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Allis Chalmers Discussion Forum

boring cylinders

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Harry J. Case

10-22-2007 19:49:05

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Hey Guys I'm swapping out the engine of a '37 WC with an early '50s WD engine that I rebuilt, a special thanks to WDTOM because with out his input into the forum on those blankity blank crush bearings I don't think I could have ever got the tolerances right. The problem with the WC engine is the cylinders are visably worn out of round and the pistons are so loose you can see the rings by just looking down beside the pistons, also someone had installed aluminum pistons without removing the previous ring groove from the old cast iron pistons, the compression ring on the aluminum piston is about a quarter on an inch above the old ring groove so you can imagine the stress that would cause. The question is can these sleeves be bored to 41/8 and new pistons fitted ? Thanks, harry

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10-24-2007 22:00:44

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 Re: boring cylinders in reply to Harry J. Case, 10-22-2007 19:49:05  
I don't think you could bore them if you had access to the equipment.

The "o"ring grooves on the bottom of the 4inch sleeves are for 1/8". The grooves on the 4 1/8 sleeves are for 3/32". By the time you open a 4" to 4 1/8", you will nearly cut the sleeve in two at the "o" ring grooves. Or at least greatly weaken them.

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10-23-2007 20:03:58

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 Re: boring cylinders in reply to Harry J. Case, 10-22-2007 19:49:05  
just buy a rebuild kit with new sleaves and pistons and start from new. Bob

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Harry J. Case

10-23-2007 18:31:25

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 Re: boring cylinders in reply to Harry J. Case, 10-22-2007 19:49:05  
Thanks guys, that's what I needed to know. Harry

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Dick L

10-23-2007 12:05:19

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 Re: boring cylinders in reply to Harry J. Case, 10-22-2007 19:49:05  
Unless you have the tools to bore them yourself it would cost more to bore them out and hone them at a machine shop than to buy new.

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Agco Avenger

10-22-2007 20:10:59

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 Re: boring cylinders in reply to Harry J. Case, 10-22-2007 19:49:05  
Can you say, "NEW SLEEVES"
I have bored them .040, that is about the limit, they aren't thick sleeves to begin with, and they are probably very rusty on the outside leaving less good sleeve thickness than when they were new.

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