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I also thought that I did not need hardened valve seats in my 1966 TR4A wit=
h only 24,000 original miles. However, after a 5 hour run at a steady 75 to=
85 miles an hour, my exhaust valves receded 0.005" to .006". I am using Sh=
ell 90 Octane non ethanol gasoline. So, I removed the head, and had hardene=
d seats installed. I also used the opportunity to replace and seal the push=
rod tubes, since they were badly leaking.
=C2=A0My 1959 TR3A got hardened valve seats as part of its complete restora=
tion two years ago.=C2=A0Alex Levy59 TR3A66 TR4A=C2=A0=C2=A0
In a message dated 10/23/2024 2:10:31 PM Eastern Daylight Time, grglmn@gmai=
l.com writes:=C2=A0
I never heard about the adoption of hardened valve seats early on for Trium=
ph or other imports.=C2=A0 Word on the street in the 80s was we needed to g=
et hardened valve seats, find leaded fuel, or run an additive in our fuel f=
or our sixties and early seventies cast iron head=C2=A0 British cars.=C2=A0=
=C2=A0=C2=A0I remember using some kind of lead additive/octane booster in m=
y daily drivers at that time, don't know if it made any difference.=C2=A0=
=C2=A0=C2=A0Since then I have had many hobby cars and many thousands of mil=
es of use with no lead or additives and no problems.=C2=A0Greg Lemon68 TR25=
0
On Wed, Oct 23, 2024, 11:36=E2=80=AFAM Don Hiscock <don.hiscock@gmail.com> =
wrote:
I=E2=80=99ve never heard that bit about satellite seats, John, but it=E2=80=
=99s certainly possible.=C2=A0=C2=A0My recollection is that unleaded fuel f=
irst started becoming available in America circa 1973-75 and it became domi=
nant in the 1980s. It=E2=80=99s hard to imagine engineering changes by the =
British motor industry being made in the 1960s for unleaded gasoline in the=
USA. Later on, perhaps.=C2=A0
On Wednesday, October 23, 2024, John Macartney <johnbmacartney@gmx.com> wro=
te:
Does anyone out there have documentary evidence (in the form of Service Bul=
letins issued by the factory or Leona NJ) that makes specific mention of th=
e introduction of stellite valve seats in place of earlier and softer alter=
natives? I do recall BMC making something of a hoo-haa about stellite seats=
being used in the MGB and Healey 3000 back in the sixties. Same applied to=
Rootes Group and Jaguar.
There is hearsay in the UK that hardened seats went into heads for the US m=
arket at about the same time because of the introduction of unleaded fuel. =
That hearsay also suggests hardened seats were territory specific but from =
an ease of production standpoint, having two different types of seat during=
machining and manufacture just doesn=E2=80=99t make sense. I can think of =
other examples where Standard-Triumph adopted a =E2=80=9Cone type fits all=
=E2=80=9D applied and that goes for other British makes.
It=E2=80=99s clear that valve seat recession fears in Europe has been a kne=
ejerk reaction to a problem that never really existed which suggests stelli=
te valve seats were fitted for all markets. An engineering or service bulle=
tin back in the day would have confirmed this but I never remember seeing o=
ne. Thoughts anyone?
