On Dec 2, 17:18, Fred Cisin wrote:
> On Tue, 2 Dec 2003 jpero_at_sympatico.ca wrote:
> > While everybody else is talking about cleaning up the leakers,
> > Is this chemical is good use to dissolve rust on steel screw is
> > rust seized in the potmetal or aluminum distributor?
>
[...]
> The more common problem with steel screws into aluminum parts, such
as
> drives, particularly if subjected to weather, etc., is for the head
of the
> screw to rust, but the aluminum hole that it screws into to corrode.
>
> Usually the best approach is to get it out where you can work on it.
> A penetrating oil, OR COKE, if permitted to soak into the hole
overnight
> will sometimes help loosen the grip.
Agreed -- don't use phosphoric acid because iron phosphate will gum up
the hole just as badly as any rust. Penetrating oil (*not* WD40 -- the
stuff we use over here is called PlusGas) is the best thing to try, or
a mineral acid like hydrochloric acid if that fails.
I'll snip the rest of Fred's excellent reply, except:
> Then use tools that fit TIGHTLY to the head of the fastener (use 6
point
> not 12 point for hex), and DON'T use a #1 Phillips for #2 fasteners!
And in the UK/Europe, don't use a Phillips driver on a
Pozidrive/SupaDriv screw, or vice-versa.
--
Pete Peter Turnbull
Network Manager
University of York
Received on Tue Dec 02 2003 - 19:43:14 GMT