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John Deere Tractors Discussion Forum
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Piston Ring Positioning on Piston

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BUDD

02-22-2004 07:02:06




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I am installing my pistons in my 49 "A" with new rings today. How do I position the rings on the piston when installing them in the cylinders? Do I set the gap at 180* apart from one ring to the next or do I set them at 25* apart or what?

As always THANKS for your help BUDD




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jdemarisj

02-22-2004 19:14:54




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 Re: Piston Ring Positioning on Piston in reply to BUDD, 02-22-2004 07:02:06  
I've found over the years that staggering the ring gaps 180 degrees apart works better than 90 degrees unless the rings are pinned. Some race application, motorcylce, and chain saws have pins that keep the rings from walking around the piston, so in those cases 90 degrees works fine. In most other situations, though, as exists in most farm tractors and automobiles, the rings can walk around a bit and line up after a rebuild - especially if they're babied and not worked hard right away. Once the rings seat, they tend to stay where they are.

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DON

02-22-2004 15:01:18




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 Re: Piston Ring Positioning on Piston in reply to BUDD, 02-22-2004 07:02:06  
I always stagger them at least 1/4 turn from each other as long as none of the gaps line up. Don



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DON

02-22-2004 15:00:50




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 Re: Piston Ring Positioning on Piston in reply to BUDD, 02-22-2004 07:02:06  
I always stagger them at least 1/4 turn from each other as long as none of the gaps line up. don



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Ron

02-22-2004 08:06:38




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 Re: Piston Ring Positioning on Piston in reply to BUDD, 02-22-2004 07:02:06  
Ring end gaps should be approximtely over each wristpin side.. Alternate them, stagering some..leaning a little to the upper side is my preference. Since it is hard to keep track of just where the ends are, in a ring compresser. I hope this makes sense to you..I don't seem to be able to describe it any better...!!



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