I worked on an inboard motor before working on a gear case for an outboard motor, what I had to do was to make sure the engine drive sprocket was square with the drive shaft sprocket with out any restriction when you turn the driven shaft. I measured the diameter of the drive sprocket and use a DTI gauge to check the amount of runout it had which was 0.03mm. By using spacers, which were little plates of metal, i inserted them in where the engine mounts were to get the engine lined up with the propeller shaft properly.
I also used a feeler gauge/flare gauge and placing it between the drive and driven sprockets to check if there is any deflection between the two, if the flare gauge gets stuck in one place, but is fine as the rest of the shaft spins, that means that the engine isn’t inline and will have to be adjusted, either spun left or right slightly, tilted up or down. or moved to a side then twisted round slightly to match perfectly.
Excellent
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