Might be just that simple too!
Cut some out of a nice soft silicone rubber sheet.

--- In BiturboZentrum@yahoogroups.com, "Enrico" <maserati123@...> wrote:
>
> Hi Jason,
>
> Can't you make extra thick rubber gaskets to fit in the filler caps to ensure
a tighter fit ?
>
> Enrico.
>
>
> ----- Original Message -----
> From: mike.mcauliffe@...
> To: BiturboZentrum@yahoogroups.com
> Sent: Thursday, February 18, 2010 12:05 AM
> Subject: [BiturboZentrum] Re: Biturbo Spyder cam cover weeping??
>
>
>
> Enrico,
>
> Not right now- I'm replacing the tranny, so the car's off the road, but I am
very sure that the leak is from the caps. The leak definitely falls down the
neck of the filler tube, and is not from anywhere else.
> That staatsof states there is a venting through the air cleaner (Wow, I
haven't seen that, so that's like a wake-up slap in the face) is a revelation.
Guess I need to look further. I have inspected my caps- the gaskets are in good
condition, and I have even repositioned (bent back) the two arms that secure the
cap to the neck in case there was some wear. Still, not 100% effective.
> Thank you, gentlemen, for your help.
>
> v/r,
>
> MM
>
> --- In BiturboZentrum@yahoogroups.com, "Enrico" <maserati123@> wrote:
> >
> > Hi Mike,
> >
> > Could you please send me a few photos showing exactly wheer the oil is
leaking from ?
> >
> > Thank you,
> >
> > Enrico.
> >
> >
> > ----- Original Message -----
> > From: mike.mcauliffe@
> > To: BiturboZentrum@yahoogroups.com
> > Sent: Tuesday, February 16, 2010 11:26 PM
> > Subject: [BiturboZentrum] Re: Biturbo Spyder cam cover weeping??
> >
> >
> >
> > My complaint is with my oil filler caps. I can't seem to get them to stop
leaking. I'm suspecting that I may have a combination of light oil (10w40 right
now) and a bit of blowby- leakage of pressure from the valves, etc. through the
tops of the heads- causing a higher pressure than ordinarily. High pressure and
oil getting tossed about under the valve covers can cause an oil leak. Hope I'm
wrong, I am often.
> >
> > --- In BiturboZentrum@yahoogroups.com, "enrico3634" <e.pederzolli@> wrote:
> > >
> > > I have an 1986 Biturbo Spyder and cannot stop the valve covers from
weeping.
> > >
> > > New seals last a while, but what is the true solution ????
> > >
> > > Or do I just have to live with it.
> > >
> > > Jason.
> > >
> >
>