Subject: [Fot] Darn It!

From: Robert Lang via Fot <[email-masked]>
Date: Tue, 10 Oct 2023 20:30:52 +0000 (UTC)

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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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_______________________________________________
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http://www.fot-racing.com

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot

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From: Joe Boruch via Fot <[email-masked]>
Date: Tue, 10 Oct 2023 22:52:57 +0000 (UTC)

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 Bob, often machine shops can install valve seats, if the current seat is c=
racked or too deep.=C2=A0 Might need to do the exhaust seat at the same tim=
e.JoeB
    On Tuesday, October 10, 2023 at 04:50:16 PM EDT, Robert Lang via Fot <f=
[email-masked]> wrote: =20
=20
 Doing a routine engine check on Sunday - found a problem with the intake v=
alve on one cylinder. Pulled the head and valve - there's a burn mark on th=
e 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 rou=
ghly 40% leakdown past the intake.
Drat.
Spending time tonight trying to get the backup cylinder head prepped an ins=
talled.
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 lea=
k-down test didn't lie. Glad I pulled it before I broke something. Hopefull=
y, the head is salvageable.=20

Regards,Bob Lang

o.com

 =20
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<html><head></head><body><div class=3D"ydpec45acf6yahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">Bob, often machine shops can=
 install valve seats, if the current seat is cracked or too deep.&nbsp; Mig=
ht need to do the exhaust seat at the same time.</div><div dir=3D"ltr" data=
-setdir=3D"false">JoeB</div><div><br></div>
       =20
        </div><div id=3D"ydp30797557yahoo_quoted_7274198782" class=3D"ydp30=
797557yahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Tuesday, October 10, 2023 at 04:50:16 PM EDT, Robert=
 Lang via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"ydp30797557yiv3004158990"><div><div style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;" class=3D"ydp30797557yiv3004158990yahoo-style-wrap"><div dir=3D"ltr">Doin=
g 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 bac=
k 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.</div><div dir=3D"ltr"><br></div><div dir=3D"l=
tr">Drat.</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Spending time to=
night trying to get the backup cylinder head prepped an installed.</div><di=
v dir=3D"ltr"><br></div><div dir=3D"ltr">I need to make a race weekend star=
ting on FRI (racing FRI/SAT at Thompson.</div><div dir=3D"ltr"><br></div><d=
iv dir=3D"ltr">On the one hand, I'm glad I found it - the engine sounded fi=
ne. But the leak-down test didn't lie. Glad I pulled it before I broke some=
thing. Hopefully, the head is salvageable. <br></div><div dir=3D"ltr"><br><=
/div><div dir=3D"ltr">Regards,</div><div dir=3D"ltr">Bob Lang<br></div></di=
v></div></div>_______________________________________________<br><a href=3D=
"mailto:[email-masked]" rel=3D"nofollow" target=3D"_blank">[email-masked]=
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