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smashing out stuck pistons #2290196
04/18/17 08:01 PM
04/18/17 08:01 PM
Joined: Apr 2005
Posts: 1,107
Lynch Road
mro Offline OP
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Is there a better way of doing this then continually smashing at these ? have to go through the top - the crank is stuck in place.


68 Satellite Wagon and a few other ones
Re: smashing out stuck pistons [Re: mro] #2290203
04/18/17 08:10 PM
04/18/17 08:10 PM
Joined: May 2003
Posts: 96,649
On The Boat, On The Lake, Wa. ...
amxautox Offline
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On The Boat, On The Lake, Wa. ...
What engine?

I don't think pistons can be taken out thru the bottom on very many engines.

Pour some Winter Green on top of the pistons/around the rings, let it soak for a few days, pour in more Winter Green as it might drain away past the rings.

Turn the motor upside down, pour in more Winter Green, let it sit for a few days.

Then pound away from the bottom.


Tom

"Everyone should believe in something; I believe I'll go fishing."

-Henry David Thoreau

Men and fish are alike. They both get into trouble when they open their mouths

author unknown

Re: smashing out stuck pistons [Re: mro] #2290204
04/18/17 08:12 PM
04/18/17 08:12 PM
Joined: Apr 2005
Posts: 1,107
Lynch Road
mro Offline OP
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383 RR 69 - I could swear I took the 392 pistons out through the bottom - it was years ago - I could be wrong


68 Satellite Wagon and a few other ones
Re: smashing out stuck pistons [Re: mro] #2290215
04/18/17 08:25 PM
04/18/17 08:25 PM
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chicagoland,usa
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buildanother Offline
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chicagoland,usa
I only know of a couple of chev engines that only a couple of pistons can come out the bottom, BUT the crankshaft has to be removed beforehand. Soak it bigtime I guess.

Re: smashing out stuck pistons [Re: mro] #2290220
04/18/17 08:30 PM
04/18/17 08:30 PM
Joined: Apr 2005
Posts: 1,107
Lynch Road
mro Offline OP
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Its been soaking in kroil for 7 years....no joke - really. Its the original engine to one of my cars that I am not using - but i'd like to send it out for a rebuild. 7 years of soaking - thats seriously stuck


68 Satellite Wagon and a few other ones
Re: smashing out stuck pistons [Re: mro] #2290227
04/18/17 08:38 PM
04/18/17 08:38 PM
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Lansing, MI
70gtx440dana Offline
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I had to break the pistons out of a 440 that sounds similar to your situation. It takes awhile.......big hammers and chisels. Not fun!!!

Start on the worst looking ones. After you get a couple out you may be able to turn the crank!


70 Road Runner 383-4 4 speed FJ5 & black guts
70 Charger R/T 440-4 4 speed FJ5 & white guts
Re: smashing out stuck pistons [Re: 70gtx440dana] #2290240
04/18/17 09:05 PM
04/18/17 09:05 PM
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Posts: 5,180
upstate western ny
sogtx Offline
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I think pouring molasses in bores will free it up.

Re: smashing out stuck pistons [Re: mro] #2290242
04/18/17 09:08 PM
04/18/17 09:08 PM
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northwest USA
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NANKET Offline
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Molasses eats the rust. Get it at farm supply stores in a big drum, soak the whole block.
The vinegar, salt, and lemon juice mixture eats aluminum so that may be even better in a case like this where the Pistons are junk.
Does pounding the Pistons to death cause any damage to the cylinder walls or block?

Re: smashing out stuck pistons [Re: 70gtx440dana] #2290249
04/18/17 09:11 PM
04/18/17 09:11 PM
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Florida
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I'm going through the same thing right now, motor has been sitting since 1976 but is the matching numbers block to my car. I have had it soaking for over 4 months and no luck. we decided this weekend they are coming out one way or another, drilling, chiseling, or what ever it takes. I have to get started on my motor. sawzall

Re: smashing out stuck pistons [Re: mro] #2290257
04/18/17 09:24 PM
04/18/17 09:24 PM
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Oregon
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AndyF Offline
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Oregon
Knock them out from below using a long rod or pipe. Just get the pipe pushing against the bottom of the piston crown and then pop it hard with a 5 lb sledge and the piston top will break off. Only takes a couple of seconds once you get the hang of it.

Re: smashing out stuck pistons [Re: AndyF] #2290301
04/18/17 10:35 PM
04/18/17 10:35 PM
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Posts: 257
Alberta
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440_Offroader Offline
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Alberta
Throw the block in a hot tank... All the aluminum will mysteriously disappear! Haha!!

Re: smashing out stuck pistons [Re: 440_Offroader] #2290314
04/18/17 10:58 PM
04/18/17 10:58 PM
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Posts: 1,073
st.cloud fl
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soak in transmission fluid beat out with wood hammer handle

Re: smashing out stuck pistons [Re: mro] #2290333
04/18/17 11:46 PM
04/18/17 11:46 PM
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Florida
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Drill multiple large holes in the pistons to make it easy to bust them out. Once they are out you can concentrate on the crank.


Careful, your character's showing!
Re: smashing out stuck pistons [Re: mro] #2290367
04/19/17 12:50 AM
04/19/17 12:50 AM
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Porter67 Offline
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If you have to break them out, riddle them with holes with a drill to lesson the forces on the cylinder walls and make it over all easier.

Re: smashing out stuck pistons [Re: mro] #2290368
04/19/17 12:50 AM
04/19/17 12:50 AM
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Dang, got me by a few seconds...

Re: smashing out stuck pistons [Re: mro] #2290390
04/19/17 01:43 AM
04/19/17 01:43 AM
Joined: Apr 2006
Posts: 4,220
West Plains, MO
DrCharles Offline
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I've never tried it and don't know how safe it is, but what about melting the center of the piston with a torch? weld

The heating and cooling should break the rust even if the whole piston doesn't trickle out... work

Re: smashing out stuck pistons [Re: mro] #2290425
04/19/17 05:05 AM
04/19/17 05:05 AM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:
Its the original engine to one of my cars. 7 years of soaking - thats seriously stuck
Just me I would not want to chance cracking a cyl wall so I would go to town with a drill as to not risk any cyl wall damage. But I ain't been in that position so jmnho.


live every 24 hour block of time like it's your last day on earth
Re: smashing out stuck pistons [Re: mro] #2290447
04/19/17 08:36 AM
04/19/17 08:36 AM
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Posts: 1,287
New Jersey
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Powerflow Offline
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Do you have a way of heating the block (like in an oven)? The expansion and contraction may loosen things up. Just make sure there are no flammable liquids still in the block.

Re: smashing out stuck pistons [Re: mro] #2290448
04/19/17 08:51 AM
04/19/17 08:51 AM
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jersey
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Spaceman Spiff Offline
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If your going to send it out to be rebuilt, why not have the machine shop do it? Yes it will cost money, but it may be better than damaging it trying to get them out yourself.


526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
Re: smashing out stuck pistons [Re: mro] #2290452
04/19/17 09:03 AM
04/19/17 09:03 AM
Joined: Mar 2005
Posts: 1,406
New Jersey, USA
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yella71 Offline
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Drop the wrench and step away from the engine... sorry but from what I am reading you have NO idea what you are doing.


71 challenger convertable, 64 sport fury 383 ci with factory air 99 sebring convertable 89 CTD pup
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