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DC Frozen Piston

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Al

03-30-2003 15:49:29




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I was given a 1948 DC-3 that had been sitting outside for about 6 years. I was able to remove three of the pistons fairly easily with some very minor help from penetrating oil and a brass bar. Number three had some water in the cylinder and the piston is rusted in. To the point that I cannot get the oil to wick in. If I can get it moving the small amount of rust on the wall should not stop it from coming out.
Any tricks I might try?

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Al

04-06-2003 08:08:52




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 Re: DC Frozen Piston in reply to Al , 03-30-2003 15:49:29  
Success. Tried a number of options. The heat did not seen to work. The piston was at the bottom of the stroke. Added about three inches of alchol. The heat did not migrate downward. The area around the botton of the sleeve/piston was only warm We ended up using a floor jack and a piece of square stock to to put pressure on the piston. To the point of lifting the front of the tractor. Then took a maul and aluminum rod and smacked it upward an inch. That allowed us to swing the crankshaft out of the way. A three inch pipe then pushed it out.
Any good locations to get some after market rings? and gaskets?

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L.Lamp

03-31-2003 23:19:21




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 Re: DC Frozen Piston in reply to Al , 03-30-2003 15:49:29  
I don't think I would put very much pressure on the rod with a jack or a sledge hammer. You could bend a rod or ruin the bearing or both. Those are $90+ connecting rods and you would sure take the fun out of your rebuild if you had to buy a new set. My DC was just as yours is and I chiseled the piston out. I saved the old sleeves and three pistons, but I wanted 4" pistons so I put in a new set of sleeves and aluminum pistons, Case parts. It is a very nice running '51 DC.

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Al

03-31-2003 18:23:13




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 Re: DC Frozen Piston in reply to Al , 03-30-2003 15:49:29  
Casepower- Didn't leave a address- No such luck. The piston is at the bottom of the stroke or very close to it. Got the pan off and but cannot get the connecting rod off the crank. Thinking of dropping the crank a bit, trying the burn and then smack the daylights out of it with a mall and a 4 X 4. The piston is a write off but I could probably save the cylinder. Al



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CASEPOWER

03-31-2003 18:40:57




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 Re: Re: DC Frozen Piston in reply to Al , 03-31-2003 18:23:13  
If the pan is off and the other pistons are out you can put the cap back on and put a jack under the cap and jack it up. It will help as long as the piston is not directly on bottom dead center. I have a steel bed roll back that I put them on and chain them down and then put the jack under them. If you do something like that you can also put one of the pistons that is up back in it with out the rings on it, put a block of oak on it and nail it with a sledge. With the jack pushing up on one and the sledge knocking down on the other it should move.. If you get it up far enough to get the rod off the crank I would still knock it down through to keep from damageing anything.

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CASEPOWER

03-31-2003 07:11:04




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 Re: DC Frozen Piston in reply to Al , 03-30-2003 15:49:29  
If it's not at the bottom of the sleeve and the other three are out you can get the rod off of the crank jounral and knock the piston down through and take it out the bottom. Yes it will fit through the little side cover on the oil pan.



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MGM

03-31-2003 03:20:18




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 Re: DC Frozen Piston in reply to Al , 03-30-2003 15:49:29  
I bought a 930 that had been outside for 5 years, water in the piston area rusted things tight. I pulled the crank so I would not damage it, I soaked each piston with diesel fuel, mystery oil, you name it for over a month, ended up using a 4 by 4 oak block of wood and a maul. And I swung hard and long. Even had to chisel out one piston center so I could break the sides loose, Good luck on breaking yours free
Mike

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Larry

03-30-2003 18:14:53




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 Re: DC Frozen Piston in reply to Al , 03-30-2003 15:49:29  

Try soaking it with denatured alcohol. The alcohol is thinner and will soak in a lot better. You might even try burning it like Mike suggested.



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Mike Schotte

03-30-2003 16:23:40




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 Re: DC Frozen Piston in reply to Al , 03-30-2003 15:49:29  
Hi Al,

I've got a '45 SC parts tractor that I got at a salvage auction. The head had been removed, and there was leaves and dirt in the cylinders when I got it.

I'm trying a trick that I read about on one of the other boards- burning the cylinders.

After cleaning the bores and soaking with diesel for a week or two- I lit the diesel with a propane torch and let it burn down. Supposedly the heat of expansion will break the rust bond between the piston and the sleeve and allow the diesel to penetrate further down.

I rapped each piston with a wooden block and hammer- and added my next soak of diesel while the pistons were still hot.

I've done two burns so far, and things are still soaking.

It's been about a month and a half since I've worked on the tractor... but I'm hoping I'll be able to free the engine up on the next burn. I'll let you know if it works for me.

PISTONS BEFORE-
third party image

SOAKING WITH DIESEL AFTER BURN #1-
third party image

DIESEL BURN #2-
third party image

If this works, then I might try it on my stuck '49 DC-3. Or- since I haven't put oil in the cylinders of this one yet... I might try Evapo-Rust or white vinegar to eat the rust first.

Good Luck! -Schotte

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