Re: 280 volvo penta outdrive
You may very well have the bearings in the flywheel housing going bad.
On the 280, there is an intermediate shaft from the engine coupler to the drive.
If there is water ingress into the drive bellows area, it's very common to have to replace the shaft bearings as well as the ujoints on the 280 drive shaft.
There are 2 types of flywheel housings, a 1 bearing and a 2 bearing style. The 1 bearing style can be done from the rear of the boat, but the 2 bearing style requires removal of the engine to re and re.
Chay