anode placement - outboard shaft - SailNet Community

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Old 09-11-2007
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anode placement - outboard shaft

Hello,

A friend of mine who is a diver is going to replace the zinc anode on the shaft of my Catalina 27.

He is not familiar with boats, and the last time it was the "yard" that did the replacement in a lift (and regretably I didn't get a picture to use as a reference).

Where should I tell him to place the anode; middle of the shaft? closer to the strut?

Also, does anyone happen to know what the shaft diameter might be? (Farymann 12 hp diesel)

Thanks,

Angus
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Have your friend remove the old zinc and put the replacement where the old one was. Not sure of shaft diameter. Make sure that the zinc is placed metal to metal and not over any painted or treated surface.
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As close to the Prop as possible.
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You should be able to see the shaft in the bilge before it goes through the stuffing box. Measure there.
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I agree with Cam that it should be as close to the prop as possible, since it is mainly there to protect the prop. Has to be on clean bare metal or it won't work properly.
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And don't forget to 'hammer' it securely onto the shaft to make good contact...a voice of experience.
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Quote:
Originally Posted by bhcva View Post
And don't forget to 'hammer' it securely onto the shaft to make good contact...a voice of experience.
Going to have to depend on the screws to fasten it tightly, since he's having a diver install it... using a hammer under water is a bit difficult.
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SD,
A shaft zinc should always be hammered - to seat the two halves against the shaft - after hand tightening the set screws. You then tighten the screws some more.
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TB-
How do you hammer under water??? He's having a diver install the zinc in-situ with the boat in the water.
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I use a poly hammer with a lanyard, been doing it that way for years. I also use a hex-tool with a screw-driver handle - also on a lanyard. Both lanyards are clipped to my BC (bouyancy compensator) D-rings by carabiners.
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