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Cylinder wear

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gordon

11-27-2000 19:52:54




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I am restoring a 1936 JD A. After honing, the cylinders show .025" wear at the top or end of stroke and very little wear at the bottom. They have .045" oversized pistons. This tractor will not be used for work, just show and parades. Should I put in new rings and go on or have it bored and sleeved back to .045"??




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Ed

11-28-2000 05:24:36




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 Re: cylinder wear in reply to gordon, 11-27-2000 19:52:54  
My '36 A had .020 wear and I decided not to bore but to re ring and I have regretted it ever since. Its a little noisy and blows oil out of petcocks. I will always feel I cut that corner on my favorite show tractor. Never again. Do it right is my advice.



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clooney

11-28-2000 05:22:23




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 Re: cylinder wear in reply to gordon, 11-27-2000 19:52:54  
Gordon, if it were mine I would bore it to .090" & put new pistons in, that being said & what the intended use is going to be you might want to do some more measurement to see if you can live with what you have. Measure back down the bore & see if the second or third ring will sit in a place that is more within reason on the bore diameter, if you can't get the second or third ring to seal in an area that is under .010" then a rebore is probably a must. Also see what the out-of-round in the bore is, if it's out more than .003"-.004" you will have problems getting the ring(s) to seal. Then look at the pistons & see how worn all the ring grooves are, if there is pitting or a lot of ring side clearence you will probably have blow by. Then see how much piston wear is present (if they are worn then you have even more clearence "measure just below bottom ring groove"). If you decide to run it as is then make sure you check the ring end gap at the bottom of the stroke & not the top as you want to check the end gap at the tight spot so you don't break a ring when it gets to the tight spot. If you put it back together with the .025" piston to cylinder clearence at the top you probably will have piston slap under load & a little oil puffing under changing load & a long ring seating break in.

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gordon

11-28-2000 09:33:28




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 Re: Re: cylinder wear in reply to clooney, 11-28-2000 05:22:23  
Thanks to everyone for the input. Where is a good source for .090" pistons? John Deere??



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burnsOmatic

11-28-2000 11:48:54




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 Re: Re: Re: cylinder wear in reply to gordon, 11-28-2000 09:33:28  
I would recommend that you select a good aluminum piston. Clevite and M&W are excellent choices. Your compression will rise between 125-140psi. It will give you a little more kick (2-5 hp). I bought a set of M&W .125 pistons for my G from Dennis Polk for $405. Hinrichs Repair sells Clevite. There are some fine folks that frequent this site that sell both. By the way, have you thought about shaving the head? I know it is a show tractor but while you have it off??? I took .125 off our 48 A. A friend of mine shave .280 off his 48 A.

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burnsOmatic

11-28-2000 04:04:58




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 Re: cylinder wear in reply to gordon, 11-27-2000 19:52:54  
If it was my tractor, I would not sleeve the block unless I absolutely had to. If you bore the block to .090, you will still be able to go one size bigger if you had to (probably will never in your life time). You are probably looking at $100 for rings alone. For $300-$350, you can get a high compression piston, new rings, and new wrist pin. If you do it now, you won't have to go back in later to fix what you could fix today. My money doesn't come easy so I understand that for a show tractor is it really worth it? I say yes simply because our time is worth something and we all know how much time it take to get a John Deere down to the point you are at. Good Luck

By the way, I DON'T SELL PARTS FOR JOHN DEERE. I am not trying to make a buck!

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G Taylor

11-27-2000 21:29:04




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 Re: cylinder wear in reply to gordon, 11-27-2000 19:52:54  
Can't seal an oval hole with round rings/piston efficiently. Depends on how much oil control and plug fouling you are comfortable with. Also the looser the engine, the more it knocks.



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Wayne Swenson

11-27-2000 20:19:10




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 Re: cylinder wear in reply to gordon, 11-27-2000 19:52:54  
I would definitely rebore or replace the sleeves. Think about this: as the rings move from the unworn area to the .025" worn area, the end gap on the ring will increase by about .078" (3.1416 times the amount of diameter change).
That much end gap would be excessive in my book. The rings will flex that much each stroke of the piston. Lots of wear and loss of compression + oil.
Good luck!

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