Paul,
I've read in some texts, very old ones, though, that one should place
a section of ring on top of piston before scraping, then scrape to the
ring. It was not written, however, if that was to provide protection of
cylinder wall from the scraper, or if it was to preserve the ring of
carbon around the outer edge of the piston.
I agree that there seems to be no reason to leave the ring of carbon,
but have read to do so in a number of sources. Perhaps it was a practice
in USA years ago.
Bob
On Mon, 18 Feb 2008 08:37:19 -0000 "Paul Hunt"
<paul.hunt1@blueyonder.co.uk> writes:
> The broken piston ring is to clean the ring grooves in the piston,
> not leave
> a ring around the crown.
>
> PaulH.
>
> ----- Original Message -----
> >A broken piston ring was recommended to me for use as a scraper in
> this
> > situation
> >
> >>> removing carbon
> >>> ...it is best to leave a ring of carbon round the
> >>> outer edge of the piston.
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