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Allis Chalmers Discussion Forum
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Freeing up a WD engine

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kwahl1

05-15-2006 21:31:34




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Got a stuck WD that I have been soaking for two months trying to break the pistons free. I decided to tow it around the yard twice with my truck. The tractor was in 4th gear. No luck. I guess the clutch slips too? I am reluctant to pull the engine out as its in a tough spot. Will I be able to unbolt the pistons from the crank and pop them through the top, then hone em out a bit, all without taking the engine out completely? I"ve got the head off and the crank exposed

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kingmondo

05-18-2006 14:54:49




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 Re: Freeing up a WD engine in reply to kwahl1, 05-15-2006 21:31:34  
Here are three other things I have used to free up pistons. apple cider vinegar, fingernail polish remover, and seafoam. the first two are acidic. I bought a tractor that someone tried to free up by pulling it and pieces of the one piston were in the oil pan.



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Texas Denny

05-16-2006 06:58:20




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 Re: Freeing up a WD engine in reply to kwahl1, 05-15-2006 21:31:34  
I wouldn't pound on the top of the pistons. If you do it too much and too hard, you can break the sleeve. I know because I've done it. I've spent months doing this same thing you're doing. On one, I finally pulled the engine and put it in a hydraulic press to push out the piston. Chances are that the clinders are going to need some honing at a minimum. Trying to fix without pulling makes job a lot tougher.

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Jerry Coulter

05-16-2006 06:57:23




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 Re: Freeing up a WD engine in reply to kwahl1, 05-15-2006 21:31:34  
Unless you clamp down the sleeves some way, they will come out with the pistons.



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old

05-16-2006 06:17:30




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 Re: Freeing up a WD engine in reply to kwahl1, 05-15-2006 21:31:34  
Well since you have the head off this is what I would do. Blow out what ever you have in the cylinders, then almost fill the cylinders with tranny fluid. Then let it sit a day or so. Then the next day put about a tablespoon of gas in each cylinder and carefully light it up and let it burn. What that does is heats up the block but not the pistons. Most of the time doing that will brake it free. Also useing the starter to turn the engine over works better the tring to pull it.

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J Black

05-17-2006 04:07:30




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 Re: Freeing up a WD engine in reply to old, 05-16-2006 06:17:30  
I bought a WD at an auction that was stuck.We towed it home behind a pickup, and I tried all the way home for approximately fifteen miles to get it to turn over without success.Pulled the plugs and put several cans of liquid wrench in the sparkplug holes and let it sit for a week.I stood on the crank until it bent, but still no success.I made a mixture of real turpentine, acetone and brake fluid and added that to the cylinders after using air to vacate the liquid wrench.Let it sit another week, and it still wouldn't turn.Pulled the head and tapped the highest piston with a block of two by four and a 8oz ball peen.The piston moved with the first tap, even though I couldn't get it to move with the crank.I honed each cylinder, washed the walls with mechanics hand soap and wiped the cylinders.Put a new head gasket on and fired her up.That was about seven years ago,and she still runs like a top.The mixture that was in the cylinders had softened the carbon so much that you could wipe it out with a rag.Maybe you will be as lucky.

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