Best solution:
Install new oil cooler seals.
Oil filter mount gasket.
New oil filter.
Check the threads in the oil pressure sender, it may just be a minor leak
at this point that collects then settles and dumps once the fan isn't
blowing it up into the cylinder and head area.
Double check for push-rod tubes sealing and valve cover tensioner springs
being very nice and tight.
Also gaskets sometimes slip on the valve covers when installing them.
Try starting with a very clean engine and the detective work will be
reduced.

Stan Wilder

On Sun, 11 May 2003 13:29:32 -0700 Andrea Berardelli <doctorb@IMAG.NET>
writes:
> Hello Fellows,
>
> I just installed a air cooled 1,8 in my Westphalia.
>
> I did the rebuild myself and it is not the first engine I do,
> Although it
> is the first pancake.  But I have done Porsche engines before. I
> think I did
> follow the book very closely,
>
> The engine has two  Solex, electric fuel pump, (thus a blanking
> plate where
> the mechanical pump once was),  Pertronic and it is stock
> otherwise.
>
> The engine starts and runs well,  sounds great and does not
> vibrate.
>
> There is a slow leak from the right cam cover, fine,
>
> The odd problem is that there is a large leak of oil from the
> general area
> of the oil cooler immediately AFTER the engine is switched off.
> Then it
> stops, after damping say a 1/2 quart.
> If the engine is restarted and then switched off even only after a
> few
> second, the leak reappears.  Then it stops.
>
> What is this?  Does not leak under pressure, but does at rest, for a
> while
> only.
>
> I took the cooler out, it is not leaking,  it may be leaking from
> the cooler
> to block  seals, but why?  It is all new and seemingly in good
> shape.
>
> Any help much appreciated.
>
> Best Regards, Andrea
>
>

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