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Always excellent advice for all of us, Paul. Thank you.
Rick
On Tue, Jan 19, 2021, 4:59 AM PaulHunt73 <paulhunt73@virginmedia.com> wrote:
> I had the same problem with the V8 (aluminium heads) using the one from a
> 1/2" drive socket set which measured 1.1" OD, but did have one that fitted
> at 1.087". When I changed the heads that did not fit either, but a 3/8"
> drive socket did at 1.070".
>
> Be very careful tightening them, after decades of doing plugs in cast-iron
> heads I loosened and tightened the same way, and after many years and tens
> of thousands of miles stripped a thread. Repaired that but subsequently
> stripped another, hence changing the heads and a lot more circumspect about
> tightening - reputedly 15-22 ft lb for gasket seal plugs as opposed to 26
> to 30 in cast iron. Another issue is said to be differential expansion,
> another recommendation is to only remove them fully cold or fully hot, not
> part warm. Another consideration is applying anti-seize to the threads -
> some recommend it, but only if the plug body is black or plain steel. If
> applied to pre-coated or nickel-alloy bodied plugs the torque should be
> reduced by 30%-40%.
>
> PaulH.
>
>
>
> ----- Original Message -----
>
> I tried to install new plugs in my 1969 MGB GT today. I was not
> successful. I don't know what genius designed the aluminum head, but a
> normal spark plug socket for a 14mm spark plug does not go all the way dow
> to fully engage the head.
>
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>
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<div dir=3D"auto">Always excellent advice for all of us, Paul. Thank you.<d=
iv dir=3D"auto"><br></div><div dir=3D"auto">Rick</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jan 19, 2021=
, 4:59 AM PaulHunt73 <<a href=3D"mailto:paulhunt73@virginmedia.com";>paul=
hunt73@virginmedia.com</a>> wrote:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x"><u></u>
<div bgcolor=3D"#ffffff">
<div><font size=3D"2">I had the same problem with the V8 (aluminium heads) =
using the=20
one from a 1/2" drive socket set which measured 1.1" OD, but did =
have one that=20
fitted at 1.087".=C2=A0 When=C2=A0I changed the heads that did not fit=
either,=20
but a 3/8" drive socket did at 1.070".</font></div>
<div><font size=3D"2"></font>=C2=A0</div>
<div><font size=3D"2">Be very careful tightening them, after=C2=A0decades o=
f doing=20
plugs in cast-iron heads I loosened and tightened the same way, and after m=
any=20
years and tens of thousands of miles stripped a thread.=C2=A0 Repaired that=
but=20
subsequently stripped another, hence changing the heads and a lot more=20
circumspect about tightening - reputedly 15-22 ft lb for gasket seal plugs =
as=20
opposed to 26 to 30 in cast iron.=C2=A0 Another issue is said to be differe=
ntial=20
expansion, another recommendation is to only remove them fully cold or full=
y=20
hot, not part warm.=C2=A0 Another consideration is=C2=A0applying anti-seize=
to=20
the threads - some recommend it, but only if the plug body is black or plai=
n=20
steel.=C2=A0 If applied to pre-coated or nickel-alloy bodied plugs the torq=
ue=20
should be reduced by 30%-40%.</font></div>
<div><font size=3D"2"></font>=C2=A0</div>
<div><font size=3D"2">PaulH.</font></div>
<div><font size=3D"2"></font>=C2=A0</div>
<div><font size=3D"2"></font>=C2=A0</div>
<blockquote style=3D"BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING=
-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px">
<div style=3D"FONT:10pt arial">----- Original Message ----- </div>
<div><font size=3D"2"></font><font size=3D"2"></font><br></div>I tried to=
install new=20
plugs in my 1969 MGB GT today. I was not successful.=C2=A0 I don't kn=
ow what=20
genius designed the aluminum head, but a normal spark plug socket for a 1=
4mm=20
spark plug does not go all the way dow to fully engage the=20
head.</blockquote></div>
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</blockquote></div>
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