John -
I have the manifolds from two A90s and my 100, the bell crank pivot is
likely carbon steel / bolt steel of some sort.
All of the ones I've had are corroded and needed replacement. Usually the
corrosion is around the bolt head and threads, not the pivot.
All the pivots themselves were very clean without corrosion, I suspect that
the bell crank uses a brass bush of some sort and the brass probably works
its way into the pivot's surface over time, hence the lack of corrosion.
The replacement pivots you can buy are black coated like a typical British
made bolt, so standard grade 5 bolt steel is probably what it is.
Alan
'52 A90
'53 BN1
'59 Jag Mk IX
'64 BJ8
On Sat, Oct 31, 2009 at 9:02 PM, John Harper <ah@jharper.demon.co.uk> wrote:
>
> Alan
>
> If they are not stainless steel then the metal must be something very
> similar. I have just checked four spare manifolds; a couple from Atlantics
> but you will know that they are the same. All are originals and must be
> around 55 years old. None show any significant corrosion and are still
> bright and shiny if lightly polished.
>
> If they are not stainless steel then what is the metal likely to be?
>
> If vendors are selling pivots made of mild steel then they are in my view
> selling an inferior product.
>
> Regards
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