As usual, thanks for all the replies (just gotta love this list!!). So,
having actually done things correctly, I still have leaks at the intake
manifold. I had determined this by spraying carb cleaner and noting the
definite change when I hit the leaky spots with the spray.
As noted, I used cut washers to shim the difference, but although it's not
as leaky as it was, it still leaks. I made sure that the surface of the head
was clean, used a brand new, undamaged gasket, and made sure the flanges on
the intake manifold were clean. I had also had a machine shop put the
manifold on their belt sander to make sure the flanges were clean, smooth
and true.
Any tricks that may be helpful here? Is a double gasket a really bad idea? I
guess the proper thing is to have it planed down to match the exhaust
header, but it seems like I should have been able to get a good seal by
using the washers to shim it. When I disassemble it again, I'll check the
head with a straight edge as was suggested to me...
Learning a lot (mostly about what NOT to do!)...
'73 MGB
'80 MGB
--
-----------------------------------------------------------
Marc Siegel, Charm Net, LLC. eMail: smarc@abs.net
Baltimore, MD http://www.charm.net voice: 410/361-8160
-----Original Message-----
From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net]On
Behalf Of Max Heim
Sent: Sunday, March 23, 2003 4:24 PM
To: MG List
Subject: Re: Vaccuum leak WAS: RE: Gasket orientation??
I believe different manifolds from different years had different flange
thicknesses, so your problem is not uncommon in a "mix and match" situation.
Usually, shimming the washers is the solution.
on 3/23/03 1:10 PM, Marc at smarc@abs.net wrote:
> Thanks to Jerry and David for the reply. I asked as I wasn't sure if I had
> done it correctly. I did, and my reasoning was sound! Anyway, I still have
a
> slight vacuum leak at the intake manifold even after replacing the gasket.
I
> also replaced all four manifold studs and nuts. This is a ZS to dual SU
> conversion. I note that the flanges on my intake are slightly thicker than
> those of the exhaust manifold. I cut a few washers to shim the difference,
> but the leak is still there. I could have the manifold belt-sanded to take
> off the difference, but I wonder if maybe my exhaust manifold (of unknown
> origin) is too thin...
>
> Anybody who's done this conversion come across (and solved) this issue?
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