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Allis Chalmers Discussion Forum
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Question rings or liners?

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DavidKittle

10-22-2007 16:38:03




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I was wondering how bad the rings and cylinder wear has to be before you have to buy liners with the new pistons. I am considering honing out the sleeves and getting new rings from agco. Got a D-17 series III, and might do it this winter.

ppreciate any help




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DavidKittle

10-27-2007 11:06:53




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 Re: Question rings or liners? in reply to DavidKittle, 10-22-2007 16:38:03  
Hey;

Where would a guy get a set of puillers to get out the old liners?



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steve(ill)

10-22-2007 19:15:56




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 Re: Question rings or liners? in reply to DavidKittle, 10-22-2007 16:38:03  
Dick is talking about taking the bore diameter and the piston diameter and having less than .010 clearance between them. You will probalby have a land at the top that needs cut off. then the top of the bore when measured will probably be .005-.010 bigger than the bottom. Thats the limit. since the diameter of a hole is 3 times the bore, if the bore is .010 oversize, then the circumference would be .030 bigger which is the ring gap. Thats why Dick said you might be able to get oversize rings and install. Just make sure you dont get too tight at the bottom. The last "old" motor i overhauled i honed and put new rings. had .007 ring gap at the bottom of the stroke and about .018 at the top. Still runs fine. Tapered bore (old) will do that.

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Dick L

10-22-2007 18:59:18




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 Re: Question rings or liners? in reply to DavidKittle, 10-22-2007 16:38:03  
If with the rings off the piston and you can get a .010 feeler gage between the piston and sleeve with the piston down in you are to the limit. With the proper ring you can get good power if not farming with the tractor. Standard ring will not get you much. With a new ring down in the hole square you don't want much more than .007 between the ends of the rings. I used to buy what was called over size rings. They were not only larger around but were deeper to ride where they should in the piston groove. If you get every thing measured you can go to hastingsmfg.com and order the proper rings.

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wdTom

10-22-2007 17:52:33




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 Re: Question rings or liners? in reply to DavidKittle, 10-22-2007 16:38:03  
If there is much of a ridge at the top of the liner honeing may not do what you want. Can you measure the cylinders at the top and compare with the new dimension? There is an allowable wear limit probably listed in your repair manual, compare your measurements with this. Check piston to cylinder clearance and compare this with the book too.



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mlpankey

10-22-2007 17:42:53




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 Re: Question rings or liners? in reply to DavidKittle, 10-22-2007 16:38:03  
hone it the put a new ring in the honed cylinder .and use a feeler gauge to check the ring end gap.



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