[Vwdiesel] Bead blasting pistons

[Shawn Wright]

On 11 Jun 2004 at 19:30, Roger Brown <r.c.brown at ieee.org> wrote:

> Shawn Wright wrote:
> > 
> > I've spent a fair bit of time trying to clean my TD pistons by hand, by
> > soaking in laquer thinner, and using a broken ring. I now have significantly
> > less skin on fingers (they are *sharp*), and a long way to go. I've been
> > quoted $40 to bead blast them. I forgot to ask if this will remove all the
> > carbon from in the ring grooves, does anyone know? I'm getting a little
> > worried about damaging the edges of the grooves during the cleaner, so was
> > thinking bead blasting might be a safer way, especially with these expensive
> > TD pistons...
> 
> One thing I found that worked surpisingly well on my Toyota pistons was WD-40. 
> Spray it on, let it sit a few hours or even overnight and it'll bubble up the
> carbon deposits like paint stripper does with paint.  I found this by accident,
> after having sprayed some into the cylinder bores to prevent rust.  Looked in
> the next day and found the carbon deposits peeling off.  Did not have the
> pistons out of the block, so don't know how it would do on the grooves.

I'll give this a try, but am not hopeful.. the carbon on the tops came off with laquer 
thinner easily, but the ring grooves are like diamond... I'll report back how it works. 
Thanks.--
Shawn Wright
http://Zuiko.sls.bc.ca/swright
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