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John Deere Tractors Discussion Forum
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filing ring end gaps

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andy r

07-20-2007 20:18:57




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What are some of the best ways to file ring end gaps? I want to put .045 oversize in a standard bore. I would assume an air prowered cut-off grinder or a 4 1/2 inch electic hand grinder might work. Any other ideas?????

Thank you.




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bigblock

07-21-2007 18:29:09




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 Re: filing ring end gaps in reply to andy r, 07-20-2007 20:18:57  
use a piston in the bore to keep the rings square



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P Browning

07-21-2007 16:34:37




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 Re: filing ring end gaps in reply to andy r, 07-20-2007 20:18:57  
Andy -- before I spent one more red dime, I would want to mic out the bore on each side -- looking for wear -- both in size and shape! New rings will be little more than a disappointment of the bores are shot. Pulling the cylinder block out is not that big of a deal -- just more cleaning for a new gasket and perhaps a tappet oil line disconnection inside the crankcase!

At any rate, once you have the measurements, THEN ask questions as to how to proceed. Someone with a quality micometer and the skill to use it -- OR -- take the block to an engine rebuilder for answers. Then you will know you did it right! Be Blessed! (PatB)

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johns48jdb

07-21-2007 16:01:41




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 Re: filing ring end gaps in reply to andy r, 07-20-2007 20:18:57  
i always thought that you needed some end gap clearence on any ring to allow for expansion when it gets hot. so why does the end being square matter? ok educate me or give me 10 licks with a wet noddle.



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G/MAN

07-21-2007 16:15:43




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 Re: filing ring end gaps in reply to johns48jdb, 07-21-2007 16:01:41  
The ends have to be square to get an accurate measurement of the ring gap, and having the ends square will keep the ring as cool as possible, and keep the gap more consistent as the ring warms up. It's also a strength issue. If you've got a big angle where you grind, you'll wind up with a sharp edge sticking out there that can easily overheat and/or break off.



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johns48jdb

07-21-2007 18:10:01




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 Re: filing ring end gaps in reply to G/MAN, 07-21-2007 16:15:43  
thanks for insight g/man. i was just curious if the end would break off or just melt. not that it makes any difference it would still be bad news. i'm part cat i think.



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teddy52food

07-21-2007 14:52:49




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 Re: filing ring end gaps in reply to andy r, 07-20-2007 20:18:57  
If the cyl is wore that much, it should be bored & new pistons put in. Remember to fit the rings at the bottom where there is less wear if you are just putting in rings.



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G/MAN

07-21-2007 12:59:16




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 Re: filing ring end gaps in reply to andy r, 07-20-2007 20:18:57  
Uh, that's a LOT of extra material to file off. File-fit rings are generally a few thousandths oversize for the bore they're designed to fit, not tens and tens of thousandths. There's a difference in the overall DIAMETER of the rings when going to an oversize ring, not just less material at the ends. Are those rings till going to be "round" when you file them enough to stuff them in a standard bore? I think not, and your ring seal could easily suffer as a result. My advice? By the proper rings. If you insist on going down the path you're on, there are tools made specifically for what you're doing. And make sure to de-bur the ground ends unless you want to scratch the bores.

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Mike M

07-23-2007 05:41:59




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 Re: filing ring end gaps in reply to G/MAN, 07-21-2007 12:59:16  
G/MAN I hope he listens to your advice about the rings still being round. I learned that lesson the hard way on an old air copmressor that had odd ball size rings and a custom ring maker sold me oversized ones I had to cut to fit. Pumped oil really bad. That ring maker should of known better ! Now I do ! LOL years later.



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Bob

07-20-2007 22:47:55




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 Re: filing ring end gaps in reply to andy r, 07-20-2007 20:18:57  
I have a unit similar to the one in the link below, and it works GREAT, and makes it easy to keep the gap "square".



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Dave in Tx

07-20-2007 21:50:42




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 Re: filing ring end gaps in reply to andy r, 07-20-2007 20:18:57  
I always used an 8" flat b@stard file, and filed one side and keep it square so when you squeeze the ends together they match up. Doesn't take long at all.

Dave



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andy r

07-20-2007 22:11:23




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 Re: filing ring end gaps in reply to Dave in Tx, 07-20-2007 21:50:42  
OK ... I will try a file. I figured the rings were really hard and a file would not do the job. Thanks for your suggestion. andy



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