sudden vibration with my bayliner

[jimmytrau]

I have a 1987 bayliner capri, 3.0 liter omc. While boating at a slow speed, all of the sudden the boat started to vibrite for no reason. I stopped quickly, raised the lower unit, check to see if anything was wrapped around the prop and to check any damage. Nothing around the prop, no damage to it either. I continued a move at slow speed, still vibriting so moved it up to 3 to 4000 rpm's and it stopped. I then brought it back to slow and continued on. As time went on the vibration became less and less. By the time I got back to the dock, there was still a vibration but not really to bad. My question is, what would cause it to suddenly start to vibrite, then slowly go away. Any advice would be helplful. thanks Jim

 

[o2batsea]

Does it vibrate in neutral? Reverse?

 

[jimmytrau]

No vibration in neutral, I never used reverse after the vibration started, drove it forward, right on the trailer and home. I'll be taking the boat out this weekend, will check reverse then.

 

[o2batsea]

Remove the prop, put it in gear and see if it vibrates F N R.