<div dir="auto">My guess would be that the mating faces of the carbs are not flat or the spacer is compressed at the stud holes. <div dir="auto">I encountered the same issue with my MGBGT.</div><div dir="auto">Carefully filing the carb faces flat and sanding the faces of the spacers on a surface plate seemed to eliminate the issue.</div><div dir="auto">Also use no sealant on the gasket surfaces ... it can make them slip under high vacuum.</div><div dir="auto"><br></div><div dir="auto">M</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun., Sep. 4, 2022, 7:26 p.m. Bob Haskell, <<a href="mailto:rchaskell@earthlink.net" target="_blank" rel="noreferrer">rchaskell@earthlink.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<font size="2"><font face="Courier 10 Pitch">Listers,<br>
<br>
The tri-carb intake parts are:<br>
</font></font>
<ul>
<li><font size="2"><font face="Courier 10 Pitch">intake manifold</font></font></li>
<li><font size="2"><font face="Courier 10 Pitch">gasket</font></font></li>
<li><font size="2"><font face="Courier 10 Pitch">heat shield</font></font></li>
<li><font size="2"><font face="Courier 10 Pitch">gasket</font></font></li>
<li><font size="2"><font face="Courier 10 Pitch">1/4" insulator</font></font></li>
<li><font size="2"><font face="Courier 10 Pitch">gasket</font></font></li>
<li><font size="2"><font face="Courier 10 Pitch">HS4 carb</font></font></li>
</ul>
<p>The gaskets are all the same, shaped like the carb base with two
holes for the carb mounting studs. I have a reoccurring issue of
the gaskets tearing and blocking the air stream. A couple weeks
ago we found the two gaskets on either side of the heat shield
were bad on the front carb. <br>
</p>
<img src="cid:part1.k0LL8R0L.EQLkgjQe@earthlink.net">
<p>Today it looks like the gasket between the intake manifold and
the heat shield is bad on the center carb. The first time was a
couple of years ago.</p>
<p>The only non-standard parts I have fitted are the 1/4" insulating
spacer and the nuts that hold everything together. I got sticker
shock for the spacers - $40+/each. So I made my own using a 1/4"
thick linen phenolic laminate sheet, a router and a MGB HS4 spacer
for the pattern. Instead of nuts and lock washers, used AN half
height lock nuts. Had also fitted a PCV valve to the first intake
manifold, but have recently removed it.</p>
<p>Any thoughts as to why the gaskets are being destroyed? <br>
</p>
<pre cols="72">
Cheers,
Bob Haskell
Austin Healey 3000 BN7/BT7 registrar</pre>
</div>
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