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I read a couple of people talking about milling the block deck. I have
seen two blocks that were milled, one on a club member's car that had head
gasket issues and another on a block I was checking to build a race engine.
No doubt that both had been milled with the block flat on the milling
table. With liners in place, boring plate installed, the deck surface was
off by 2 thousands side to side. Not very head gasket friendly. I did some
measuring and realized that the figure 8 surface was also off by the same
amount. Both could have been the result of sloppy machine work but I came
to the conclusion that the factory block deck and figure eight machining
was done at the same time. I haven't yet decked a block but if I did I
would measure the figure 8 surface relative to the deck first. YMMV.
Bob Kramer
On Sat, Aug 1, 2020 at 4:51 AM Phil Gott via Fot <fot@autox.team.net> wrote=
:
> Michael;
> It is also critical that the liners protrude above the block by .005 to
> .007=E2=80=9D to ensure a good seal. This is before any compression of th=
e figure 8
> gaskets. If the protrusion is less, the top of the block should be mille=
d
> to achieve the proper protrusion.
> If you have milled the head more than about .060 you should consider
> staking the head around the bores between cylinders two and three per the
> Kastner book. It is weak in this area.
> The rest of the advice you=E2=80=99ve received is pretty sound, but I hav=
e not
> tried all of it.
> Depending on how much you=E2=80=99ve milled the head and what you have do=
ne with
> the combustion chambers, you may need to reshape the fire ring area of yo=
ur
> gasket. It must not protrude at all into the combustion chamber.
> Phil
>
>
> Sent from my iPhone
>
> On Jul 31, 2020, at 6:25 PM, Jack Wheeler via Fot <fot@autox.team.net>
> wrote:
>
> =EF=BB=BF
> I've read all of the comments, but haven't heard anything about Cometic.
> I had rebuilt my TR-3 engine a number of years ago, using the stock head
> gasket. I built the engine as I would have built one of my race engines =
in
> the day, except with a milder cam and less compression (10.5:1). From da=
y
> 1 it never really ran right. I began to suspect coolant was getting into
> the combustion chamber, so I bought one of those test kits where you pull
> some coolant out while the engine is running and add a chemical which tes=
ts
> for hydrocarbons. Sure enough, hydrocarbons were getting into my coolant
> system. That says bad head gasket or crack in the head. Since I'd had t=
he
> head magnafluxed during the rebuild, I assumed it was the head gasket.
>
> I began asking around about where I could get a good gasket. A guy at a
> local engine shop (primarily Ford engines) recommended Cometic. I had
> never heard of them, and told him the engine was over 50 years old, so
> surely they would not make a gasket for it. He encouraged me to check th=
e
> internet, and sure enough, they make a whole bunch of them for the TR
> engine. It's been a few years ago, but as I recall, they had gaskets for
> different bores (i.e. 83MM, 86MM, 87MM, etc.) and you could order differe=
nt
> thicknesses. They stacked steel gaskets on top of each other to get to t=
he
> thickness desired. I think I ordered a 3 layer gasket. It all sounded a
> little fishy, but based on the strong recommendation I had received, I
> ordered one.
>
> I removed the bad head gasket and replaced it with the Cometic gasket, an=
d
> suddenly the engine ran great. I have put almost 7.000 miles on the car
> since then and haven't had a problem. It runs cool (even on 95 degree
> days, as tested recently), pulls strong, and no sign of any coolant leaks=
.
> By the way, I noticed someone else recommended Hylomar gasket cement. I
> also used that. A light coat on all sealing surfaces does the trick. Do
> not spray a thick coat. Below is the link to the Cometic web site. Chec=
k
> it out.
>
> Cometic Gasket - Sealed Under Extreme Pressure <https://www.cometic.com/>
>
> Cometic Gasket - Sealed Under Extreme Pressure
>
> Cometic Gasket supplies hi-performance gaskets for a variety of
> motorsports markets: ATV, Drag Race, Domestic Au...
> <https://www.cometic.com/>
> Jack
>
>
>
>
>
> On Friday, July 31, 2020, 5:27:49 PM EDT, mleccese1--- via Fot <
> fot@autox.team.net> wrote:
>
>
> Phil, Dave,
>
> I may have compromised my head gasket last weekend at Lime Rock (Green TR=
4
> #802), can you or someone recommend one that is robust.
