New Sudden Vibration??

[aerolland]

Spent the night last night surfing, boat ran under load for ~4hrs with no problems other than a blip in fuel pump pressure - damn relay...

While idling back to the dock we felt what we thought was the prop picking up a stray rope. We were ~200 yards away from the landing so we kept idling to it. At one point I throttled up slightly and the vibration increased and became severe. Pulled the boat out expecting to see a wrap around the prop but there was nothing there! Inspected everything under the boat:

• cutlass bearing - in place and no play
  
• prop - no sign of striking anything and no bends, nothing that appeared significant enough to cause that kind of vibration
  
• shaft - intact, no bend, rotates with normal resistance

Once home I thought about the coupler bolts behind the V-drive - they are all in place and tight. All mounts (V-Drive, Tranny) are tight. If the flex plate began to break, could that cause what I was feeling? Do they break at idle conditions???


What should I look for next? Any chance it picked something up like a rope and when it stopped turning it shed it? Odd....

[Stazi]

Could have been a clump of weeds that eventually shredded. That will do the same thing.


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[aerolland]

Could have been a clump of weeds that eventually shredded. That will do the same thing.


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Clean lake that doesn't have much if any growth like that, and was in the main channel at the time.

[Stazi]

If it’s gone now it could have been anything, even a bag


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[aerolland]

If it’s gone now it could have been anything, even a bag


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Since I assumed it was a line of some sort, I pulled the boat out. after I found nothing there I should have put it back in and tested but it was late. I guess I'll have to make a special run to the lake to test. Could a bag really do that?? I would think the prop just tear right through it

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[parrothd]

Since I assumed it was a line of some sort, I pulled the boat out. after I found nothing there I should have put it back in and tested but it was late. I guess I'll have to make a special run to the lake to test. Could a bag really do that?? I would think the prop just tear right through it

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Yep, bag or weeds..

[aerolland]

If I kept water flowing against the cutlass bearing and while on a fakealake, you think I could spin prop on trailer to test?

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[Stazi]

No. It won’t show up without it being actually in the water.


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