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N30 Propeller corrosion

Diver reports my propeller has some bad corrosion on my 1983 N30 MKIII. (Universal 5416)

Options? or is replacement my only option? If so, how about replacement options/sources.

"Amateur hour" question: I'm in SoCal so she's in the water all year. For service or replacement does it need to be hauled out or can a diver remove/replace.

I ask because I'm going to be away for a bit (son's getting out of the Navy, driving with him back cross country) so it would be a great time to get this done while I'm away, not using her.

Thanks in advance.
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post #2 of 10 Old 03-16-2016
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Re: N30 Propeller corrosion

Yes a diver should be able to replace, and if you keep your boat in the water year round, perhaps it is time to have it pulled out and bottom job done, and replace it then? Be sure your zincs are replaced at least once a year, that should keep corrosion down. Are you at a mooring or a slip? Generally slips have more potential for corrosion because of all the boats plugged into shore power. You should also have your marina checked for stray currant and have your own boats electrical system checked for stray current. Stray current is the cause of most corrosion issues, and the depletion of zincs. Installing a isolator may help as well. When was the last time she had bottom work done, and zincs changed?

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Re: N30 Propeller corrosion

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Originally Posted by miatapaul View Post
Yes a diver should be able to replace, and if you keep your boat in the water year round, perhaps it is time to have it pulled out and bottom job done, and replace it then? Be sure your zincs are replaced at least once a year, that should keep corrosion down. Are you at a mooring or a slip? Generally slips have more potential for corrosion because of all the boats plugged into shore power. You should also have your marina checked for stray currant and have your own boats electrical system checked for stray current. Stray current is the cause of most corrosion issues, and the depletion of zincs. Installing a isolator may help as well. When was the last time she had bottom work done, and zincs changed?
The bottom paint is fair (2012) and I was hoping to get through this summer before needing it done again. The shaft zinc was replaced when this prop corrosion was reported to me (I changed divers and they did an initial u/w inspection). She's in a marina.
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Re: N30 Propeller corrosion

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The bottom paint is fair (2012) and I was hoping to get through this summer before needing it done again. The shaft zinc was replaced when this prop corrosion was reported to me (I changed divers and they did an initial u/w inspection). She's in a marina.
Well a paint job from 2012 is a couple of years overdue. I would be concerned about thru-hulls as they are likely gone too, along with the shaft and any other metal that contacts the water. my suggestion would be to have her pulled and all below water fittings at least evaluated if not replaced out of a sense of caution. Three years is a long time for bottom paint, let alone 4. But if the prop is corroded, it likely is not the only thing. How are your seacocks, any corrosion, and are they seacocks or at least marine ball valves? It would stink to go away for your sons celebratory drive across the country (thank him for me for his service by the way!) and come back to a boat that has sunk. Again thank your son!

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Re: N30 Propeller corrosion

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Originally Posted by miatapaul View Post
Well a paint job from 2012 is a couple of years overdue. I would be concerned about thru-hulls as they are likely gone too, along with the shaft and any other metal that contacts the water. my suggestion would be to have her pulled and all below water fittings at least evaluated if not replaced out of a sense of caution. Three years is a long time for bottom paint, let alone 4. But if the prop is corroded, it likely is not the only thing. How are your seacocks, any corrosion, and are they seacocks or at least marine ball valves? It would stink to go away for your sons celebratory drive across the country (thank him for me for his service by the way!) and come back to a boat that has sunk. Again thank your son!
Fair points. I'm really looking for sources for a new propeller should I need one. Hauling her out while I'm gone is not a bad idea. P.S. I'll pass along your thanks.
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post #6 of 10 Old 03-17-2016
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Re: N30 Propeller corrosion

Take it from a hull diver with more than 21 years in the biz- everything miatapaul said is spot on.
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Re: N30 Propeller corrosion

Hauling her out and getting the bottom painted, inspected & prop done is the path I'll follow. Getting quotes. Thanks for advice.
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post #8 of 10 Old 08-29-2016
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Re: N30 Propeller corrosion

I ran across this thread researching the exact same problem I am having on a Newport of the exact same year and model. What ended up being the outcome? And can you share with me what propellor company you may have used? I am leaning towards Martec but they are pricey! Any advice would be appreciated!
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post #9 of 10 Old 08-29-2016
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Re: N30 Propeller corrosion

Agree with everything Miata said but I'd go a little further .... An electrical inspection would also be worthwhile, Galvanic corrosion or possibly stray current corrosion can be serious issues. Find an electrician with an ABYC Corrosion Analysis certificate and don't hire anyone who refers to it as "electrolysis".

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post #10 of 10 Old 08-29-2016
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Re: N30 Propeller corrosion

Its important to check zincs regularly checking and changing right as a problem is noticed is not enough. In fairness this was the OPs comments not yours but worth mentioning. Look up dezincification (sp) of bronze fittings.
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