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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 -----=20
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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<DIV><FONT size=3D2>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". When I changed the heads that did not fit =
either,=20
but a 3/8" drive socket did at 1.070".</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Be very careful tightening them, after decades =
of doing=20
plugs in cast-iron heads I loosened and tightened the same way, and =
after many=20
years and tens of thousands of miles stripped a thread. 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. Another issue is said to be =
differential=20
expansion, another recommendation is to only remove them fully cold or =
fully=20
hot, not part warm. Another consideration is applying =
anti-seize to=20
the threads - some recommend it, but only if the plug body is black or =
plain=20
steel. If applied to pre-coated or nickel-alloy bodied plugs the =
torque=20
should be reduced by 30%-40%.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<BLOCKQUOTE=20
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=3D2></FONT><FONT size=3D2></FONT><BR></DIV>I tried to =
install new=20
plugs in my 1969 MGB GT today. I was not successful. I don't =
know what=20
genius designed the aluminum head, but a normal spark plug socket for =
a 14mm=20
spark plug does not go all the way dow to fully engage the=20
head.</BLOCKQUOTE></BODY></HTML>
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