Subject: Re: [Fot] Cracked Head

From: "Steve Yott" <[email-masked]>
Date: Thu, 12 May 2016 08:56:06 -0500

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Dave and Alex,

Your =E2=80=9Chead guy=E2=80=9D is spot on.  The method he prescribes =
for this repair is the standard way of getting the head back into =
service.  Heat is the culprit when it comes to cracking heads.  You will =
generally find that the 6 cylinder and tractor motors both have issues =
with cracking between the seats on the rear cylinders.  That is where =
the most heat builds up and causes the damage.  Cracking will usually =
begin in the exhaust seat area and propagate from there and usually into =
the intake seat area.  If the crack is not too deep the seat replacement =
method is sound as the replacement seats are available in =
=C2=BC=E2=80=9D and 5/16=E2=80=9D depths.  If the cracking goes down the =
port area of the exhaust then welding is the best fix other than finding =
another head=E2=80=A6

=20

You are luck there was not more serious damage=E2=80=A6.=20

=20

Steve Yott

=20

From: Fot [mailto:[email-masked]] On Behalf Of =
[email-masked]
Sent: Thursday, May 12, 2016 7:16 AM
To: [email-masked]' <[email-masked]>
Subject: [Fot] Cracked Head

=20

Started our GT6 Tuesday night to load it in the trailer for Elkhart and =
heard clanking. Thought we had sucked something into the intake. Turns =
out the exhaust seat in number 1 cylinder came loose and was pulverized. =
 Found a 1/2" crack between the intake and exhaust. Remarkably, no =
damage to the valves. Lots of seat dust on top of the piston.

My head guy thinks he can pin the crack and overlap the seats to repair =
it.  I've probably read where this has been done before but can't =
remember.=20

Has anybody done this with success?  Is there a water jacket between the =
exhaust and intake?  What are the possible causes for this crack?

Thanks,

Dave and Alex

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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Dave and =
Alex,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Your =
=E2=80=9Chead guy=E2=80=9D is spot on.=C2=A0 The method he prescribes =
for this repair is the standard way of getting the head back into =
service.=C2=A0 Heat is the culprit when it comes to cracking =
heads.=C2=A0 You will generally find that the 6 cylinder and tractor =
motors both have issues with cracking between the seats on the rear =
cylinders.=C2=A0 That is where the most heat builds up and causes the =
damage.=C2=A0 Cracking will usually begin in the exhaust seat area and =
propagate from there and usually into the intake seat area.=C2=A0 If the =
crack is not too deep the seat replacement method is sound as the =
replacement seats are available in =C2=BC=E2=80=9D and 5/16=E2=80=9D =
depths.=C2=A0 If the cracking goes down the port area of the exhaust =
then welding is the best fix other than finding another =
head=E2=80=A6<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>You are luck =
there was not more serious damage=E2=80=A6. <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Steve =
Yott<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Fot [mailto:[email-masked]] <b>On Behalf Of =
</b>[email-masked]<br><b>Sent:</b> Thursday, May 12, 2016 7:16 =
AM<br><b>To:</b> [email-masked]' =
&lt;[email-masked]&gt;<br><b>Subject:</b> [Fot] Cracked =
Head<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p>Started our GT6 Tuesday night =
to load it in the trailer for Elkhart and heard clanking. Thought we had =
sucked something into the intake. Turns out the exhaust seat in number 1 =
cylinder came loose and was pulverized.&nbsp; Found a 1/2&quot; crack =
between the intake and exhaust. Remarkably, no damage to the valves. =
Lots of seat dust on top of the piston.<o:p></o:p></p><p>My head guy =
thinks he can pin the crack and overlap the seats to repair it.&nbsp; =
I've probably read where this has been done before but can't remember. =
<o:p></o:p></p><p>Has anybody done this with success?&nbsp; Is there a =
water jacket between the exhaust and intake?&nbsp; What are =
the&nbsp;possible causes for this =
crack?<o:p></o:p></p><p>Thanks,<o:p></o:p></p><p>Dave and =
Alex<o:p></o:p></p></div></body></html>
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_______________________________________________
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http://www.fot-racing.com

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From: Jason Ostrowski <[email-masked]>
Date: Thu, 12 May 2016 12:04:45 -0500

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Darn Sorry to hear that.
I was looking forward to hearing about how it went at Brainard and RA.
Sorry you won't be making it to Road America.
How did it go at the test day anyway?
Were all the temps and pressure on par?

