On Thu, 2 Oct 2008 06:19:00 -0700, "Stupendous Man"
wrote:

Having taken apart many engines that have sat for 70 years or longer, I have
had good success with Coca-Cola. Sometimes it takes a week or even a month
with Knight type sleeve valve engines that have iron pistons installed with
.0015 clearance.

Its got a half can of Kroil sitting in it, with periodic bashings
using a 1x1 and a hammer, around the edges of the piston.