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[Shop-talk] how to loosen stuck pistons?

Subject: [Shop-talk] how to loosen stuck pistons?
From: pat at hornesystemstx.com (Pat Horne)
Date: Sun, 17 Apr 2011 15:17:06 -0500
References: <006801cbfc49$d8e17ee0$8aa47ca0$@cablespeed.com> <6.2.5.6.1.20110416120300.04e0bb20@cox.net> <008401cbfc56$4dcc9030$e965b090$@cablespeed.com> <6.2.5.6.1.20110416155842.04c579f0@cox.net> <00a501cbfc99$21bb7400$65325c00$@cablespeed.com> <6.2.5.6.1.20110417093246.04b760c8@cox.net> <4DAB475E.5030106@tx.rr.com>
If PB blaster from the top and bottom doesn't loosen the piston, and you 
think the rings are what is holding the pistons from moving, try 
rotating the pistons in the bores. If the rings are stuck you should be 
able to get some rotation. if not it is time to go for a press to push 
the pistons down. It may be something that will need to be done by a 
machine shop, or you get to buy another tool!

Peace,
Pat

Thusly spake BJNoSHOV8, On 4/17/2011 3:02 PM:
> 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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-- 
Pat Horne, Owner, Horne Systems
(512) 797-7501 Voice            5026 FM 2001
Pat at HorneSystemsTx.com       Lockhart, TX 78644-4443
www.hornesystemstx.com
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