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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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