The ball mic is an adjustable device that is placed in a hole and expanded to ft. It is then measured out of the hole to assess the size. When using the same instrument to actually measure the inside and outside Diameter, one gets a good measurement. With rust in the cylinders, it will be necessary to disassemble the engine. If it is light surface rust, and the engine is basically able to be turned over, it deserves looking at the wear on the sleeves to see if they are usable. If you can feel a step in the bore of the sleeves where the top piston ring stops on its travel upward, it needs to be measured. THis spot is the heaviest wear location in the cylinder. If the step measures more than .005" in diameter difference (measured at the very bottom of the cylinder, compared to the widest at the ring wear) it will be necessary (and cheaper) to buy a kit for the engine (about 650 or so fro m this site, or other sources. Shop. RIngs, pistons, and a bore/hone on the existing cylinders will be more than the kit. Best of the season, and of luck. JimN
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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