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Old 12-06-2020, 04:54 PM   #1
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Yanmar 6LY zincs, or lack of..

I guess 7 months was too long....Click image for larger version

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Old 12-06-2020, 05:33 PM   #2
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If your boat's external zincs were wasting at that rate, I would say you have a DC leak to the boat's bonding system that was eating up the zincs. But internal engine zincs wasting that fast, I don't know what to say. I do know it is not normal.

Could you have acid flushed the engine during that period without first removing the zincs. That would do it.

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Old 12-06-2020, 07:32 PM   #3
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Actually 2 of these were broken off in the threaded shaft....I wish someone made pencil zincs that didn't break off and potentially block water flow....I guess they will eventually do what they are designed to do, erode away...
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Old 12-06-2020, 08:27 PM   #4
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Actually 2 of these were broken off in the threaded shaft....I wish someone made pencil zincs that didn't break off and potentially block water flow....I guess they will eventually do what they are designed to do, erode away...
Take a look at Performance Metals anodes. They have a steel wire in the center of the zinc / alum pencil that significantly reduces breakage. I had several breaks before switching and now only rarely.
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Old 12-06-2020, 09:43 PM   #5
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Just finished up my winterizing today and had a similar issue. I encountered zinc mush when the head came off deep on the front of the intercooler where I am sure the prior boat yard never changed (180hrs on motor). Anyway I used a small shop vac attachment and sucked out the debris.

I would agree that you should check your new zincs on a tighter schedule to see what the true rate of wear is.
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Old 12-06-2020, 09:58 PM   #6
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Do you have a web site you order from?..link?
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Old 12-06-2020, 11:19 PM   #7
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https://performancemetals.com/pages/navalloy-aluminum-anodes
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Old 12-07-2020, 08:40 AM   #8
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Do you have a web site you order from?..link?
They sell through dealers. When I called them they said OK to order direct as no dealers in my immediate area.
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Old 12-07-2020, 10:50 AM   #9
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Looks good...here is some info they sent...
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File Type: pdf Aluminum Anodes.pdf (224.3 KB, 6 views)
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