>
> Thank you
> Michael L
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
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>
>
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>
> http://www.fot-racing.com
>
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>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
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>
>
>
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<div dir=3D"ltr">I read a couple of people talking about milling the block =
deck.=C2=A0 I have seen two blocks that were milled, one on a club member&#=
39;s car that had head gasket issues and another on a block I was checking =
to build a race engine. No doubt that both had been milled with the block f=
lat on the milling table. With liners in place, boring plate installed, the=
deck surface was off by 2 thousands side to side. Not=C2=A0very head=C2=A0=
gasket friendly. I did some measuring and realized that the figure 8 surfac=
e was also off by the same amount. Both could have been the result of slopp=
y machine work but I came to the conclusion that the factory block deck and=
figure eight machining was done at the same time. I haven't yet decked=
a block=C2=A0but if I did I would measure the figure 8 surface relative to=
the deck first. YMMV.<div><br><div><div><div dir=3D"ltr" class=3D"gmail_si=
gnature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr">Bob Kramer</di=
v></div></div><br></div></div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Sat, Aug 1, 2020 at 4:51 AM Phil Gott via =
Fot <<a href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>> wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D=
"auto">Michael;<div>It is also critical that the liners protrude above the =
block by .005 to .007=E2=80=9D to ensure a good seal. This is before any co=
mpression of the figure 8 gaskets.=C2=A0 If the protrusion is less, the top=
of the block should be milled to achieve the proper protrusion.</div><div>=
If you have milled the head more than about .060 you should consider stakin=
g the head around the bores between cylinders two and three per the Kastner=
book. It is weak in this area.</div><div>The rest of the advice you=E2=80=
=99ve received is pretty sound, but I have not tried all of it.</div><div>D=
epending on how much you=E2=80=99ve milled the head and what you have done =
with the combustion chambers, you may need to reshape the fire ring area of=
your gasket. It must not protrude at all into the combustion chamber.</div=
><div>Phil<br><br><br><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D=
"ltr"><br><blockquote type=3D"cite">On Jul 31, 2020, at 6:25 PM, Jack Wheel=
er via Fot <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@=
autox.team.net</a>> wrote:<br><br></blockquote></div><blockquote type=3D=
"cite"><div dir=3D"ltr">=EF=BB=BF<div style=3D"font-family:"Helvetica =
Neue",Helvetica,Arial,sans-serif;font-size:13px"><div></div>
<div dir=3D"ltr"><span><cite>I've read all of the comments, but=
haven't heard anything about Cometic.=C2=A0 I had rebuilt my TR-3 engi=
ne a number of years ago, using the stock head gasket.=C2=A0 I built the en=
gine as I would have built one of my race engines in the day, except with a=
milder cam and less compression (10.5:1).=C2=A0 From day 1 it never really=
ran right.=C2=A0 I began to suspect coolant was getting into the combustio=
n chamber, so I bought one of those test kits where you pull some coolant o=
ut while the engine is running and add a chemical which tests for hydrocarb=
ons.=C2=A0 Sure enough, hydrocarbons were getting into my coolant system.=
=C2=A0 That says bad head gasket or crack in the head.=C2=A0 Since I'd =
had the head magnafluxed during the rebuild, I assumed it was the head gask=
et.</cite></span></div><div dir=3D"ltr"><span><cite><br></cite></span></div=
><div dir=3D"ltr"><span><cite>I began asking around about where I could get=
a good gasket.=C2=A0 A guy at a local engine shop (primarily Ford engines)=
recommended Cometic.=C2=A0 I had never heard of them, and told him the eng=
ine was over 50 years old, so surely they would not make a gasket for it.=
=C2=A0 He encouraged me to check the internet, and sure enough, they make a=
whole bunch of them for the TR engine.=C2=A0 It's been a few years ago=
, but as I recall, they had gaskets for different bores (i.e. 83MM, 86MM, 8=
