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Old 06-29-2011
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shaft\coupling tolerance

I am replacing the propshaft coupling on my v drive. The propshaft is not a standard size and I need to have the coupler machined to a very slightly larger bore size. What should the tolerance between the propshaft and coupler bore be within?

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Old 06-29-2011
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+ .001 -.000 ? or is greater acceptable?
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Old 06-29-2011
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Connection between the shaft and coupling is usually a taper.
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Fairly certain this is not tapered. nonsuch 30 westerbeke 27 V drive
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Old 06-30-2011
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I believe it is a press fit.
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Old 06-30-2011
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It should be a light press fit if this is a straight coupling. It should NOT just slide over the shaft easily.. This fit is usually fitted by hand by the machine shop. I would suggest using a "split" coupling then the fit is not quite as critical but it should still be pretty snug on the shaft.
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Last edited by Maine Sail; 06-30-2011 at 06:57 AM.
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Ahhh forget it!
hauling boat, replacing shaft and all.

Thanks for the help though!
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Old 06-30-2011
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A properly sized taper lock coupling should not present any difficulties . The taper lock bore is designed to tighten on the shaft as the taper is driven into the coupling via grub screws. Some systems also use a key to deliver the drive but that must be machined into the shaft.
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