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Allis Chalmers Discussion Forum

Engine overhaul 39B

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09-05-2007 11:01:25

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I'm overhauling a 39 B.I'm getting New valves,springs,seats.Got the head shaved.Pistons and sleaves look good.Does any one know where I can order Rings.this site only sells the whole kit w/pistons etc.Is this a bad idea to just replace the rings? I know I should replace the rings due to the increased compression,I was just hoping to just replace the rings.thanks Troy

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Dick L

09-05-2007 19:09:53

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 Re: Engine overhaul 39B in reply to TroyR, 09-05-2007 11:01:25  
No way you or anyone can know if you should just buy and install rings without measuring the hole to see if it is way over sized. When a new ring is placed down in the cylinder (square and true) the gap between the ends of the ring should be .007. All the work on the head will not be put to good use if that ring gap is over .010 to .012. Your wife wouldn't think of buying new curtains without first measuring the window she was going to place them on. Measuring the inside of the cylinder will tell you which way to go. To buy rings or an engine kit.

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09-05-2007 18:30:44

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 Re: Engine overhaul 39B in reply to TroyR, 09-05-2007 11:01:25  

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bjb in Ne

09-05-2007 13:37:01

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 Re: Engine overhaul 39B in reply to TroyR, 09-05-2007 11:01:25  
This site (which I bought my WC rings from) as well as hasting rings (do a google search) both have ring sets. I think hastings might even have oversized rings if needed

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09-05-2007 11:53:12

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 Re: Engine overhaul 39B in reply to TroyR, 09-05-2007 11:01:25  
Value bilt lists rings for the B/C/CA/RC. So I know they have them.

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Texas Denny

09-05-2007 11:49:37

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 Re: Engine overhaul 39B in reply to TroyR, 09-05-2007 11:01:25  
If the pistons and sleeves are in spec, there is no reason to replace them. I've re-ringed a number of tractors with excellent results. When I buy rings and gaskets, I get them from Rusty Acre in Austin, MN. There email is manifold@smig.net and the phone is 507-433-0073. Don Livingston is the boss.

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