There may be something better, but you can generally find Champion
spark plug thread lubricant at auto parts stores. This "lubricant"
is considered suitable where torque values are important (e.g. aviation
engines). The actual lubrication is provided by mica particles in
suspension. Even if all lubricating oils are baked out, there is
sufficient mica trapped in the threads to allow the (sparkplug, nut,
stud...) to be removed, because the mica particles shear and release
some of the frictional binding. N.B. you don't want graphite, which
at exhaust temperatures will tend to cook into iron, causing some
embrittlement of exhaust fasteners. In other words, lubricant specs
for exhaust manifold threads is more critical than intake manifolds
and you really need to use the recommended antiseize compound based
not only on expected temperatures but the alloys, fastener size and
torque, etc. that presumably the engineers have carefully considered
for the application. (On the otherhand, I have been known to use
high-temperature RTV as a "thread lubricant" to secure catalytic
converters because the temperatures reached caused erosion and
molecular binding of nuts to the studs. The high-temp RTV seems to
prevent that, and even keeps exposed threads that protrude beyond
the nut from degrading; the threads "clean" themselves on removal
of the nut.)
-lar
"We, too, who look upon the loom are deafened; and only when we escape it
shall we hear the thousand voices that speak through it.... Ah, mortal!
then, be heedful; for so, in all this din of the great world's loom, thy
subtlest thinkings may be overheard afar." - Herman Melville, _Moby Dick_
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