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Seized piston

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John P. Martine

12-04-2002 13:21:42




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Heads Up! I'm 1st timer. I need some advise on how to remove seized piston in my '39 Allis B. I have the engine cylinders exposed. Used almost a full pint of WD-40. Tapped top of piston with wooden block and hammer. Need pointer! This is my 1st restoration project. I don't want it to be a long process. Too many other things going on in my life these days. --JPM.




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Adam Bronson

12-04-2002 19:48:05




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 Re: seized piston in reply to John P. Martine, 12-04-2002 13:21:42  
Use JB 80 it is a lot better that WD 40, soke for week or two, hit with a block of wood (Oak works best this helps if it fits the hole fairly tight) then put it in gear and rock it or turn the ring gear with a bar if it has one. If the head is still on soke and then put hydrolic presure to it useing the spark plug holes with another tractor. But be warned DO THIS OUTSIDE if it comes loose you will have oil everywhere.

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fox

12-05-2002 05:59:25




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 Re: Re: seized piston in reply to Adam Bronson, 12-04-2002 19:48:05  
If you want to try reusing the piston, stop, don't beat on it. Hook your water heater to the block and get it hot . Let it soak for a few days first, with diesel fuel then put a few drops of gas in with the diesel and light it. Let it burn out and I bet the piston will move.
Make sure other pistons are not frozen in place also. This is why beating on it is bad. It trys to move the crank and other pistons when striking it with a hammer.

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Keith

12-04-2002 17:47:08




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 Re: seized piston in reply to John P. Martine, 12-04-2002 13:21:42  
I am restoring a WC and ran into the same problem with frozen pistons. After removing the crank I had a little success with filling the cilinders with diesel fuel and lighting them on fire. This heats the sleeve while keeping the piston cool after the fire burned out I took a block of wood and a big hammer and gave them some good hard blows. I was able to get one piston out this way and all of the rest of the sleeve assemblies came out very easy. Good luck

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Gordon in IN

12-04-2002 16:39:07




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 Re: seized piston in reply to John P. Martine, 12-04-2002 13:21:42  
If all else fails, remove the piston, rod, piston pin and cylinder sleeve together as an assembly. I have had good luck doing this in the tractor using a Hyd. Jack to "push the piston and cylinder up" while using a piece of hardwood and a "large" hammer to "encourage" the process. The large hammer should only be used to "bump" the assembly not "drive" it out. Once the assembly is out you can try heating the sleeve while cooling the piston. As a last resourt, and realizing that you will need to replace at least a sleeve, you can grind a notch down opposite sides of the sleeve and then split the sleeve with a cold chisle and hammer. If done carefully this will not damage the piston or other parts. Let us know how you make out with this effort. Gordon

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Justin NY

12-04-2002 16:32:38




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 Re: seized piston in reply to John P. Martine, 12-04-2002 13:21:42  
John, I found a mixture of kerosene and marvel mystery oil works well( about 1/2 +1/2)If the cylinder walls are rusty clean them up with some sand cloth try knocking piston down first and then sand.I have heated the pistons also with a torch sometimes that helps.If you have electric start use the starter to try to turn it with a good Battery.if sleeves are useable make sure your head is on when trying to free it otherwise ya might pop the sleeves out,If all else fails you will have to knock them out through the bottom.Good Luck and Welcome Aboard Justin NY

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Gordon in IN

12-04-2002 16:47:28




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 Re: Re: seized piston in reply to Justin NY, 12-04-2002 16:32:38  
Justin, I do not think that it is possible to remove the pistons in a WC out of the bottom of the sleeves with the sleeves in the engine. I do not think that there is enough clearance. I think that this can be done in some engines, such as the AC "G" (Contenental Engine) but not in the AC WC engine. There is also a risk of cracking the sleeve if the corroded piston is driven out the bottom of a rusty sleeve. Just my opinion, Gordon

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bluejay2002

12-05-2002 07:13:17




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 Re: Re: Re: seized piston in reply to Gordon in IN , 12-04-2002 16:47:28  
Now this is a pretty crazy idea but i've seen it work. Pour some coke down the cylinder on top of the seized piston. let is sit for a while and it should come right out. ive seen it done on an old chrysler engine that was stuck and it worked out fine.



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