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01-19-2012, 04:44 AM
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#1
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Scraping Paint
Join Date: Nov 2007
Posts: 131
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stern tube corrosion prevention,
I know that most members own fiberglass boats but anayway:
How do you prevent corrosion in a steel sterntube?
What is the best practice?
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01-19-2012, 06:18 AM
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#2
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,148
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RE: stern tube corrosion prevention,
Quote:
Singleprop wrote:
I know that most members own fiberglass boats but anayway:
How do you prevent corrosion in a steel sterntube?
What is the best practice?
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*Even us fiberglass guys sometimes have stainless or bronze stern tubes.
Mine's stainless and I've been advised that it's a bitc* to get out so keeping it good is my best solution.* I'm hoping bonding will keep her...but eventually it may rust through.
My guess it's about the same for you but maybe there's a trick*for a steel boat I don't know of.
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01-19-2012, 09:16 AM
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#3
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Guru
City: Hailing Port: Charleston, SC
Vessel Name: Moonstruck
Vessel Model: Sabre 42 Hardtop Express
Join Date: Nov 2008
Posts: 8,276
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RE: stern tube corrosion prevention,
Don't know how much this helps the stern tube, but my shafts are bonded through carbon brushes attached to a copper strap. *The strap has spring tension that holds the brushes in contact with the shafts. *The brushes have to be replaced when worn.
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01-19-2012, 10:57 AM
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#4
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Guru
City: Everett Wa
Vessel Name: Eagle
Vessel Model: Roughwater 58 pilot house
Join Date: Oct 2007
Posts: 2,919
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RE: stern tube corrosion prevention,
I dont know/see how you can protect the tube as its usually encased in, wood, cement, fiberglass, in the keel.* I asked and they said if they could not slide the old tube out, then they would slip/slide a new tube inside of the old tube? However, if its incased in cement/fiberglass you would not know if it did fail until is started to leak/drip?*
*
I
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01-19-2012, 11:26 AM
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#5
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,148
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RE: stern tube corrosion prevention,
Quote:
Phil Fill wrote:I dont know/see how you can protect the tube as its usually encased in, wood, cement, fiberglass, in the keel.* I asked and they said if they could not slide the old tube out, then they would slip/slide a new tube inside of the old tube? However, if its incased in cement/fiberglass you would not know if it did fail until is started to leak/drip?*
*
I
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*By bonding and pulling out the shaft and cleaning any muck that settles in there are the two I'm paying close attention to.
Slipping a new tube in may not always be possible because of close tolerances...the old one*may have to come out.
And yes, when they fail, a lot of owners have unaccounted for leaks that are only narrowed down to the shaft tube when all other sources have been elininated or when on the hard and water is noticed coming out the rear cutlass bearing from bilge water seeping back into the keel area.
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01-19-2012, 01:08 PM
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#6
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Guru
City: Thibodaux, Louisiana
Vessel Name: Gumbo
Vessel Model: 2003 Monk 36
Join Date: Oct 2007
Posts: 3,882
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RE: stern tube corrosion prevention,
Mine is coated with what appears to be epoxy maybe 1/16" thick, near the shaft seal a dime sized portion of the epoxy was filed off exposing the SS tube. A connection to
the bonding system is made there. The bonding wire is held in place by a hose clamp.
Steve W.
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01-20-2012, 08:18 AM
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#7
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Guru
City: Chocowinity NC
Vessel Name: My Yuki
Vessel Model: 1973 Marine Trader 34
Join Date: Nov 2007
Posts: 637
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RE: stern tube corrosion prevention,
I had mine replaced 3 years ago with stainless, (you're right, finding the source of leaks into the bilge was a bit**). I have heard of f/glass being a preferred solution today.
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