william at taygan.com writes:
> > >
> > > > Unfortunately(?) I've got the later style pump.  I pulled the nipple
> > > > (loose fitting anyway) and can see the vanes turning, but no suction
> > > > when I put my finger over the hole.  I put a little oil in there, but
> no
> > > > go.  Rebuildable?  I've got some old-style pumps I could stick a new
> > > > diaphragm in, but would like to get this one going.
> > > >
> > >
> > >  Vanes could've gotten rusted in place.  They're synthetic but
> > > the rotor's metal.  The other option, or combination of problems,
> > > could be the rotor is worn.  If there's much gap between the top
> > > of the rotor and the top of the case, you have to mill down the
> > > case to a few thou clearance.  Mine had the worn rotor issue when
> > > I got it.  I only had the capability to file it down at the time.
> > >     Loren
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> > >
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>
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