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Squealing noise coming from V-Drive area? ‘18, B52, 440

Vdrive shaft allignment

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#1 Kalbluewater

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Posted 08 September 2019 - 08:25 AM

I have a loud squealing noise coming from the v-drive area, only when under big load (ballast full) when passing through or operating in the 5200-5600rpm range. It comes and goes and is absent when I am at plane in the same tpm range. Any ideas out there? I’m 7 hrs from the closest dealer.
Maybe shaft allignment out a bit. I do keep having issues with having to snug motor mounts after every day or two of surfing.

#2 Bosshog

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Posted 08 September 2019 - 07:23 PM

Shaft rubbing on thru hull

#3 oldsmobiledriver

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Posted 09 September 2019 - 04:20 AM

Dremel tool time!


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#4 mxvet

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Posted 09 September 2019 - 08:15 AM

wow full ballast and 5200+ RPM? What are you doing?


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#5 Kalbluewater

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Posted 10 September 2019 - 08:34 AM

Out of the hole when seeking up at surf speed it swings through 5200-5400 until the gps catches up and manages the speed control, usually only about5-10 seconds then settles at 5200 rpm. I imagine with the 575 it’s consideably less

#6 Kalbluewater

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Posted 10 September 2019 - 08:36 AM

Shaft rubbing on thru hull, isn’t there a sealed bearing in there?

#7 mxvet

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Posted 10 September 2019 - 09:05 AM

Not to jump subjects, but what elevation are you? Vernon BC is only 1200'? You should be surfing at 3500 - 4000 RPM at the very most.

Probably should consider re-propping if you settle at 5200.


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#8 Bowkill1

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Posted 10 September 2019 - 07:55 PM

Could be prop singing at that high of rpm. Was the prop polished? Research prop whine or prop singing? Either way it needs to be re-propped as MXVET said.

#9 Kalbluewater

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Posted 11 September 2019 - 09:35 AM

yes we are at 1200', anyone know what prop is working best at this altitude?



#10 mxvet

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Posted 11 September 2019 - 09:51 AM

yes we are at 1200', anyone know what prop is working best at this altitude?

what is on there now? 2775?


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#11 Kalbluewater

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Posted 11 September 2019 - 10:36 AM

yes, the stock 2775 is on it now



#12 mxvet

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Posted 11 September 2019 - 01:09 PM

ya, thats a high altitude prop. I would think 2247 or 2249 would work much better. 


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#13 nobij118

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Posted 11 September 2019 - 05:32 PM

I think you need more bow weight , my 17 b52 23 with a 440 and stock prop surfed at 3800 to 4200 rpms it shouldn’t be any higher than 4500 , I reproped and added 400 lbs in the bow and almost never go above 3800


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#14 Couvmerk

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Posted 13 September 2019 - 11:34 PM

My boat is similar to yours and less power (18 b52 23 with 400). Do you get the boat into gear and ease in a bit or do you just drop it ? I never see spikes like that. It almost sounds like you have either a weight distribution issue or you are ramming the throttle down so fast that the prop is blowing out .

 

Edit- i just saw the high altitude prop. Reading comprehension on a Friday night suffers.



#15 nobij118

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Posted 14 September 2019 - 09:02 AM

Another thing to check ,and this happened to me with my stock factory prop was the key broke . You may want to pull the prop and see if the key sheared like mine did. That could make the rpms spike if the prop is spinning on the shaft and not getting the power to the water


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#16 Kalbluewater

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Posted 15 September 2019 - 04:29 PM

Thanks for the ideas, I’m going to check allignment first, then pull the prop and check the key, hopefully I can get a 2247 delivered quickly. Will let you know what I find.




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