[Mgs] Spark Plug Socket

[Richard Lindsay]

Always excellent advice for all of us, Paul. Thank you.

Rick

On Tue, Jan 19, 2021, 4:59 AM PaulHunt73 <paulhunt73 at 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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