I have dealt with a few stuck engines before, and I believe it
matters how or why the piston is stuck. Some of my experience was
with early inboard-outboard boat motors, they tended to stick from
salt induced corrosion build up between the rings and the piston
causing a mechanical bind. Usually I found the cylinder wall in good
condition once the piston was freed. If the piston is stuck from the
rings corroding to the cylinder wall, in my experience, that cylinder
will need a re-bore due to pitting. If that is the case, usually
breaking the piston to get it out is a time saver, since it won't be
reused. I have heard from some old-timers a long time ago (so old
they are probably gone by now) that cleaning all the grease out of
the bore and pouring vinegar in will loosen the piston. Never tried
it. Good luck.
Bill Huff
At 9/6/200610:42 PM, Thomas Miller wrote:
>Howdy Folks.
>
>I'm currently disassembilng for rebuild a 392 cu.in. FirePower
>engine that has one stuck piston. Upon removing the heads of this
>engine, I found 7 cylinders full of oily, sludgy goop. One cylinder
>was dry and corroded and stuck. This engine has been sitting for
>quite some time with a large dose of water in its crankcase. I
>surmise that along the way as this car sat for many years, someone
>just took the garden hose, stuck it in the oil filler and filled it
>up (the transmission was also full of clear water along with
>ATF....). Upon, pulling the oilpan drainplug, I got about a gallon
>of straight clear water, then a healthy dose of the same oily,
>sludgy goop that sort of just glugged its way out of the pan. I'm
>certain that the water I mention here is NOT from a leak or crack
>between the oiling and cooling systems of the block, since the
>cooling system was quite dry when I got this car, and the radiator
>was quite full of rusty scale etc. as you would expect from a
cooling system
>Anyway, with the events leading up to now, I'm wondering if the
>minds gathered here would share any successful receipies for
>unticking the lone stuck piston here. I've removed the rod bearing
>cap for the stuck piston, and the rest of the rotating assembly
>turns just fine. I'm just "stuck" with this one stuck piston. I'm
>trying to be careful how I go about this as the other 7 cylinders
>exhibit practically NO ridge at the tops of the cylinder walls. If I
>can get away with not having to bore this block and replace the
>pistons, I'd like too. I've been constantly soaking the stuck
>cylinder with penetrating oil, but can't get a whole lot of it on
>top of the piston as it's stuck right at top dead center of it's
>stroke. I've been after it for a couple of days now, alternating a
>good soaking of penetrant and then giving it a good WHACK with a
>mallet via a pice of scrap 2 x 4 on it's top.
>
>So, with all that said, what's worked well for unsticking stuck
pistons?!
>
>Thanks in advance.
>
>Sign me, "Stuck in Columbus" (sorry, I couldn't resist....)
>
>Best Regards,
>
>Thomas F. Miller
><mailto:tfm%40zippynet.com>tfm@xxxxxxxxxxxx
>'57 300C, '57 New Yorker T&C Wagon(s)
>
>
[Non-text portions of this message have been removed]
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