Richard, the process is called hard anodising. One uses either sulphuric
acid or chromic acid and applies a direct current with the object as anode.
An oxide layer is formed - with hard anodising the thickness is between 25
and 50 micron. A red blood cell is approx. 8 micron in diameter, a strand of
human hair approx 100 micron. Therefore you better don't hone an anodised
cylinder!
Regards,
Jack Aeckerlin, The Netherlands
1964 BJ8 29432
2010/9/3 richard mayor <mayorrichard@hotmail.com>
> I have a question about the "specially treated hardened interior surface"
> of
> the slave cylinder. Is there a source out there that explains this in
> greater
> detail? I always assumed that the aluminum was the same
> alloy/quality/hardness
> throughout. Inquiring minds want to know.
> Thanks,
>
> Richard Mayor
> BN7L-466 Vintage Racer
> Portland, Oregon
>
>
>
>
> > Date: Tue, 31 Aug 2010 11:14:50 +0800
> > From: healey.nut@gmail.com
> > To: CAWS52803@aol.com
> > CC: healeys@autox.team.net
> > Subject: Re: [Healeys] Clutch question
> >
> > Rudy -
> >
> > You can't hone the slave cylinder - it is aluminum with a specially
> treated
> > hardened interior surface. If you hone it, it will only last for a few
> > months.
> >
> > If the interior surface is worn, the only solution is either to get a new
> > slave cylinder or have your old one sleeved with a Stainless Steel
> insert.
> >
> > Did you try bleeding the slave cylinder?
> >
> > I find just getting a new slave cylinder and putting it on is the best
> and
> > easiest way to go. And not too expensive.
> >
> > Alan
> >
> > On Tue, Aug 31, 2010 at 10:29 AM, <CAWS52803@aol.com> wrote:
> >
> > > I have no clutch! The pedal goes to the metal!
> > > If I pump it 5 - 10 times, I might be able to shift it into gear. I'm
> not
> > > losing any fluid. Oh yes, it's a BN4 with separate clutch & brake
> fluid
> > > cylinders.
> > > I am going to remove, hone and replace the inner seals.
> > > My question - Is this something I should undertake myself? I do have
> the
> > > parts list and owners manuals for a guide.
> > > Any suggestions or help?
> > _______________________________________________
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