I used the Fel-Pro product recommended by Dennis and it worked fine for me.
Make sure everything is nice and clean and dry before torquing the nut down.
I don't know if it makes much difference, but I used a new nut...

MM

>From: Dennis Haynes <dhaynes57@EMAIL.MSN.COM>
>
>I use a product called "Bolt Prep". Sold by FEL-PRO.  It is a combination
>sealer, thread lube(torque accuracy) and thread locker.  Coat the threads
>and flange.  Resist the urge to fill the nut.  The stuff will get trapped
>and not allow the nut to seat properly.  Has worked great for me.
>
>Dennis
>
>-----Original Message-----
>From: Joshua Van Tol <jjvantol@USWEST.NET>
>To: vanagon@GERRY.VANAGON.COM <vanagon@GERRY.VANAGON.COM>
>Date: Monday, May 24, 1999 1:57 PM
>Subject: waterboxer head nuts leak
>
>
> >Does anyone have suggestions for stopping 1.9 liter waterboxer head nuts
> >from leaking? I have a presistent problem with two of them.
> >
> >I've tried the standard vw sealing compound, silicone, head gasket
>sealant,
> >and even, most recently, copper sealing washers. Nothing has worked.
> >
> >The sealing surface on the head is a bit scarred up, which probably
> >accounts for the problem. So, any suggestions? I'm thinking of trying
>some
> >permatex 3H on the nuts.
> >
> >My only other recourse, as far as I can tell, is to remove the head, and
> >have the sealing surfaces remachined.
> >
> >Joshua Van Tol -- jjvantol@uswest.net

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