Walter;
        The first thing that comes to mind; sealant in the nut preventing it
from screwing all the way down. Swap it  with another one. While you have
the other one off compare how much thread is exposed. Maybe the bolt
backed out some. The most likely scenario is a small crack that is
opening as you torque down.

Good Luck and Drive Safely
Ken Lewis temporarily hailing from OKC
86 Transporter Crew Cab , 60 356 Coupe
http://NekSiwel.20m.com/

On Tue, 14 Aug 2001 16:58:03 -0700 Walter E Stephens
<aerocraf@WHIDBEY.COM> writes:
> I have just replaced the head on 90 Vanagon with a 2.1L engine.  I
> have a leaky cylinder head nut.  I have tried 3 different sealants
> and nothing stops the coolant from leaking past the nut.  I can not
> see a visable crack, but the coolant just flows as if the nut were
> not there.
>
> Has anyone else had a similar experience, or suggestion to make?  I
> hate to have to remove the head again.
>
> Walter E. Stephens
> ACS - AeroCrafters Supply
> POB 455
> Langley, WA  98260
> (360) 221-5039
> www.acs-aerocrafters.com

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