Date:         Tue, 12 Jun 2012 12:41:25 -0600
Reply-To:     Robert Stevens <mtbiker62@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Robert Stevens <mtbiker62@GMAIL.COM>
Subject:      Re: Question re water tank cap
In-Reply-To:  <CAPADQa77ArtNNE7PyJKVgV6xBzohdBEVDwUDJQBgj6B-pCWkpg@mail.gmail.com>
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> Yesterday I tried both of them. Both appear to screw onto
> the drain opening OK, but both of them have a slow leak. Has anyone had an
> experience with this that they were able to resolve and would be willing to
> share with me? Please p-mail if you do!

I just did the same thing, bought the 2 caps, not knowing for sure which was
which by looking at the BD site. It turns out that there are 2 different thread-pitch
sizes, and mine is the wider spaced pitch, and it works fine. I could tell by crawling
under the van a looking at the drain pipe threads which cap would work.

If you put both caps on, you may have altered that thread pitch just enough that
using the larger-pitched cap (I also have an '87) that it now leaks a little. I'd
suggest addiing another rubber gasket inside the cap to allow the cap to be
tightened a little more, appllying so much pressure to that new gasket, that
the drain pipe can't leak. Both of the caps I got from BD had rubber gaskets
in them. Take the one out of the cap you don't use, add it to the cap you will
use so that there ar 2 in there, and see if that does the trick.

bob