[s-cars] Changed Pump X-Plug, No Brake Boost - Any Ideas?

[Kirby Smith]

new o-ring binding the spring?

Fred Munro wrote:
> 
> Hi Kirby;
> 
> There is a spring under the cap which extends when you remove the cap. I
> assume the spring loads the piston. I didn't see any orifices. There are no
> pumps in the bomb at all, so I assume the pump is not pumping. I'm going to
> try re-installing the old o-ring and see if that helps.
> 
> Fred
> 
> -----Original Message-----
> From: Kirby Smith [mailto:kirby.a.smith at verizon.net]
> Sent: January 18, 2004 1:36 PM
> To: Fred Munro
> Cc: s-cars
> Subject: Re: [s-cars] Changed Pump X-Plug, No Brake Boost - Any Ideas?
> 
> Fred:
> 
> I think steering and braking are on separate circuits at opposite ends
> of the pump.  Presumably, the high pressure end is the end where the
> high pressure hose connects.
> 
> O-ring thickness sensitivity is very interesting.  (And raises a
> question about design shortcuts, as if we didn't have one given that the
> o-rings leak, something that shouldn't happen with a static ring.)  Not
> having looked into an x-plug hole, I don't know what is in there besides
> a rumored piston.  Are there any orifices near the o-ring?  Did you
> change the "compression ratio"?  You get no pumps from the bomb?
> 
> kirby
> 
> Fred Munro wrote:
> >
> > Hi Guys;
> >
> > The hydraulic pump X-plug on my '94 S4 was leaking, so I changed the
> o-ring.
> > Prior to removing the plug I bled off the pressure from the bomb - it took
> > 50 pumps. I pulled the plug and replaced the o-ring with a slightly
> thicker
> > one I had on hand, so the plug doesn't seat to exactly the same depth. It
> > doesn't leak, but the bomb won't pressurize. I ran the car for 5 minutes
> or
> > so - no brake boost at all. The power steering works fine. Any ideas? What
> > circuit is the piston under the plug on - brake or steering?
> >
> > TIA
> >
> > Fred Munro
> > '94 S4
> >
> > -----Original Message-----
> > From: s-car-list-bounces at audifans.com
> > [mailto:s-car-list-bounces at audifans.com]On Behalf Of Dave Forgie
> > Sent: January 18, 2004 12:55 PM
> > To: s-cars
> > Subject: [s-cars] Fumoto Valve and Michelin Man Issues
> >
> > S-gruppees:  I changed my oil yesterday. While doing so I noticed one
> > on-going problem and one "new" one:
> >
> > 1. There was oil on the intercooler inlet - obviously from a leak around
> > the Michelin Man outlet end.  I had this problem before - bad OE gear
> > clamp.  I thought that I had cured it with a new gear clamp.  Apparently
> > not.  I took the hose off, cleaned out some of the oil puddled in the
> > big accordian pleats, cleaned the outlet end of the hose and the inlet
> > end of the IC and then put it back together.  Tightened things up real
> > good (I think).  Should I be looking at a better clamp, like the ones
> > people have used with the SAMCOs?
> >
> > 2.  I have been running a Fumoto drain valve for years. I thought
> > everything was fine but on closer inspection, i.e. during the time I was
> > playing with the Michelin Man, I noticed that the Fumoto was weeping out
> > the end (not at the ball) where there is a circular plate and an the
> > C-clip.  I don't remember this before.  I didn't do anything different
> > this time.  Has it always been doing this and I didn't notice before
> > because the belly pan got put on too quickly?  (The motor doesn't use
> > any oil in 5000 km). The belly pan has oil and dirt on it but I have
> > never cleaned it. (Going out right now to the pressure car wash to clean
> > it).  Any BTDT's or??
> >
> > TIA
> >
> > Dave F.
> >
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