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Doing a routine engine check on Sunday - found a problem with the intake valve
on one cylinder. Pulled the head and valve - there's a burn mark on the back
face of the intake valve. Lapped it and the seal surface looks good, did a
temporary installation and leak-down check. No go, still getting roughly 40%
leakdown past the intake.
Drat.
Spending time tonight trying to get the backup cylinder head prepped an
installed.
I need to make a race weekend starting on FRI (racing FRI/SAT at Thompson.
On the one hand, I'm glad I found it - the engine sounded fine. But the
leak-down test didn't lie. Glad I pulled it before I broke something.
Hopefully, the head is salvageable.
Regards,Bob Lang
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<html><head></head><body><div class=3D"yahoo-style-wrap" style=3D"font-fami=
ly:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir=
=3D"ltr" data-setdir=3D"false">Doing a routine engine check on Sunday - fou=
nd a problem with the intake valve on one cylinder. Pulled the head and val=
ve - there's a burn mark on the back face of the intake valve. Lapped it an=
d the seal surface looks good, did a temporary installation and leak-down c=
heck. No go, still getting roughly 40% leakdown past the intake.</div><div =
dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D=
"false">Drat.</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div di=
r=3D"ltr" data-setdir=3D"false">Spending time tonight trying to get the bac=
kup cylinder head prepped an installed.</div><div dir=3D"ltr" data-setdir=
=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">I need to make =
a race weekend starting on FRI (racing FRI/SAT at Thompson.</div><div dir=
=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"fa=
lse">On the one hand, I'm glad I found it - the engine sounded fine. But th=
e leak-down test didn't lie. Glad I pulled it before I broke something. Hop=
efully, the head is salvageable. <br></div><div dir=3D"ltr" data-setdir=3D"=
false"><br></div><div dir=3D"ltr" data-setdir=3D"false">Regards,</div><div =
dir=3D"ltr" data-setdir=3D"false">Bob Lang<br></div></div></body></html>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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