As said, a small screw driver applied to the ring gap should pop them
out. But, rings are not reuseable. More importantly, if the cylinders
overheated, it is likely that the ring lands in the pistons are damaged
beyond use as well. After the pistons are cleaned thoroughly, with a
feeler gauge you can measure ring to land clearance by putting a proper
ring in each land and measure the clearance with a feeler gauge.
Hopefully you can find the specs for this somewhere. Also, you should
check the cylinder barrels with a dial indicator for out of round.
Scoring can be felt with you nails, but a dial indicator will give
better results. Numbers don't lie. If you get much variation at all,
it's time for new pistons and jugs. That's just the way it is sometimes.

John

John Rodgers
Clayartist and Moldmaker
88'GL VW Bus Driver
Chelsea, AL
Http://www.moldhaus.com

On 5/26/2011 9:03 PM, HotelWestfalia wrote:
> Hi to all,
> I have the four pistons out and would like to free the rings from all the four of them out.  They are all cooked in solid from overheating.  I don't know a sure way of getting them free again.  Would it be some kind of boiling them in something for a few hours?
> Anyone knows this?
> Best wishes,
> Zoltan
>
>