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Old 01-31-2015, 03:08 PM   #1
carguybill
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Default Removing stuck pistons

I have an 8BA type engine (apparently out of a military vehicle since it has a tag saying it was rebuilt on a military base) and I want to get the block checked for cracks but I have a couple of pistons that have resisted all efforts to be removed. I would be willing to break the pistons to get them out but I would like to salvage the rods and not otherwise damage the block.

I'm looking for good ways to break the pistons without causing other damage.
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Old 01-31-2015, 03:14 PM   #2
Ralph Moore
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Default Re: Removing stuck pistons

Best method guys on the barn hav come up with is probably using a hole saw. Use a short pilot drill so it doesn't hit the rod.then beak out what's left. I use a good piece of hardwood.
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Old 01-31-2015, 04:33 PM   #3
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Default Re: Removing stuck pistons

Try some Coca-Cola a,let it sit a day or 2.
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Old 01-31-2015, 05:47 PM   #4
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Default Re: Removing stuck pistons

Yes, use a hole saw to cut the top off, then be carfull and slot the piston with a saw all. Trying to drivve the oistin can crack a cylinder wall. How do I know that???
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Old 01-31-2015, 09:43 PM   #5
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Default Re: Removing stuck pistons

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Originally Posted by Ol' Ron View Post
Yes, use a hole saw to cut the top off, then be carfull and slot the piston with a saw all. Trying to drivve the oistin can crack a cylinder wall. How do I know that???
X 2 ... And, how do I also know that ???
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Old 02-01-2015, 05:36 AM   #6
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Default Re: Removing stuck pistons

OK, thanks.

I'm trying to visualize the hole saw process. I'm assuming that one would use a hole saw , say 2 1/2" in diameter or so, and cut through the top of the piston and positioned such that the hole saw or guide drill does not hit the rod or the wrist pin. At this point I would then I would have a 2 1/2" hole in the top of the piston through which I would cut with the Saws All out to the piston rings. A couple of such cuts and I would be able to break out a chunk of the piston wall.

Does this sound about right?
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Old 02-01-2015, 07:32 AM   #7
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Default Re: Removing stuck pistons

I have never done that before but I would imagine that I would take some sheet metal and mold it to the shape of the cylinder and put it in the hole to protect the wall. sawzalls can be jumpy and I would not want to mess up the cylinder wall.
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Old 02-01-2015, 08:44 AM   #8
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Default Re: Removing stuck pistons

I never worried about the cyl wall because I would bore to 3 5/16, so a few nics didn't matter. You don't have to cut too far, just a coupla slices around and some 50/50 mix and cross your fingers.
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Old 02-01-2015, 09:22 AM   #9
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Default Re: Removing stuck pistons

If the rod is not connected to the crank, pour some hot kerosene into the bore with the bore setting up straight, wait a couple of days .Using s large block of wood and a heavy hammer start hitting the wooden block. May take a few days but has worked for me.
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Old 02-01-2015, 09:33 AM   #10
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Default Re: Removing stuck pistons

I haven't tried the hole saw trick yet, sounds good though. And I have cracked a cylinder wall when trying to beet out a very stuck piston, block was already scrap due to lots of other cracks so didn't matter, Did surprise me how relatively easy the wall cracked. Will use the hole saw method in the future.
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Old 02-01-2015, 10:25 AM   #11
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Default Re: Removing stuck pistons

I'm hoping too that I haven't cracked a cylinder wall. I have soaked with every conceviable solvent. including Coke, and pushed and pounded. My last attempt was to machine a wooden block which filled the cylinder and pounded on the block with a sledge.

If nothing else, the hole saw technique will be a learning tool and perhaps I will be able to salvage some useful parts. I will photograph the process and, if I ever figure out how to post photographs on this site, will post them.

Thanks to all who responded.
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Old 02-01-2015, 10:31 AM   #12
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Default Re: Removing stuck pistons



Now I've seen it all,makes sense mixture of brake fluid and bbq starter let it burn out and it will free up the piston. Takes a few hours but some swear by it.You could roast wieners while waiting "LOL"

R
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Old 02-01-2015, 12:50 PM   #13
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Default Re: Removing stuck pistons

Quote:
Originally Posted by carguybill View Post
I'm hoping too that I haven't cracked a cylinder wall. I have soaked with every conceviable solvent. including Coke, and pushed and pounded. My last attempt was to machine a wooden block which filled the cylinder and pounded on the block with a sledge.

If nothing else, the hole saw technique will be a learning tool and perhaps I will be able to salvage some useful parts. I will photograph the process and, if I ever figure out how to post photographs on this site, will post them.

Thanks to all who responded.
Sent you a PM
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Old 02-01-2015, 02:51 PM   #14
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Default Re: Removing stuck pistons

A plasma cutter is quick and easy. No collateral damage either.
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Old 02-01-2015, 05:06 PM   #15
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Default Re: Removing stuck pistons

Hot charcoal briquets in the bore is how we free up old one-lungers that have been sunk,
or buried for decades.
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Old 02-01-2015, 05:29 PM   #16
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Default Re: Removing stuck pistons

Quote:
Originally Posted by 32forddump View Post
I have never done that before but I would imagine that I would take some sheet metal and mold it to the shape of the cylinder and put it in the hole to protect the wall. sawzalls can be jumpy and I would not want to mess up the cylinder wall.

Use a long blade and wind a bunch of electrical tape on the ends of the blade, this will keep you from cutting the side of the cylinder wall.

Hole saw: use a smaller hole saw off center, all you have to do is get the sawzall blade through it... Select location so that you can get the blade where you want it...

Karl
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Old 02-01-2015, 06:03 PM   #17
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Default Re: Removing stuck pistons

I have unstuck dozens of motors the way Ronnie shows. Try it. Use a small amount of brake fluid and fill the rest of the way with starter fluid. Let us know how it works
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Old 02-02-2015, 07:57 AM   #18
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Default Re: Removing stuck pistons

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I have unstuck dozens of motors the way Ronnie shows. Try it. Use a small amount of brake fluid and fill the rest of the way with starter fluid. Let us know how it works
I could see how this might work for a single cylinder as shown but I'd be afraid that using this technique for a single cylinder in a V-8 block might crack the block due to differential thermal expansion.
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Old 02-02-2015, 08:51 AM   #19
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Default Re: Removing stuck pistons

I burn one side, four cylinders at once. I can almost set my hand on the block when I do this. It gets about as warm as operating temperature. I have rescued dozens of blocks headed to the scrapper. Look up a post I did in 2012 How to properly warm up a flathead.
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Old 02-02-2015, 01:43 PM   #20
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Default Re: Removing stuck pistons

http://www.fordbarn.com/forum/showth...+up+a+Flathead
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