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Flywheel alignment
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<blockquote data-quote="timetraveller" data-source="post: 112302" data-attributes="member: 456"><p>Bill, You know I am not an engineer so what I say is not based on many years of experience but I do feel that you are heading for trouble with this. An alternative I would think about it to press the timing side main shaft out, then to the welding up the holes. You will have to find someway of refinishing the faces each side of the flywheels however you do this job. Then press the timing side flywheel down onto the drive side mainshaft original outer faces together. Use some of the original balancing holes to act as dowel holes and make few dowels up to fit, say four of these holes. Then take the whole thing to any local machine shop where someone will work for cash and explain exactly what you want. They can use the original centre in the mainshaft to centralise their boring head and then they can offset the whole thing by as many mm or inches you wish and go straight through both wheels in one go. They would probably want to do one under sized cut and then a final one to give you whatever interference fit you want on the crank pin, probably 3 or 4 thou but that is going to depend upon varying parameters. It will take them longer to set up the job than to do the cutting, even taking into account doing two cut, but once you have explained what you are up to I imagine that it will not take more than about half an hour. This way you have no reaming to do, no welds to cut and make good and you can be sure the offset distance from the mainshaft to the crank pin, on both flywheels, is what you want.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 112302, member: 456"] Bill, You know I am not an engineer so what I say is not based on many years of experience but I do feel that you are heading for trouble with this. An alternative I would think about it to press the timing side main shaft out, then to the welding up the holes. You will have to find someway of refinishing the faces each side of the flywheels however you do this job. Then press the timing side flywheel down onto the drive side mainshaft original outer faces together. Use some of the original balancing holes to act as dowel holes and make few dowels up to fit, say four of these holes. Then take the whole thing to any local machine shop where someone will work for cash and explain exactly what you want. They can use the original centre in the mainshaft to centralise their boring head and then they can offset the whole thing by as many mm or inches you wish and go straight through both wheels in one go. They would probably want to do one under sized cut and then a final one to give you whatever interference fit you want on the crank pin, probably 3 or 4 thou but that is going to depend upon varying parameters. It will take them longer to set up the job than to do the cutting, even taking into account doing two cut, but once you have explained what you are up to I imagine that it will not take more than about half an hour. This way you have no reaming to do, no welds to cut and make good and you can be sure the offset distance from the mainshaft to the crank pin, on both flywheels, is what you want. [/QUOTE]
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