Subject: [Fot] Cylinder head head scratcher.

From: John Linney via Fot <[email-masked]>
Date: Sun, 7 Feb 2021 21:10:18 -0800

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I=E2=80=99m wondering if anyone has seen anything like this in the =
attached photo. I found some coolant pooled around the number 4 spark =
plug on my TR4 head. I took this photo about 10 minutes after cleaning =
it up. Stone cold engine. It appears I=E2=80=99ve got coolant seeping =
through the head at that point. The crack is not in the threads as I had =
feared. Logic tells me this may not become a critical crack, but I =
don=E2=80=99t know the topology of those passages well enough to be =
certain. Might I soon be in search of a new head, or is this repairable? =
Could it be a crack or is it corrosion? The head part number is 511695. =
Would love to know what you all think.

=20=

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><font=
 color=3D"#000000" class=3D""><span style=3D"caret-color: rgb(0, 0, 0);" =
class=3D"">I=E2=80=99m wondering if anyone has seen anything like this =
in the attached photo. I found some coolant pooled around the number 4 =
spark plug on my TR4 head. I took this photo about 10 minutes after =
cleaning it up. Stone cold engine. It appears I=E2=80=99ve got coolant =
seeping through the head at that point. The crack is not in the threads =
as I had feared. Logic tells me this may not become a critical crack, =
but I don=E2=80=99t know the topology of those passages well enough to =
be certain. Might I soon be in search of a new head, or is this =
repairable? Could it be a crack or is it corrosion? The head part number =
is 511695. Would love to know what you all think.</span></font><div =
class=3D""><span style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, =
0);" class=3D""><br class=3D""></span></div><div class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);" =
class=3D"">&nbsp;</span><img apple-inline=3D"yes" =
id=3D"0AF35ED3-0BA0-42D5-86DD-1E094E78ADBE" width=3D"481" height=3D"480" =
src=3D"cid:2E17079D-DADA-43B5-B0EF-E8C591E6FCC1" =
class=3D""></div></body></html>=

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_______________________________________________
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From: John Linney via Fot <[email-masked]>
Date: Mon, 8 Feb 2021 21:42:05 -0800

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Had a closer look. There seem to be more like pin holes than cracks, so mayb=
e some corrosion got in there. I=E2=80=99m going to try K-Seal, and if that d=
oesn=E2=80=99t do it, keep an eye on it.=20

Thanks for all your feedback and help!

-john

> On Feb 8, 2021, at 5:33 AM, fubog1 via Fot <[email-masked]> wrote:
>=20
> =EF=BB=BF
> If that's a static leak, a pressure test would likely confirm your suspici=
ons.
> I checked a cut-up head that I have, there's a good bit of meat around the=
 plug hole but if there's heavy corrosion in the water jacket, that could be=
 the culprit.
> Glen
>=20
>=20
> -----Original Message-----
> From: John Linney via Fot <[email-masked]>
> To: Fot <[email-masked]>
> Sent: Mon, Feb 8, 2021 12:10 am
> Subject: [Fot] Cylinder head head scratcher.
>=20
> I=E2=80=99m wondering if anyone has seen anything like this in the attache=
d photo. I found some coolant pooled around the number 4 spark plug on my TR=
4 head. I took this photo about 10 minutes after cleaning it up. Stone cold e=
ngine. It appears I=E2=80=99ve got coolant seeping through the head at that p=
oint. The crack is not in the threads as I had feared. Logic tells me this m=
ay not become a critical crack, but I don=E2=80=99t know the topology of tho=
se passages well enough to be certain. Might I soon be in search of a new he=
ad, or is this repairable? Could it be a crack or is it corrosion? The head p=
art number is 511695. Would love to know what you all think.
>=20
> =20
>=20
>=20
> Donate: http://www.team.net/donate.html
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/[email-masked]=
om
>=20
>=20
>=20
>=20
> Donate: http://www.team.net/donate.html
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/john@linneyw=
eb.com
>=20
>=20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Had a closer look. There seem to be more li=
ke pin holes than cracks, so maybe some corrosion got in there. I=E2=80=99m g=
oing to try K-Seal, and if that doesn=E2=80=99t do it, keep an eye on it.&nb=
sp;<div><br></div><div>Thanks for all your feedback and help!<br><br><div di=
r=3D"ltr">-john</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Feb 8=
, 2021, at 5:33 AM, fubog1 via Fot &lt;[email-masked]&gt; wrote:<br><br>=
</blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF
<div style=3D"color:black;font: 10pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"2">If that's a static leak, a pressure test would likely=
 confirm your suspicions.</font></div>

<div><font size=3D"2">I checked a cut-up head that I have, there's a good bi=
t of meat around the plug hole but if there's heavy corrosion in the water j=
acket, that could be the culprit.</font></div>

<div><font size=3D"2">Glen</font><br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><font s=
ize=3D"2">-----Original Message-----<br>
From: John Linney via Fot &lt;[email-masked]&gt;<br>
To: Fot &lt;[email-masked]&gt;<br>
Sent: Mon, Feb 8, 2021 12:10 am<br>
Subject: [Fot] Cylinder head head scratcher.<br>
<br>

<div id=3D"yiv1318649121">
<div><font class=3D"yiv1318649121" color=3D"#000000"><span style=3D"" class=3D=
"yiv1318649121">I=E2=80=99m wondering if anyone has seen anything like this i=
n the attached photo. I found some coolant pooled around the number 4 spark p=
lug on my TR4 head. I took this photo about 10 minutes after cleaning it up.=
 Stone cold engine. It appears I=E2=80=99ve got coolant seeping through the h=
ead at that point. The crack is not in the threads as I had feared. Logic te=
lls me this may not become a critical crack, but I don=E2=80=99t know the to=
pology of those passages well enough to be certain. Might I soon be in searc=
h of a new head, or is this repairable? Could it be a crack or is it corrosi=
on? The head part number is 511695. Would love to know what you all think.</=
span></font>
<div class=3D"yiv1318649121"><span style=3D"color:rgb(0, 0, 0);" class=3D"yi=
v1318649121"><br class=3D"yiv1318649121"></span></div>

<div class=3D"yiv1318649121"><span style=3D"color:rgb(0, 0, 0);" class=3D"yi=
v1318649121">&nbsp;</span><div>&lt;PastedGraphic-13.png&gt;</div></div>
</div>
</div>
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