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Thread: New Sudden Vibration??
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06-25-2020, 09:46 AM #1
New Sudden Vibration??
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....2008 OBV
325 EFI with closed cooling
Gravity III with 750's in the rear, 400 stock floor, 750 IBS
Servo valve ballast upgrade
Wetsounds Rev10
JL Amps, WS420BT
2000 Outback LS <-- Sold!!!
310 Carb Direct Drive
800# Rear Locker
750# IBS (should have kept this for the OBV)
Dual Batteries with 2 Bank Charger System
Kenwood Head with Remotes
Too many hours restoring exterior from prior negligence to count!
- cutlass bearing - in place and no play
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06-25-2020, 10:30 AM #2
Could have been a clump of weeds that eventually shredded. That will do the same thing.
Sent from my iPhone using Tapatalk2017 Moomba Craz
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06-25-2020, 11:06 AM #32008 OBV
325 EFI with closed cooling
Gravity III with 750's in the rear, 400 stock floor, 750 IBS
Servo valve ballast upgrade
Wetsounds Rev10
JL Amps, WS420BT
2000 Outback LS <-- Sold!!!
310 Carb Direct Drive
800# Rear Locker
750# IBS (should have kept this for the OBV)
Dual Batteries with 2 Bank Charger System
Kenwood Head with Remotes
Too many hours restoring exterior from prior negligence to count!
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06-25-2020, 05:28 PM #4
If it’s gone now it could have been anything, even a bag
Sent from my iPhone using Tapatalk2017 Moomba Craz
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06-25-2020, 06:02 PM #5
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
Sent from my SM-G955U using Tapatalk2008 OBV
325 EFI with closed cooling
Gravity III with 750's in the rear, 400 stock floor, 750 IBS
Servo valve ballast upgrade
Wetsounds Rev10
JL Amps, WS420BT
2000 Outback LS <-- Sold!!!
310 Carb Direct Drive
800# Rear Locker
750# IBS (should have kept this for the OBV)
Dual Batteries with 2 Bank Charger System
Kenwood Head with Remotes
Too many hours restoring exterior from prior negligence to count!
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06-25-2020, 06:34 PM #6Senior Member
- Join Date
- Aug 2011
- Posts
- 2,522
http://www.instgram.com/jlyons30
2002 Moomba Mobius LSV - Sold
2006 Moomba Mobius LSV - Sold
2017 Moomba Craz - Enzos, Lead
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06-25-2020, 06:56 PM #7
If I kept water flowing against the cutlass bearing and while on a fakealake, you think I could spin prop on trailer to test?
Sent from my SM-G955U using Tapatalk2008 OBV
325 EFI with closed cooling
Gravity III with 750's in the rear, 400 stock floor, 750 IBS
Servo valve ballast upgrade
Wetsounds Rev10
JL Amps, WS420BT
2000 Outback LS <-- Sold!!!
310 Carb Direct Drive
800# Rear Locker
750# IBS (should have kept this for the OBV)
Dual Batteries with 2 Bank Charger System
Kenwood Head with Remotes
Too many hours restoring exterior from prior negligence to count!
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06-25-2020, 08:00 PM #8
No. It won’t show up without it being actually in the water.
Sent from my iPhone using Tapatalk2017 Moomba Craz