One easy way to check for shaft misalignment is to loosen the motor mounts and run the motor slowly. If the motor assembly wobbles as the shaft turns then something isn't square.
Misalignment wouldn't cause cavitation though. Here's a random thought, is the boat sitting higher in the stern due to the removed engine weight? That would obviously put the prop closer to the surface, and more prone to sucking air, which is what I assume you mean by cavitation.
--- In electricboats@yahoogroups.com, Anne Racel <amracel@...> wrote:
>
> Wayne -
>
> When I first put the motor in, the shaft had enough discoloration that
> it was easy to figure out where it was before, so that didn't change.
> When I got the new shaft (old one was bent), I'd already drilled for the
> mounts, so, if there was a difference, it should only have been slight.
> I know there is enough distance between the prop and the hull - I've
> measured that since it was an early suggestion made to me.
>
> The shaft diameter is 2", and I know there's not a point where there's
> 80" of unsupported shaft. There is quite a distance between the engine
> and the coupler. I'm at home, not at the boat, so I can't tell you
> exactly. But it seems there's about 16 - 18" there. Could that be part
> of the problem?
>
> Anne Racel
> 4 Degrees
> http://boatjournal.stuffandjunk.net
>
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