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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:fot-bounces@autox.team.net] On Behalf Of =
damys@charter.net
Sent: Thursday, May 12, 2016 7:16 AM
To: 'fot@autox.team.net' <fot@autox.team.net>
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> </=
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> </=
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> </=
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:fot-bounces@autox.team.net] <b>On Behalf Of =
</b>damys@charter.net<br><b>Sent:</b> Thursday, May 12, 2016 7:16 =
AM<br><b>To:</b> 'fot@autox.team.net' =
<fot@autox.team.net><br><b>Subject:</b> [Fot] Cracked =
Head<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </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. 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.<o:p></o:p></p><p>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. =
<o:p></o:p></p><p>Has anybody done this with success? Is there a =
water jacket between the exhaust and intake? What are =
the 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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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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