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Allis Chalmers Discussion Forum
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stuck engine

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wayne zoellner

11-27-2005 04:26:38




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I have a 1946 allis b with a stuck engine .What is the best way to get it loose and what is the best stuff to put in the cylinders to loosen it up? thanks wayne




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Mike Raby

05-29-2006 08:25:23




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 Re: stuck engine in reply to wayne zoellner, 11-27-2005 04:26:38  
About the best products out there for this is Kroil by Kano Labs or Knocker-loose by CRC products. Soak them down and let them sit about 4 days. Hope that helps. Mikey from Emsea Motorsports.



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hsdukghl;igha

11-27-2005 12:32:17




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 Re: stuck engine in reply to wayne zoellner, 11-27-2005 04:26:38  
heck all i did w/my tractor was put some peneterating oil on the pistions let it sit for a week or 2 and then she was all freed up if that doesnt work try tapping litely on the pistions. thanks, John



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Zonie

11-27-2005 11:20:57




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 Re: stuck engine in reply to wayne zoellner, 11-27-2005 04:26:38  
I've used PB Blaster with good results. But I do recomend that you at the very least pull the head and check out the valves and see if the sleeves are going to be in good enough shape to try to reuse.
I pull out all the vavles and clean them up and clean up the valve seats. Then if they look like they aren't too pitted I get valve lapping compound and lap the valves so they will seal.
I also take a cylinder hone and hone the cylinders to remove the rust as much as possible befor trying to turn the engine over.
After cleaning up the cylinders I soak the cylinders with PB Blaster and gently try to rotate the crankshaft if it doesn't move easily I take a large block of wood and a hand sledge and hit the top of the pistons with the wood, not too hard, you don't want to do damage to the pistons or rods. IF it starts to move keep putting oil in the cylinders and rock the crankshaft back and forth until you get 2 cylinders to the bottom of the stroke and use the cylinder hone again to clean up the rust again.Then rotate the crank again till the other 2 cylinders are at the bottom of their stroke and repeat the honing.
Make sure to get all of the dirt, rust and abrasive from the hone out of the cylinders. I do this by using a clean rag and pouring a bit of oil in the cylinders and rotating the crank shaft. t
The rings will push all the debris to the top and the oil allows it to stick when the piston goes back down. I do this several times until there is no debris left.
One thing to remember is when you rotate the crank shaft the sleeves could get pushed up so I try to use the head studs and a piece of steel to lock the sleeves down so they can't lift up.
t
This proceedure does work but not in cases of badly stuck engines. If the sleeves are badly pitted from rust your only option is to get new pistons and sleeves because the rings will never seal properly.

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old

11-27-2005 09:00:47




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 Re: stuck engine in reply to wayne zoellner, 11-27-2005 04:26:38  
First off let me say I have 2 or 3 tractors that had stuck engines on them and I have not had to open any of them up past the valve cover. They now run well and don't use oil, or at least all but one doesn't and that one used oil before the engine locked up. I fill the cylinders with tranny fluid and let it sit for a week or so, then I set a battery on and hit the starter off and on so it sort of thumps the engine. If that doesn't work I then top the tranny fluid off with turpentine, not paint thinner but the good old turpentine which is getting hard to find.

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Dick L

11-27-2005 05:51:09




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 Re: stuck engine in reply to wayne zoellner, 11-27-2005 04:26:38  
I know I sound like a stuck record, but I can only see one way to solve a stuck engine problem and come out with a good running engine with full power. I have bought many tractors with stuck engines and I have bought several unstuck engines that people could not get running after the managed to get them unstuck. A few months back I took apart one of those and posted picures of what I found as I found it. It was the same as I find in disassembling a stuck engine.
After the engine is out of the tractor what you see in the picture is less than an hours work. third party image

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Dick L

11-27-2005 06:10:50




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 Piston and head Pictures in reply to Dick L, 11-27-2005 05:51:09  
This piston was out of the unstuck engine. Not only was the rings stuck in the piston at the sleeve diameter, they were installed improperly the last time it was apart.

third party image

Moving to the head of the unstuck engine. The valve seats were pitted to the point you would never be able to build enough compression to get it to fire.

third party image

Moving to another cylinder in the head you will be able to see that with out removing this valve from the head it would never work freely.

third party image

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cbp

11-27-2005 04:44:16




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 Re: stuck engine in reply to wayne zoellner, 11-27-2005 04:26:38  
Wayne, try a few search words in the forum searches at the top of this page. A lot of people have different opinions about the best concoction to use. I put in Stuck Engine and Stuck Piston and both returned more than I wanted to read. There have been a lot of good threads that are applicable in the other than the AC forum too since this is a problem that doesn't play any favorites as to who manufactured the machine.

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