Yanmar Saildrive Corrosion - SailNet Community
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post #1 of 16 Old 06-17-2011 Thread Starter
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Yanmar Saildrive Corrosion

I have a 4Year old SD20 Sailddrive, Lake Ontario, 6 months in and out. corrosion was apparent year 1. I sanded off Yanmar paint and applied 2000E. Looks like I have to repeat every year?
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post #2 of 16 Old 06-17-2011
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I am going on my 26th season with my SD20 saildrive...
boat is in the water on a mooring 8 months a year in salt water on Long Island Sound.
I change my exterior zinc once a year and change interior
zinc as needed (not often).
Paint with outdrive paint every year.
No evidence of corrosion.
Do you change zincs?/ Do your zincs corrode?
Are you in a slip or a mooring?
Any of your neighbors experiencing similiar corrosion problems?
Have you had the boats electrical system checked for
stray current?
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post #3 of 16 Old 06-22-2011 Thread Starter
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Sd20

You are lucky. Mine is in fresh water, Zinc but will change to Magnesium, 6 month in/out, none nearby.
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post #4 of 16 Old 04-19-2012
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Angry Re: Yanmar Saildrive Corrosion

I have an SD20 and dip it in Lake Ontario for several months a year too. I noticed corrosion the first haulout. I replaced the anode with a magnesium material. I don't think it's getting any worse and I am currently going to look into someone paying for redoing the saildrive corrosion fix-up. The magnesium anode only lasts one season and it appears to be done. The original that came with the boat looked new after one season. I suspect it was the wrong type for fresh water. I don't think I should have to pay for someone elses mistake.
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post #5 of 16 Old 04-19-2012
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Re: Yanmar Saildrive Corrosion

Seems that Lake Ontario is eating up SD20's...
Point of information...there is an interior anode on
the side of the saildrive in addition to the lower exterior one.
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post #6 of 16 Old 10-02-2013
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Re: Yanmar Saildrive Corrosion

Update on my saildrive. I have been replacing the anode with a magnesium material for the last several years. This gets replaced every year. My saildrive still looks like the day I epoxied it. Problem solved. I purchase them in bulkfrom Boatzincs.com in 5 year batches
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post #7 of 16 Old 10-02-2013
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Re: Yanmar Saildrive Corrosion

Year 5 for me, also in Western Long Island Sound. I've done the epoxy coating twice, and each year it gets painted with bottom paint (Pettit Vivid). This is the first year I did not swap out the exterior zinc, as last year's looked only about 20% used at most. Hauling in two weeks and will be interested to see how it looks. Changed the interior zinc this past winter for the second time. Have never had any problems. Boatzincs is good.
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post #8 of 16 Old 10-04-2013
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Re: Yanmar Saildrive Corrosion

I installed a galvanic isolator after previously using a "guppy" to help the zincs last between haulouts every other year . Isolator does the job, guppies didn't.
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post #9 of 16 Old 10-04-2013
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Re: Yanmar Saildrive Corrosion

I have been in every marina on Lake Ontario and many of them have 40 year old shore power wiring.

Remember that when you plug into shore power you are plugging in to every one else problems. Sail drives and I/O's are the most susceptible to galvanic or stray current corrosion because of the several different metals in their construction.

A galvanic isolator is an inexpensive and easily installed piece of equipment that should be your first line of defence after switching to magnesium anodes.
the isolator effectively isolates you from bad shore power wiring and the wonky electrical systems of your neighbours.

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post #10 of 16 Old 10-04-2013
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Re: Yanmar Saildrive Corrosion

In addition to changing zincs, I attribute long life and lack of
corrosion on my SD 20 saildrive to boat living on a mooring,
anchoring when away from home with very few stays at marinas over the years but never plugging in to shore power.
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