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Tool Talk Discussion Forum

More on salvaging pistons

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ldj

06-05-2006 13:30:54




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I may not be as bad as I thought. I measured the ring thickness, it is .0860, a few thousands under 3/32. my piston groove is a couple thousands over 3/32, Now maybe my ring has wore thin instead of the groove.It being a cast iron piston I think it is possible. For a 3/32 ring, should it be 3/32 minus enough for clearance in a 3/32 groove? OR, should the groove be 3/32 plus enough for clearance for a 3/32 ring. If the later and new rings actually measure .0937 (3/32), then I'm good to go.

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the tractor vet

06-06-2006 06:54:30




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 Re: More on salvaging pistons in reply to ldj, 06-05-2006 13:30:54  
With all your fussen about OLD pistons for 400 bucks for a complet kit and 88 bucks for boring and honing i would not waiste my time tryen to use OLD pistons in a old wore bore that the end resualts will be and oil burner or a thumper . Do it wright the first time and it will out live you . And while your at it install new cam bearings.



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ldj

06-06-2006 17:12:34




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 Re: More on salvaging pistons in reply to the tractor vet, 06-06-2006 06:54:30  
Tractor vet,
I know you are right about doing it right and I know how to do it right.There are times when it isn't necessary for what you want to do. Right now I don't want to take the time to split the tractor. In a year I'll be retiring and have plenty of time. That is one reason I want to patch it up. Another is I just bought this tractor and I don't know anything about it. If I can make it run a while, I'll know what all else will need to be done and can completely redo the whole thing at one time. Heck I might get that engine running and find out the tractor has so much else wrong I'll just let someone else have it. I come from the old school where we knurled pistons and guides, cut rod caps and rebored rods, Have a machine shop come out with a portable grinder and turn 1 journal. Bet you couldn't get that done now if your life depended on it. There is nothing wrong with being thrifty, OK cheap. A while back I was overhauling a small 1 cylinder aircooled engine and they wanted $57.00 for the rings for that 1 piston. I did some research and found the exact same size rings for a I6 Ford for $39.00 for 6 pistons. You know, they wouldn't sell rings for 1 piston. Now I still would like to know how thick 3/32" rings are so I can patch up this tractor with or without shims.
L.D.

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the tractor vet

06-06-2006 20:58:34




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 Re: More on salvaging pistons in reply to ldj, 06-06-2006 17:12:34  
Well it's a cub and they don't have much to them , I rebuilt my brother whole rear end from transmission thru the finals in a after noon pput in all new bearings and seals as there ain't much to them . Now from where i get my engine parts from i can get one set of rings for one piston if i need it that way and last year i did for the 706 got one piston and one set of rings . But then again i buy Jobber from a warehouse . And no today nobody does on the job grank grinding and the days of knerlen a piston is dead and gone . Now days it is take it in and have it done . With the modren machines they are more accuarte and faster. Now if ya want to file end gaps then order a set of ten over and don't worry about the piston . as for me when i do a cub i install the new alu. pistons out of a 184 and put the new style carb on them .

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TomTX

06-05-2006 14:12:19




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 Re: More on salvaging pistons in reply to ldj, 06-05-2006 13:30:54  
Go by the tolerances and measurements given in the Repair Manual. If you don't have a real repair manual (not IT) then get one. Tom



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