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Freeing stuck pistons (again)

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David (Scotland

08-05-2002 16:23:08




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I was told yesterday that you shouldn't use penetrating oil, diesel, or engine oil to help free stuck pistons as it allegedly damages the rings. The guy that told me this said that brake fluid was the thing to use. There was no mention of it being hot as was discussed in the earlier posts about this topic. I can see that using hot brake fluid would be quite likely to work but is he talking nonsense about the other stuff?

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Paul

09-30-2002 20:19:32




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 Re: Freeing stuck pistons (again) in reply to David (Scotland), 08-05-2002 16:23:08  
Brake fluid is extremly hygroscopic ( absorbs moisture out of the air) I cant imagine letting it soak for very long



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Ryan Free

08-18-2002 21:30:11




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 Re: Freeing stuck pistons (again) in reply to David (Scotland), 08-05-2002 16:23:08  
I've had great luck with PB Blaster. Works good on Valves and Pistons.



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zach

08-11-2002 17:00:03




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 Re: Freeing stuck pistons (again) in reply to David (Scotland), 08-05-2002 16:23:08  
use penetrating oil
howes lubricator
tri-flow lubricant
automatic transmition fluid
all these work

whoever told you that is full of it.



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RobertTX

08-06-2002 05:41:40




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 Re: Freeing stuck pistons (again) in reply to David (Scotland), 08-05-2002 16:23:08  
Kind of depends on how much of a hurry you are in. If you are planning to pull it apart and start beating, then something that is a little corrosive might be OK. If you wnat to let it soak and free it without disassembly, I would not recommend brake fluid. If you have ever taken apart an old brake cylinder that has been sitting and gotten a litle moisture in it, you will know why - they are usually throw aways due to the corrosion.

I have been successful soaking Marvel Mystery Oil, but it is not a quick process. One thing to think about is if you give it some time to soak, the rings can also free up in the grooves somewhat. They can be really tough to get out if stuck.

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Lenn

08-06-2002 05:16:27




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 Re: Freeing stuck pistons (again) in reply to David (Scotland), 08-05-2002 16:23:08  
It would be interesting to hear his reasons,i sure can`t think of any.



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Don LC

08-06-2002 05:12:47




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 Re: Freeing stuck pistons (again) in reply to David (Scotland), 08-05-2002 16:23:08  
I would use WD-40....remove the spark plugs and pour about a 1/2 cup in each cylinder...let it sit overnight ...leave the plugs out....put the transmition in highest gear and gently rock the tractor back and forth.....



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Lenn

08-06-2002 05:28:43




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 Re: Re: Freeing stuck pistons (again) in reply to Don LC, 08-06-2002 05:12:47  
I`d also like to add that it depends on how long and how stuck the pistons are,the method Don LC said would work good for mildly stuck and my brake fluid method i posted earlier for the ones that have sat in the same spot for long periods of time. Crank position has a lot to do with it,if the crank is at top or bottom center you won`t have any leverage when trying to turn the eng. with wheel or flywheel. Sometimes i have made a false head out of plate steel and put a grease zerk in it and pump the cylinder full of grease,use caution with this method for one can get tremendous pressures this way.

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