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Old 01-28-2018, 11:27 AM   #1
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Thruster Zinc Removal

My Side Power thruster has two zincs. They're mounted at the ends of the drive shaft. They mount over the prop retaining nut and within a small lip on the prop. There is a single allen bolt through the zinc.

Removing the zincs for replacement the first year was a nightmare. The allen bolts came out fine, but corrosion/wastege had bound the zincs firmly to both the prop and the retaining nut. There was no good way to get access to pry them out.

I tried drilling out pieces (while trying not to drill the prop or nut). I tried grinding and cutting. I tried running a screw into the zinc and pulling -- which had me fly backwards about 3 feet and land on my rump with the zinc still in-place. Nothing seemed to work well. I think after a few hours I finally drilled/ground out enough pieces to pry the remaining fragments out.

Thought about this over the next year and had a new approach to try.

1. Remove the allen bolt.
2. Drill a small hole off-center in the zinc. Don't go too deep.
3. Run some type of screw a few threads-deep into the hole. I use a thin course-thread screw like a decking or drywall screw.
4. Grab the screw head with a slide hammer and give it a pop.

What was interesting about this plan was that it actually worked like a charm. Removing those zincs is now a 5 minute task with no cursing.
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Old 01-28-2018, 11:35 AM   #2
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Nice tip. I have a Side Power stern thruster that I installed last year that will need a new anode in the spring. Will keep this in mind.

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Old 01-28-2018, 03:00 PM   #3
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If you put a tiny dab of Kopr-Shield on the back side the anode will not stick to the nut.
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Old 01-28-2018, 07:10 PM   #4
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Originally Posted by tadhana View Post
If you put a tiny dab of Kopr-Shield on the back side the anode will not stick to the nut.
This, or any other anti-seize. Lucky me, I got taught this lesson before I needed it.

"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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Old 01-28-2018, 08:30 PM   #5
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I am assuming this is an out of the water procedure. What about the diver getting them out?
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