7MM, etc.) and you could order different thicknesses.=C2=A0 They stacked st=
eel gaskets on top of each other to get to the thickness desired.=C2=A0 I t=
hink I ordered a 3 layer gasket.=C2=A0 It all sounded a little fishy, but b=
ased on the strong recommendation I had received, I ordered one.</cite></sp=
an></div><div dir=3D"ltr"><span><cite><br></cite></span></div><div dir=3D"l=
tr"><span><cite>I removed the bad head gasket and replaced it with the Come=
tic gasket, and suddenly the engine ran great.=C2=A0 I have put almost 7.00=
0 miles on the car since then and haven't had a problem.=C2=A0 It runs =
cool (even on 95 degree days, as tested recently), pulls strong, and no sig=
n of any coolant leaks.=C2=A0 By the way, I noticed someone else recommende=
d Hylomar gasket cement.=C2=A0 I also used that.=C2=A0 A light coat on all =
sealing surfaces does the trick.=C2=A0 Do not spray a thick coat.=C2=A0 Bel=
ow is the link to the Cometic web site.=C2=A0 Check it out.<br></cite></spa=
n></div><div dir=3D"ltr"><span><cite><br></cite></span></div><div dir=3D"lt=
r"><a href=3D"https://www.cometic.com/"; rel=3D"nofollow" target=3D"_blank">=
Cometic Gasket - Sealed Under Extreme Pressure</a></div><div><br></div><div=
id=3D"gmail-m_2554743525888803341ydp48b58523enhancr_card_6247372032" style=
=3D"max-width:400px;font-family:YahooSans,"Helvetica Neue","=
Segoe UI",Helvetica,Arial,sans-serif"><a href=3D"https://www.cometic.c=
om/" style=3D"text-decoration:none solid currentcolor;color:rgb(0,0,0)" rel=
=3D"nofollow" target=3D"_blank"><table style=3D"max-width:400px" cellspacin=
g=3D"0" cellpadding=3D"0" border=3D"0"><tbody><tr><td width=3D"400"><table =
style=3D"max-width:400px;border-width:1px;border-style:solid;border-color:r=
gb(224,228,233);border-radius:2px" width=3D"100%" cellspacing=3D"0" cellpad=
ding=3D"0" border=3D"0"><tbody><tr><td><table style=3D"background-color:rgb=
(255,255,255);background-repeat:repeat;background-image:none;background-siz=
e:auto;width:100%;max-width:400px;border-radius:0px 0px 2px 2px;border-top:=
1px solid rgb(224,228,233)" cellspacing=3D"0" cellpadding=3D"0" border=3D"0=
"><tbody><tr><td style=3D"background-color:rgb(255,255,255);padding:16px 0p=
x 16px 12px;vertical-align:top;border-radius:0px 0px 0px 2px"></td><td styl=
e=3D"vertical-align:middle;padding:12px 24px 16px 12px;width:99%;font-famil=
y:YahooSans,"Helvetica Neue","Segoe UI",Helvetica,Arial=
,sans-serif;border-radius:0px 0px 2px"><h2 style=3D"font-size:14px;line-hei=
ght:19px;margin:0px 0px 6px;font-family:YahooSans,"Helvetica Neue"=
;,"Segoe UI",Helvetica,Arial,sans-serif;color:rgb(38,40,42);max-w=
idth:314px">Cometic Gasket - Sealed Under Extreme Pressure</h2><p style=3D"=
font-size:12px;line-height:16px;margin:0px;color:rgb(151,155,167)">Cometic =
Gasket supplies hi-performance gaskets for a variety of motorsports markets=
: ATV, Drag Race, Domestic Au...</p></td></tr></tbody></table></td></tr></t=
body></table></td></tr></tbody></table></a></div>Jack<div><br></div><div><b=
r></div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br></div><div><br></di=
v>
=20
</div><div id=3D"gmail-m_2554743525888803341ydp82cd51b4yahoo_quoted=
_6952941027">
<div style=3D"font-family:"Helvetica Neue",Helvetica,=
Arial,sans-serif;font-size:13px;color:rgb(38,40,42)">
=20
<div>
On Friday, July 31, 2020, 5:27:49 PM EDT, mleccese1--- =
via Fot <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@aut=
ox.team.net</a>> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"gmail-m_2554743525888803341ydp82cd51b4yiv98=
85013498">
<div style=3D"color:black;font-style:normal;font-weight:normal;font-stretch=
:normal;font-size:10pt;line-height:normal;font-family:arial">
<div><font size=3D"2">Phil, Dave,</font></div>
<div><font size=3D"2"><br>
</font></div>
<div><font size=3D"2">I may have compromised my head gasket last weekend at=
Lime Rock (Green TR4 #802), can you or someone recommend one that is robus=
t.</font></div>
<div><font size=3D"2"><br>
</font></div>
<div><font size=3D"2">Thank you</font></div>
<div><font size=3D"2">Michael L<br>
</font></div>
</div>
</div>_______________________________________________<br><a href=3D"mailto:=
fot@autox.team.net" rel=3D"nofollow" target=3D"_blank">fot@autox.team.net</=
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</blockquote></div>
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