[xk-engine] Removing a broken fastener from Aluminum

XK-Engine
#1

See http://www.jag-lovers.org/v.htm?id=1380816154 for a short
explanation of how to dissolve a broken screw out of an Al Casting
using Alum.

Andrew–
1968 3.8S
Zurich, Switzerland
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#2

In reply to a message from JagWaugh sent Thu 3 Oct 2013:

Very interesting indeed, Andrew . I never knew that Alum would
dissolve iron–
christopher storey
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#3

In reply to a message from christopher storey sent Fri 4 Oct 2013:

Christopher,
I first came across it in clock and watch repair… The Alum
will only attack Ferrous materials, and leaves Brass/Copper/Al
intact.
With a clock plate it goes a LOT faster, a couple hours will
dissolve a 1mm screw out of a 2mm plate. Also, Brass doesn’t get as
badly discolored, and is easier to clean up with chemistry. (Short
of concentrated Nitric or Sulphuric Acids I tried a large range of
acids and bases to see if I could shift the smut, but nothing
really touched it.)

Andrew–
The original message included these comments:

Very interesting indeed, Andrew . I never knew that Alum would
dissolve iron

–
1968 3.8S
Zurich, Switzerland
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

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#4

In reply to a message from JagWaugh sent Sat 5 Oct 2013:

A lister contacted me offline asking which form of Alum (there are
3 different forms). The stuff I used was Potassium Aluminum
Sulfate: KAl(SO4)2 aka as ‘‘Potash Alum’’, available here at most
chemists (about 10$ for 200g).

Andrew–
The original message included these comments:

I first came across it in clock and watch repair... The Alum

will only attack Ferrous materials, and leaves Brass/Copper/Al

–
1968 3.8S
Zurich, Switzerland
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

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#5

Tounge in check here but;
Probably not a good idea to use the wifes good stainless steel pots to do
small items with ya think??? :slight_smile:
Regards Robin O’Connor
'92 XJ40 4.0 Ltr
'75 XJ6L
'66 ‘S’'Type 3.8 MoD
Auckland NZ----- Original Message -----
From: “JagWaugh” andrew.waugh@bluewin.ch
To: xk-engine@jag-lovers.org

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