Do you see any aluminum smearing on the cylinder walls below the pistons?
If not, I suggest the following:
What I have done in the past is, with the head off and the rods separated
from and clear of the crank, soak the tops of the pistons with the solvent
of your choice. I prefer Kroil, covered, so it does not evaporate. Let
this sit for a week or so, and then try tapping them down with a piece of
wood. Try to cover the entire top of the piston with the wood and gently,
but persistently tap it downward. Do not try to twist the pistons, as the
bore and piston may be egged slightly.
Jack
-----Original Message-----
From: shop-talk-bounces@autox.team.net
[mailto:shop-talk-bounces@autox.team.net] On Behalf Of BJNoSHOV8
Sent: Sunday, April 17, 2011 1:03 PM
To: shop-talk@autox.team.net
Subject: [Shop-talk] how to loosen stuck pistons?
I've got an engine that's frozen (stuck). My theory is that they ran it
without oil. The bearings don't look bad but the small ends of the rods
look like they got hot. I need to get the pistons knocked out.
With the engine in the car I pulled the head off and soaked the tops of
the pistons in PB Blaster, but it didn't seem to help. but then that
is trying to rotate all 4 pistons at one time. I pulled the engine out,
pulled off the pan, and tried to knock the pistons out one at a time. I
couldn't get them to move.
I've finally decided that the PB Blaster might go beside the pistons but
maybe it couldn't get by the rings. So I can try soaking the pistons
from the bottom. Someone told me to soak the cylinders in diesel. I'm
wondering if there is anything that would be better, such as ATF (I've
got some extra ATF). I can set the engine upside down and fill the
bottom half of the cylinder and let it set for awhile.
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