Its good that you found the problem at home and not after you hit the track.
On a separate note,
Perhaps you know this already;
But, I my infinite wisdom brought forth by those who raced before me...
GT6 racecars are not the best candidates to be driven onto the trailer.
A winch or a push is the only method that is Friendly Ghost Racing approved.
One of those little procedures that simply delays inevitable failure.

Hang in there. Hope you get it back together soon.

Jason Ostrowski
Friendly Ghost Racing
1969 Triumph GT6+ Racecars

On Thu, May 12, 2016 at 7:15 AM, <[email-masked]> wrote:

> Started our GT6 Tuesday night to load it in the trailer for Elkhart and
> heard clanking. Thought we had sucked something into the intake. Turns out
> the exhaust seat in number 1 cylinder came loose and was pulverized.  Found
> a 1/2" crack between the intake and exhaust. Remarkably, no damage to the
> valves. Lots of seat dust on top of the piston.
>
> My head guy thinks he can pin the crack and overlap the seats to repair
> it.  I've probably read where this has been done before but can't remember.
>
> Has anybody done this with success?  Is there a water jacket between the
> Donate: http://www.team.net/donate.html
> Forums: http://www.team.net/forums
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/[email-masked]
>
>
>
>

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<div dir=3D"ltr"><div>Darn Sorry to hear that.</div><div>I was looking forw=
ard to hearing about how it went at Brainard and RA.</div><div>Sorry you wo=
n&#39;t be making it to Road America.</div><div>How did it go at the test d=
ay anyway?</div><div>Were all the temps and pressure on par?</div><div><br>=
</div><div>Its good that you found the problem at home and not after you hi=
t the track.</div><div>On a separate note,</div><div>Perhaps you know this =
already; </div><div>But, I my infinite wisdom brought forth by those who=C2=
=A0raced before me...=C2=A0</div><div>GT6 racecars are not the best candida=
tes to be driven onto the trailer.</div><div>A winch or a push is the only =
method that is=C2=A0Friendly Ghost Racing=C2=A0approved.</div><div>One of t=
hose little procedures that simply delays inevitable failure.</div><div><br=
></div><div>Hang in there. Hope you get it back together soon.</div><div><b=
r></div><div>Jason Ostrowski</div><div>Friendly Ghost Racing</div><div>1969=
 Triumph GT6+ Racecars</div><div><br></div><div>=C2=A0=C2=A0</div></div><di=
v class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, May 12, 2016=
 at 7:15 AM,  <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" ta=
rget=3D"_blank">[email-masked]</a>&gt;</span> wrote:<br><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex"><div><p>Started our GT6 Tuesday night to load it in the trai=
ler for Elkhart and heard clanking. Thought we had sucked something into th=
e intake. Turns out the exhaust seat in number 1 cylinder came loose and wa=
s pulverized.=C2=A0 Found a 1/2&quot; crack between the intake and exhaust.=
 Remarkably, no damage to the valves. Lots of seat dust on top of the pisto=
n.</p><p>My head guy thinks he can pin the crack and overlap the seats to r=
epair it.=C2=A0 I&#39;ve probably read where this has been done before but =
can&#39;t remember. </p><p>Has anybody done this with success?=C2=A0 Is the=
re a water jacket between the exhaust and intake?=C2=A0 What are the=C2=A0p=
ossible causes for this crack?</p><p>Thanks,</p><p>Dave and Alex</p></div>
<br>_______________________________________________<br>
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