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Old 12-05-2015, 10:37   #1
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Boat: Farr 11.6
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2-Blade Gori on Yanmar Saildrive - nut loosening and prop wobble

Hi Guys,

I took the 2-blade Gori prop off today to diagnose the 10deg free play of the prop hub on the saildrive shaft. It looks like half the play is between the prop hub and its internal spline... I assume this is the flexible bushing Gori talks about for reducing vibration going back into the Saildrive. Are these serviceable at all?

The second half of play came from the female/male spline interface which I assume was due to the prob not being pulled up onto the shaft enough by the shaft nut. This was indeed alarmingly loose and I was able to undo it with my fingers. The nut has been drilled out to accept a split pin, but the drive shaft end thread has not . Gori's exploded diagram shows the split pin so I take it the nut came with the prop not the Saildrive.

I vaguely remember an installation note within the Gori manual which I can not find anywhere at the moment specifying a special nut to be used with Gori 2 and 3 blade props on a Yanmar Saildrive. Not that I can find that information online anywhere. Can anyone shed light on this and how it locks onto the shaft and whether it'd pull the prop up more onto the drive shaft.
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Old 13-05-2015, 10:04   #2
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Re: 2-Blade Gori on Yanmar Saildrive - nut loosening and prop wobble

After much ringing around and being put through from dept to dept at the one national distributor for both Yanmar and Gori It seems that it's not the nut but the thrust washer behind the prop hub that is the problem with my setup. The proper washer to be used on an SD20 shaft is ~2mm thicker and thus makes the prop hub stick out past the shaft shoulder so the nut tightens the prop onto the spline. The washer is a Yanmar part, otherwise you could easily install a stainless flat washer to bring the prop out... you can also machine a small recess in the nut so it contacts the prop first which might be a neater diy solution.

If it helps anyone its Yanmar part#: 196420-09250 AU$65
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