07 SAN 210 random v-drive/tranny noise

[justsan]

This morning I pulled out of the 5mph to drive to our riding spot, as I accelerated we heard a loud noise coming from the v-drive/ tranny area and I backed off...it sounded like a bunch of nails being shook in a tin can.
I would accelerate/ take off to about 10mps and the noise was still there. After a few more take off attempts and the noise still being there, I said screw it and went a little faster and the noise went away. The noise was there for the first 30 min of riding then went away, but came back a little later in the day, and went away again.
Last weekend my serpintine belt frayed and I just replaced it, this was the first trip out with the new belt but all looked/worked fine with that....(just thought I'd give a little back round).

Any thoughts as to what the loud noise could be? ...and why it goes away after about the 10 mph mark when the boat gets out of the hole?

Thanks!

[xrichard]

RE: 07 SAN 210 random v-drive/tranny noise

I haven't experienced it first hand, but the first thought that comes to my mind is the the damper plate (e.g. a broken spring on the damper plate).

Another thought: last time I was out I heard a moderately loud rattle that went away as I sped up. When I pulled the boat, I noticed the tuning fin on the rudder was loose and I'm pretty sure that was the culprit (I haven't had a chance to drop in again so I haven't verified the problem). When I knocked the loose fin back and forth, it banged against the rudder and sounded very similar to what we heard in the boat.