If a once sealed head suddenly starts leaking at a head nut, you have have
to consider one of two things happened. The head cracked near the stud or
the stud lost tension. You may get lucky and be able to remove the nut and
reseal it but the loose of tension indicates the stud stretched and a future
snapped stud is likely.

If you do the reseal thing you want to get a new nut. Clean the threads and
use a lubrcant on the threads. I like Hylomar or a loc-tite sealant on the
nut flange. If the nut does not tighten as it is being torqed down, stop.
Remove the head and replace at least that stud befroe it snaps.

Dennis

>From: Kim Springer <kimspringer@RCN.COM>
>Reply-To: Kim Springer <kimspringer@RCN.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Coolant leaking at upper head nut
>Date: Mon, 3 Mar 2008 23:34:30 -0800
>
>On another note, I have a very small coolant leak coming from an upper head
>nut. I've never heard this mentioned and didn't find anything in the
>archives.
>
>I know the head studs are in the cooolant jacket and that sealant is used
>to
>seal the studs to the heads.
>
>Boston Bob, Jeff, any experience with this? Subi time Benny Boy?
>
>Thanks,
>
>Kim