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What is the difference between truing and indexing four cylinder press-together cranks?

April 26, 2017cranks cylinder difference indexing truing

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What is the difference between truing and indexing four cylinder press-together cranks?

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A crank is trued to insure that it is not running “out of round” or that it is not “bowed” on it’s main bearings in relation to each other and to the engine cases. A crank is indexed to insure that each big end pin is the proper degree apart from each other and not twisted out of index. In a GS1100 or KZ/MK/Z1’s case, the crank pins are spaced exactly180 degrees apart from one another.