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What size sleeve O-Ring for B

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Bob (So ME)

09-11-2003 20:48:35




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Am starting to tear down my B and will need sleeve seal rings for sure, what size do I ask for? In the event it needs piston rings are they & sleeves avilable separately? Thanks, you folks have helped me out of tight spots before.




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steve

09-12-2003 16:12:53




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 Re: What size sleeve O-Ring for B in reply to Bob (So ME), 09-11-2003 20:48:35  
i reassembled a disassembled motor last year and replaced several parts, keeping the original pistons and liners, which i honed. I bought a gasket set and rings from Norms Toys- good price. the gasket set does nothave o-rings. i could not find them listed so i bought from McMaster Carr. Get a bag of 25 for maybe $10.00 i forget the size right now. i had them off and just measured the grove for ring ID. The o-rings will look square when removed, they are round when new. THe piston rings i got were 3 7/16. all kits assume you are boring out and installing the replacement pistons. mine were original and 3 3/8 diameter. I looked on the internet for Hastings Piston Rings. THey sell various kits. I looked up a 4 piston kit, 3-3/8 with the right oil ring, compression rings, etc, and they had it. It did not say Allis B, but it was for that motor. About $60.00 set, same for the gasket set. I had several thousandths land at the top of the liners. cut it and honed the cylinders for new rings. matched up correct ring gap at the bottom, but had quite a bit extra gap at the top. I was not trying to spend top $$$. Was going for a $150 rebuild that would be adequate for general purpose/ light duty/ show tractor. Reassembled, reshimmed the original bearings to .002 clearance, ground my own valves,added stem seals, etc. It runs real good and dont burn oil. Have only run a few hours, but works good for what i need. Put it in a "spare" tractor just to start up and test prior to this winter. so far so good.

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Bob (So ME)

09-12-2003 18:47:19




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 Re: Re: What size sleeve O-Ring for B in reply to steve, 09-12-2003 16:12:53  
Thanks Steve. It is for a tractor that sat under a barn since mid 1970s and stuck. It will only have occasional light use. I will tear it down and see if I can follow your method. It might also need new pistons sitting that long. Hope I have the good luck you got.



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