Jonmac
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ock@gmail.com
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<div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
font-style: normal; font-weight: normal;">I also thought that I did not ne=
ed hardened valve seats in my 1966 TR4A with only 24,000 original miles. Ho=
wever, after a 5 hour run at a steady 75 to 85 miles an hour, my exhaust va=
lves receded 0.005" to .006". I am using Shell 90 Octane non ethanol gasoli=
ne. So, I removed the head, and had hardened seats installed. I also used t=
he opportunity to replace and seal the push rod tubes, since they were badl=
y leaking.<br></span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
font-size: 10pt; color: rgb(0, 0, 0);"> </div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
font-style: normal; font-weight: normal;">My 1959 TR3A got hardened valve =
seats as part of its complete restoration two years ago.</span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
font-size: 10pt; color: rgb(0, 0, 0);"> </div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
font-style: normal; font-weight: normal;">Alex Levy</span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
font-style: normal; font-weight: normal;">59 TR3A</span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
font-style: normal; font-weight: normal;">66 TR4A</span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
font-size: 10pt; color: rgb(0, 0, 0);"> </div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
font-size: 10pt; color: rgb(0, 0, 0);"> </div>
<br>In a message dated 10/23/2024 2:10:31 PM Eastern Daylight Time, grglmn@=
gmail.com writes:
<div> </div>
<div class=3D"quotedReply">
<blockquote style=3D"padding-left: 5px; margin-left: 5px; border-left: blue=
2px solid;">
<div id=3D"yiv5020355293">
<div>
<div>I never heard about the adoption of hardened valve seats early on for =
Triumph or other imports. Word on the street in the 80s was we needed=
to get hardened valve seats, find leaded fuel, or run an additive in our f=
uel for our sixties and early seventies cast iron head British cars.&=
nbsp;
<div> </div>
<div>I remember using some kind of lead additive/octane booster in my daily=
drivers at that time, don't know if it made any difference. </d=
iv>
<div> </div>
<div>Since then I have had many hobby cars and many thousands of miles of u=
se with no lead or additives and no problems.</div>
<div> </div>
<div>Greg Lemon</div>
<div>68 TR250</div>
</div>
<br clear=3D"none">
<div class=3D"yiv5020355293gmail_quote">
<div id=3D"yiv5020355293yqtfd11421" class=3D"yiv5020355293yqt1271817098">
<div class=3D"yiv5020355293gmail_attr" dir=3D"ltr">On Wed, Oct 23, 2024, 11=
:36=E2=80=AFAM Don Hiscock <<a href=3D"mailto:don.hiscock@gmail.com"; tar=
get=3D"_blank" rel=3D"nofollow noopener noreferrer" shape=3D"rect">don.hisc=
ock@gmail.com</a>> wrote:</div>
</div>
<blockquote class=3D"yiv5020355293gmail_quote" style=3D"margin: 0 0 0 .8ex;=
border-left: 1px #ccc solid; padding-left: 1ex;">
<div id=3D"yiv5020355293yqtfd47055" class=3D"yiv5020355293yqt1271817098">I&=
rsquo;ve never heard that bit about satellite seats, John, but it’s c=
ertainly possible.
<div> </div>
<div>My recollection is that unleaded fuel first started becoming available=
in America circa 1973-75 and it became dominant in the 1980s. It’s h=
ard to imagine engineering changes by the British motor industry being made=
in the 1960s for unleaded gasoline in the USA. Later on, perhaps. <br=
clear=3D"none"><br clear=3D"none">On Wednesday, October 23, 2024, John Mac=
artney <<a href=3D"mailto:johnbmacartney@gmx.com"; target=3D"_blank" rel=
=3D"nofollow noopener noreferrer" shape=3D"rect">johnbmacartney@gmx.com</a>=
> wrote:<br clear=3D"none">
<blockquote class=3D"yiv5020355293gmail_quote" style=3D"margin: 0 0 0 .8ex;=
border-left: 1px #ccc solid; padding-left: 1ex;">Does anyone out there hav=
e documentary evidence (in the form of Service Bulletins issued by the fact=
ory or Leona NJ) that makes specific mention of the introduction of stellit=
e valve seats in place of earlier and softer alternatives? I do recall BMC =
making something of a hoo-haa about stellite seats being used in the MGB an=
d Healey 3000 back in the sixties. Same applied to Rootes Group and Jaguar.=
<br clear=3D"none">There is hearsay in the UK that hardened seats went into=
heads for the US market at about the same time because of the introduction=
of unleaded fuel. That hearsay also suggests hardened seats were territory=
specific but from an ease of production standpoint, having two different t=
ypes of seat during machining and manufacture just doesn’t make sense=
. I can think of other examples where Standard-Triumph adopted a “one=
type fits all” applied and that goes for other British makes.<br cle=
ar=3D"none">It’s clear that valve seat recession fears in Europe has =
been a kneejerk reaction to a problem that never really existed which sugge=
sts stellite valve seats were fitted for all markets. An engineering or ser=
vice bulletin back in the day would have confirmed this but I never remembe=
r seeing one. Thoughts anyone?<br clear=3D"none"><br clear=3D"none">Jonmac<=
br clear=3D"none">** <a href=3D"mailto:triumphs@autox.team.net"; target=3D"_=
blank" rel=3D"nofollow noopener noreferrer" shape=3D"rect">triumphs@autox.t=
eam.net</a> **<br clear=3D"none"><br clear=3D"none">Donate: <a href=3D"http=
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</blockquote>
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