I'm not sure i understand your question Kevin!

What do you mean by "Seal at the top of pistons"?

In that picture:
http://www.benplace.com/amc_head/amc9.jpg

You see everything that goes there, at top of piston, there is nothing, but
on the head side (well, it will end up in between the top of pistons and the
head), you have a metal o-ring head gasket. The Wasser engine as 2 separate
gasket, the inner metal one that sealed the compression and the outter big
black rubber one that sealed the coolant from going out of the engine.
http://www.benplace.com/amc_head/amc8.jpg

Maybe, what you mean is that o-ring on top-side of the sleeve:
http://www.benplace.com/bjp_head2/100_0043.jpg

This one stop the coolant from going into the combustion chamber.

There is also another one at the lower part of that sleeve:
http://www.benplace.com/bjp_head2/100_0042.jpg

If there is no crack on heads and if it's properly seal, your overheating
problems comme from elsewhere.

I hope that help.

Ben

On Wed, 2 May 2007 18:22:33 -0700, kevin obrien <kevindobrien@YAHOO.COM> wrote:

>Hello All:
>
>A few years back my 1990 Carat had overheating
>problems. I came across a deal on a rebuilt 2.1 engine
>and had it installed...and stored the overheating one.
>
>I need to put the old engine back into service (it has
>about 50k on it) and I'm looking at having the heads
>and gaskets replaced...hoping this fixes the
>overheating I was experiencing awhile ago.
>
>My question is...Are there any seals at the top of the
>pistons...or anything else that should be
>checked/replaced while I'm having the heads done that
>could have added to the overheating problem?
>
>Suggestions  appreciated....
>
>Cheers!
>Kevin
>
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