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03-24-2021, 01:44 PM
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#1
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Senior Member
City: San Francisco
Vessel Name: Couple’s Retreat
Vessel Model: 2019 North Pacific 45
Join Date: Aug 2014
Posts: 463
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Shaft brush noise
Howdy, my shaft brush is making a noise that’s a bit annoying. Has anyone applied conductive grease, e.g rectorseal? Any thoughts?
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03-24-2021, 04:17 PM
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#2
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,785
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First, do you really need a shaft brush. They are commonly used to ground the prop shaft to the bonding system. But unless you have a Drive Saver or similar, the shaft has electrical continuity through the transmission to the engine and the engine block is usually connected to the bonding system.
But you might try a conductive grease like this stuff: https://www.amazon.com/MG-Chemicals-.../dp/B00SMRNSR0
David
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03-24-2021, 04:24 PM
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#3
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Senior Member
City: Seattle, WA
Vessel Name: Akeeva
Vessel Model: Nordhavn 50
Join Date: Apr 2014
Posts: 449
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I had the same problem and got rid of the shaft brush and added a zinc on the prop shaft. Much quieter and no corrosion problems!
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03-24-2021, 05:27 PM
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#4
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,186
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Quote:
Originally Posted by Retriever
I had the same problem and got rid of the shaft brush and added a zinc on the prop shaft. Much quieter and no corrosion problems!
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+1 on the shaft anode and no brush. Much less maintenance other than changing the anode.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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03-24-2021, 06:34 PM
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#5
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Senior Member
City: San Francisco
Vessel Name: Couple’s Retreat
Vessel Model: 2019 North Pacific 45
Join Date: Aug 2014
Posts: 463
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I do have an anode on the shaft as well. I just might try some conductive grease first.
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03-25-2021, 01:07 AM
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#6
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Guru
City: Gulf Islands, BC Canada
Vessel Name: Sea Sanctuary
Vessel Model: Bayliner 4588
Join Date: Jul 2019
Posts: 5,017
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I have a drive saver, shaft brush bonded to Transom zinc and shaft zinc. The latter, shaft zinc I scratch my head whether it is needed.
If the brushes make a noise I cannot hear it.
__________________
SteveK
You only need one working engine. That is why I have two.
Sea Sanctuary-new to me 1992 Bayliner 4588
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03-25-2021, 02:40 AM
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#7
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Senior Member
City: Poulsbo
Vessel Name: Water Music
Vessel Model: Grand Banks 49 classic
Join Date: Jun 2015
Posts: 221
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I have shaft bonding bushing on both shafts. They are mounted from the same side with the shafts rotating in opposite directions, One squeals, one is quite. The one pushing against the flat spring mounting squeals and with a light coating of grease is quiet. The other which is pulled rather than pushing never squeals. They both are electrically conductive when measured with a VOM.
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03-25-2021, 07:29 AM
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#8
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Guru
City: Narragansett Bay
Vessel Model: Grand Banks 36 Classic #715
Join Date: Sep 2016
Posts: 1,857
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If you have a drive saver just add a jumper wire that connects the two sides of coupling. No brush or zinc needed.
__________________
Carl
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