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TOPIC: Shaft Noise

Shaft Noise 01 Oct 2017 16:19 #1

  • Checks Five-Oh
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3988 with Cummins. Noticing a "wining/whistle" like noise when I slip the port engine into gear and a vibration above 1800rpm. Does anyone know the symptoms of a cutlass bearing beginning to wear?
Thanks

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Shaft Noise 01 Oct 2017 18:22 #2

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Re-align the shaft in the water, then check for the whine, if it still makes noise could be cutlass or a transmission bearing or gear, or shaft packing which the shaft may ride on the packing nut.
After checking the packing and the noise persists, then disconnect the shaft and back it out enough to clear the transmission and check for play in the output bearing.
If there is no play in the transmission bearing then that leaves the cutlass bearing.
I do not know if you can run the transmission disconnected from the shaft to check for noise!

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Shaft Noise 01 Oct 2017 19:08 #3

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Thanks for the response. Not sure how to check the alignment in the water. That is beyond my scope I think. I suspect I would need a shaft gauge if there is such a thing.

I have a drip-less system that was installed prior to purchase. Therefore I am not sure what the stuffing box set up is.

Good idea of disconnecting the shaft to rule out the transmission.
Greatly appreciate your input here.

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Shaft Noise 01 Oct 2017 21:42 #4

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This video discusses various alignment issues and fixes. Hope it helps.

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Shaft Noise 01 Oct 2017 22:33 #5

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Checks Five-Oh wrote: Thanks for the response. Not sure how to check the alignment in the water. That is beyond my scope I think. I suspect I would need a shaft gauge if there is such a thing.

I have a drip-less system that was installed prior to purchase. Therefore I am not sure what the stuffing box set up is.

Good idea of disconnecting the shaft to rule out the transmission.
Greatly appreciate your input here.


The final alignment should only be in the water!
That hull will move once in the water!

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Shaft Noise 01 Oct 2017 22:36 #6

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Checks Five-Oh wrote: Thanks for the response. Not sure how to check the alignment in the water. That is beyond my scope I think. I suspect I would need a shaft gauge if there is such a thing.

I have a drip-less system that was installed prior to purchase. Therefore I am not sure what the stuffing box set up is.

Good idea of disconnecting the shaft to rule out the transmission.
Greatly appreciate your input here.


You do not have a packing gland with the dripless system on your shaft.

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Shaft Noise 02 Oct 2017 09:44 #7

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Good question to which I do not have an answer. Not even sure how I would find out.

K/r.

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Shaft Noise 02 Oct 2017 12:24 #8

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Checks Five -Oh
re shaft whine
Just a thought but this past summer I had similar whine on port engine only
It only happened wnen going forward and only port engine and only at higher RPM
Turns out it was just the shaft zinc on port shaft .Simple adjustment and all was well
If you have shaft zincs engine room check it out
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Shaft Noise 03 Oct 2017 02:21 #9

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If you have a bonding shaft wipe between the coupling and the packing that may be the issue, I found that out on my 3870 this year.
If so clean the shaft and wipe, I also took some very fine emery cloth and touched up the shaft and the wipe.
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Shaft Noise 03 Oct 2017 20:29 #10

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boatworkfl wrote: If you have a bonding shaft wipe between the coupling and the packing that may be the issue, I found that out on my 3870 this year.
If so clean the shaft and wipe, I also took some very fine emery cloth and touched up the shaft and the wipe.


Just curious...what is a shaft wipe?

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Shaft Noise 03 Oct 2017 23:30 #11

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diveguy wrote:

boatworkfl wrote: If you have a bonding shaft wipe between the coupling and the packing that may be the issue, I found that out on my 3870 this year.
If so clean the shaft and wipe, I also took some very fine emery cloth and touched up the shaft and the wipe.


Just curious...what is a shaft wipe?


It is a bonding device, like a brush on an electric motor, usually made of metal though, an arm with tension holds it to the shaft and is connected to your bonding system.

I have them on my 3870, sometimes they squeak so I clean the shaft with a SS brush and it is ready to go.

www.google.com/url?sa=t&rct=j&q=&esrc=s&...oD0QyRHI0nnMLu-Y7SrN
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Shaft Noise 04 Oct 2017 00:10 #12

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diveguy wrote:

boatworkfl wrote: If you have a bonding shaft wipe between the coupling and the packing that may be the issue, I found that out on my 3870 this year.
If so clean the shaft and wipe, I also took some very fine emery cloth and touched up the shaft and the wipe.


Just curious...what is a shaft wipe?


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Shaft Noise 04 Oct 2017 01:06 #13

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That’s what I call it.

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Shaft Noise 04 Oct 2017 08:59 #14

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Oh ok. I Never saw those before. So with a shaft wipe connected or bonded to the hull Anode, I assume, you would not need shaft zincs?

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Shaft Noise 04 Oct 2017 13:56 #15

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diveguy wrote: Oh ok. I Never saw those before. So with a shaft wipe connected or bonded to the hull Anode, I assume, you would not need shaft zincs?


The shaft wipe is there to complete and equalize the bonding of all the protected under water metal, even though the shaft is connected through the coupling, when measured there is a slight difference with-out the shaft wipe.
You do not want the electrical bonding field to go directly through the bearings in the transmission.

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Shaft Noise 04 Oct 2017 15:46 #16

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So, does he need the shaft zincs or not? Btw, I have both shaft zincs and wipers.

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Shaft Noise 04 Oct 2017 18:39 #17

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Yes he still needs shaft zincs, the shaft wipe just equalizes the potential across all of the under water metal, just as your transom zinc is connected to your trim tabs and rudders.
The rudders should have bonding wires connected to the rudder shaft inside the hull as well as the rudder mount the shaft goes through.

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Shaft Noise 04 Oct 2017 19:08 #18

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Shaft brushes are usually used to reduce or eliminate noise in a radio or other electronics caused by the shaft being at a different electrical potential than the rest of the bonding system.

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Shaft Noise 05 Oct 2017 02:18 #19

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Norton Rider wrote: Shaft brushes are usually used to reduce or eliminate noise in a radio or other electronics caused by the shaft being at a different electrical potential than the rest of the bonding system.


Usually, but not the only reason!
I had no electrical issues with my electronics or radio prior to installing a shaft wipe, that being said-All my zincs now last longer.
Biggest issue is a boat near you that is not well bonded can raise havoc with a well bonded vessels zincs and underwater metal.

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