Don't let it go on too long. I learned that the hard way. Our I-28 had a worn cutlass bearing. One of the symptoms we experienced was excessive vibration of the motor while motoring. The motor vibrated to such a degree, that we kept breaking alternator mounting bolts. When we replaced the cutlass bearing, we ended up replacing the shaft as well. It's my recollection that we had to drop the rudder to get the shaft out. We didn't find that out until the boat was on jack stands, but we lucked out, as the boatyard wasn't paved, so I just dug a hole under the rudder to get it out.
Good luck. We really liked our Islander 28. It was a good boat.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.