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The fire ring is still over the outside edge of the liner so works as it
should as far as sealing liner to head and pressing into block
appropriately. You'll either want a stock style payen head gasket
(put the seams on the block side) or something like the Cometic 91
mm. The liner protrusion (or lack thereof) would be a good cause
for a leak with a solid gasket.<br><br>
Cheers, Tony<br><br>
At 09:03 AM 4/6/2017, Bill Beecher wrote:<br>
<blockquote type=cite class=cite cite="">
<font face="Calibri" size=2 color="#1F497D">Hello Tony,<br>
Thanks for the input on the head gasket. I am wondering about
something as I tried to sleep, if the head gasket is oversized as I have
ordered what will be over the 86mm liners to keep them from moving
around? As you may have seen, my liners are about .002 below the
deck (not the best position) but one poster noted that protruding liners
was not good for an aluminum head.<br>
<br>
Am I overthinking this?<br>
<br>
Thanks,<br>
Bill<br>
<br>
<br>
<br>
</font><font face="Calibri" size=2><b>From:</b> Tony Drews
[<a href="mailto:tony@tonydrews.com" eudora="autourl">
mailto:tony@tonydrews.com</a>] <br>
<b>Sent:</b> Tuesday, April 04, 2017 10:53 AM<br>
<b>To:</b> Bill Beecher <bill_beecher@flash.net><br>
<b>Cc:</b> Triumphs <triumphs@autox.team.net><br>
<b>Subject:</b> Re: [TR] TR4A Aluminium Head<br>
</font><font face="Times New Roman, Times"> <br>
The larger diameter is to have the fire ring outside the intake valve
pocket in the head. I run smaller diameter pistons than 91mm
too. The 88 mm gasket has the fire ring inside the valve pocket and
that's instant leak.<br><br>
Regards, Tony<br><br>
At 10:44 AM 4/4/2017, Bill Beecher wrote:<br><br>
</font>
<dl>
<dd>I have 86mn pistons, do I need a 91mm to outskirt the liners?
Is Comtic the best head gasket for aluminum heads?<br><br>
<dd>Straightedge show no sign of warpage, and no visible damage any where
now that it is cleaned. <br><br>
<dd>Tom, how hot and how long in the oven? Can I just sneak it in
under Momma's biskets?<br><br>
<dd>Many thanks to all,<br><br>
<dd>Bill<br><br>
<br>
<dd>Sent from my Altair 8800<br><br>
<dd>On Apr 4, 2017, at 10:34 AM, Tony Drews
<<a href="mailto:tony@tonydrews.com">tony@tonydrews.com</a>>
wrote:<br><br>
<dd>Definitely has the symptoms of blown head gasket. I've had much
better luck with compressible gaskets than solid ones. Solid ones
need liner protrusion to be PERFECT.<br><br>
<dd>The Aluminum heads have the intake valves unshrouded like you'd get
if you milled a stock head. My latest head gaskets have been
Cometic ones. On line their store lists 88 mm gaskets but if you
call you can get a 91 mm gasket. This is almost large enough
diameter to keep the fire ring completely out of the combustion
chamber. Steve Yott was having some 92 mm ones made of a similar
design.<br><br>
<dd>I can't comment much on the head itself - I know one of my racing
competitors ran an aluminum head for a few years and had constant head
gasket problems so went back to iron at some point.<br><br>
<dd>Regards, Tony<br><br>
<dd>At 06:53 PM 4/3/2017, Bill Beecher wrote:<br><br>
<dl>
<dd>Content-Type: multipart/alternative;<br>
<dd>
boundary="----=_NextPart_000_001C_01D2ACAB.9B3A25B0"<br>
<dd>Content-Language: en-us<br><br>
<dd><font face="Calibri" size=2>Happy Monday List,<br>
<dd> <br>
<dd>Have had a problem with some water up in the rocker area of the
TR3(TR4A Motor) ever since I bought it last year. Just now getting
to a point where I can pull the head and see if I can see what the issue
is. Below are my observations:<br>
<dd>1. Did not know it was an aluminum head until today, re-torqued it
last year when I first saw this problem at 95lbs. Learned today it
should be 70lbs.<br>
<dd>2. Runs great, compression checks out good at 150-55 across
all. But after getting up to highway speeds then coming back to
town it quickly overheats and blows the water past the rad cap.<br>
<dd>3. Cannot see any damage to the solid copper head gasket. Is
this the right type gasket for an aluminum head?<br>
<dd>4. Cannot see any damage to the head, how do you check an aluminum
head? I would think that magnaflux would not work here.<br>
<dd>5. Drained and checked the oil last fall, no water present in the
case.<br>
<dd> <br>
<dd>Any suggestions from the collective wisdom would be greatly
appreciated, seems this motor was intended for some level of performance
as it also has Moss�s roller rockers. <br>
<dd> <br>
<dd>Many thinks to all,<br>
<dd> <br>
<dd>Bill B<br>
<dd>TS30800L<br>
<dd> <br>
<dd> <br>
<dd> <br>
<dd> <br>
</font><br>
<dd>**
<a href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a>
**<br><br>
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