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JD A engine question

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Pat wc IA

12-26-2002 18:34:37




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I have the cylinder head off of an unstyled JD A (SN 444885) and pressed in the top of each cylinder bore is a steel (or cast) ring about 3/8-1/2' thick that extends down into the cylinder about an inch or so. It is also machined for the intake and exhaust valve to miss it when they open. I believe this has been put in as a cheap way to raise the compression. Did someone like Heisler or M&W make these? Do these ever break and fall out? Should I leave them in or remove them?

Thanks!

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Gordon

12-26-2002 22:17:20




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 Re: JD A engine question in reply to Pat wc IA, 12-26-2002 18:34:37  
Those rings are held in place with a spark plug adaptor. Take that out and they will come out.You can do what you want is your tractor.



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Paul from MI

12-26-2002 19:03:59




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 Re: JD A engine question in reply to Pat wc IA, 12-26-2002 18:34:37  

Yes this was a way to increase compression without changing pistons. It probably was OK if the cylinders and pistons were in good shape. If it were mine and the rest of the cylinders look good, I would leave them in. Of course if you plan to bore it and replace pistons, then gas pistons is the way to go. I assume you aren't planning on running it on kerosene, if you are remove them. LOL,
Paul

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Mike

12-27-2002 07:34:55




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 Re: Re: JD A engine question in reply to Paul from MI, 12-26-2002 19:03:59  
Would it be correct to say that that tractor has the hollingworth high compression inserts? sounds like this is what it is.



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