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Date:         Mon, 17 Aug 2009 17:19:48 -0700
Reply-To:     neil N <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         neil N <musomuso@GMAIL.COM>
Subject:      Re: Dometic Exhaust O Ring
In-Reply-To:  <c4e7c5f90908011152n2aa9ef56vbf8e7a4747fc5297@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

On Sat, Aug 1, 2009 at 11:52 AM, neil N<musomuso@gmail.com> wrote: > Hi all. > > In refitting the exhaust/intake manifold on my 182B, the exhaust O > ring broke. Likely I should replace the ring on both the exhaust and > inlet pipes. (there was a slight leak at this part in spite of added > muffler cement. Pipes ok) > > What can I use as a replacement? Are these rings neoprene? Maybe get > from my FLAPS? >

So thanks to Phil Z's prompting, I checked out his suggestion of BC Bearing Engineering LTD. They sent me to Wriason Seals:

http://www.wriason.com/contact.html

here in Vancouver. They sized up Viton O-rings for me. Fit fine.

The long story is below, but suffice it say that the rings worked. I "safety" sealed between pipes and manifold with Hi-temp RTV once pipes installed on manifold. Am happy that there are not leaks now.

Writeup and pics over on Samba. Hopefully this link works:

http://www.thesamba.com/vw/forum/viewtopic.php?t=370404

Otherwise most text posted below.

Neil.

Installed these on 2nd groove of each pipe. Double checked that 2nd groove correct by measuring with calipers (not exact in pic, but you get the idea) then compared this measurement to ridge inside manifold. It seems the front face of O-ring seats against this ridge. Also checked by trying O-rings on 3rd groove. It didn't seal. And my 182A had the O-rings in what I assume was the original (unmoved by me) position on the 2nd groove. I say this as I had read somewhere that the 3rd groove was the correct position. I don't think it is.

Emery clothed pipes to clean up muffler cement I had applied a while back. BAD IDEA I suspect this also removed enough metal from groove where O-ring sits, to allow a reduction in OD of ring. This caused new O ring on exhaust pipe to leak a hair. But, another part of the problem was that pipe grooves didn't line up when installing the retainer bit. i.e. exhaust pipe sat a little further out. Not damage done by my hand! I filed end of exhaust pipe a *little* so it would go further into manifold. This way grooves lined up. Still, the O-ring on exhaust pipe seated further into manifold. Likely past the little ridge where I suspect the O-ring normally pushes up against to provide seal.

Edit: When I pulled the fridge before doing this work, I noted a hair sized leak at pipe/manifold. This may have been due to exhaust pipe length and issue with retainer.

Bottom line: if you need to clean up leftover muffler cement, find a suitable chemical to do the job. And filing is a last resort. I just couldn't see any other way in a way to make grooves line up.

I used Hi-temp RTV as a "safety" seal at pipes/manifold. (yellow arrows pointing where in pic) System sealed fine, w/o it, but since cocking things up a little, did this. Would likely do this regardless.

A 182A exhaust pipe is different in length (to my eye) and the grooves are different. Slightly larger at high point. (arrows below) I figured since I boobed up a little (see above), I would just swap in a 182A pipe. No go. Even with some tenuous bending (shaping) of 182A pipe, when little retainer bit installed, it would push pipe slightly OC, thus a small leak happened. Drove me batty until I compared pipes. Pretty sure that little difference in groove size was pooching things up!

-- Neil Nicholson '81 VanaJetta 2.0 "Jaco"

http://tubaneil.googlepages.com/

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines


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