JH Engine oil pressure issues

[calimus at techography.net (calimus)]

oil pan was clean, very clean.  However, I've swapped pumps and put
everything back together.  While the pump out of the old cabby provided much
more pressure at cold start, after letting the car warm up a bit and having
my wife take it for a drive then letting it sit in the driveway at idle for
about 5 more min. the pressure dropped back down below .5bar and the oil
light came on.  At this point the oil temp was 105c which is a bit hotter
then I like it but I know it's within the running range.

I'm really grasping at straws now because in my limited knowledge, I can't
think what would cause such a pressure drop once things warm up.  Also, what
reading in bar should the car have at idle?  .5, 1.0?  Bently doesn't state
in bar.  Getting pretty frustraited at this point so I'm open to any and all
suggestions.

William
----- Original Message -----
From: "John Lagnese" <jlagnese@massed.net>
To: "calimus" <calimus@techography.net>; "Scirocco-l"
<scirocco-l@scirocco.org>
Sent: Sunday, September 28, 2003 5:11 PM
Subject: Re: JH Engine oil pressure issues


> There could be crap in the oil pan. Especially after flushing it. If you
> turn the motor off after the engine is warm is the pressure still low? If
> not, pull the pan.
> John
> ----- Original Message -----
> From: "calimus" <calimus@techography.net>
> To: "Scirocco-l" <scirocco-l@scirocco.org>
> Sent: Sunday, September 28, 2003 3:57 PM
> Subject: JH Engine oil pressure issues
>
>
> > This is a bit OT as it's for the wifes cabby, but hey, it could be a
> > scirocco if you use your imagination.
> >
> > Ok, a week or so I posted a similair question, but now I'm in the thick
of
> > things and doen't like what I see.  Both the cars internal gages and a
> > manual oil pressure gage tell me that after about 15-20min the oil
> pressure
> > in the head at idle drops to just below 0.5bar on the vdo gage and on
the
> > manual gage it's so close to 0 I really wouldn't know what to call it.
> Now
> > this is after bumping the oil up to 20w-50 since the PO's had 10w-30 in
it
> > before.  I also flushed the motor twice to make sure all the gunk would
be
> > out of it.
> >
> > So I figured that it might be the pump (which documentation shows was
> > replaced in 97' and only 7k miles put on the car since then, but since
> they
> > had it done at a shope I was wondering if it had really been done) so I
> tore
> > the pump out of our wrecked cabby since i knew it was good, then dropped
> the
> > pan on the new cabby and there sites a bright shiny brand new'sh febi
oil
> > pump.  Now I'm conserned since the pump looks like it was just put in
> > yesterday, could it really be bad?  If figure I'll go ahead and swap the
> > pumps and see what happens, but I need to know where else I could
develope
> > an oil pressure problem in the head after about 15-20min of good 3bar
> > pressure.  Now the pressure doesn't fall like a rock, but after about
> 10min
> > is starts to drop down as the oil temps reach about 80c.  I'm kinda at a
> > loss since on cold start pressure is good then falls off.  So if you
> > guy's/gals can hit me back with things that I can check to try and
figure
> > this out, I would be very gratefull.
> >
> > Thanks,
> > William Snyder
> >
> > 88' Scirocco 16v
> > 89' Cabriolet 8v (R.I.P.)
> > 71' Karmann Ghia
> >
> >
> >
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>
>
>