Beneteau Antares prop anode

[Timsuttle]

Will my 1999 beneteau Antares 710 have a prop anode?
thanks.

 

[Jamie Dundee]

It will either have a prop anode or a shaft anode. My 760 has one of these Beneteau type zinc anodes for conical propeller nut. Shaft sizes 22mm to 60mm

 

[Timsuttle]

Thank you Jamie.
how often should they be changed?
And what happens if they aren’t changed in time? My boat is in the water so will have to put it on the drying grid to have a look.

 

[Tranona]

Change when eroded more than 50% so you need to physically check. If eroded completely then prop is no longer protected from galvanic action with the shaft and may dezincify. Best not to let that happen!

 

[Timsuttle]

Change when eroded more than 50% so you need to physically check. If eroded completely then prop is no longer protected from galvanic action with the shaft and may dezincify. Best not to let that happen!

Thank you

 

[Jamie Dundee]

Thank you Jamie.
how often should they be changed?
And what happens if they aren’t changed in time? My boat is in the water so will have to put it on the drying grid to have a look.

If you have the cone type be aware they do fall off from time to time. Mine did last year, this year I put a dab of Sikaflex on the screw to prevent the anode eroding where it is screwed to the shaft. Given how quickly my anodes erode I would guess 6 months or less of no protection would cause big problems with the prop and steering gear.

 

[Timsuttle]

If you have the cone type be aware they do fall off from time to time. Mine did last year, this year I put a dab of Sikaflex on the screw to prevent the anode eroding where it is screwed to the shaft. Given how quickly my anodes erode I would guess 6 months or less of no protection would cause big problems with the prop and steering gear.

Thank you Jamie you wouldn’t know where I could find what size the prop shaft is do you?

 

[Jamie Dundee]

Thank you Jamie you wouldn’t know where I could find what size the prop shaft is do you?

No idea, other than measuring it. Mine is 40mm on a 200hp engine so yours likely to be less if you’re on a ~150 ish. Try a post on the motorboat forum Motor Boat Forum

 

[Timsuttle]

No idea, other than measuring it. Mine is 40mm on a 200hp engine so yours likely to be less if you’re on a ~150 ish. Try a post on the motorboat forum Motor Boat Forum

Thank you Jamie. The slightly new ones with 150 HP use 35mm but my boat has a smaller engine of 115HP

 

[Plum]

Thank you Jamie. The slightly new ones with 150 HP use 35mm but my boat has a smaller engine of 115HP

You can measure the shaft diameter inside the boat.

 

[Plum]

If you have the cone type be aware they do fall off from time to time. Mine did last year, this year I put a dab of Sikaflex on the screw to prevent the anode eroding where it is screwed to the shaft. Given how quickly my anodes erode I would guess 6 months or less of no protection would cause big problems with the prop and steering gear.

Good idea. I do the same to get the best life out of the conical anode that fits over the prop nut. After tightening up the screw I completely fill the recess/counterbore with silicone mastic, not sikaflex as it sticks too well and will make it hard work to remove to remove the screw. The mastic in the counterbore stops the anode from eroding around/under the screw head which leads to the anode spinning on the screw which then leads to the screw loosening. This has stopped me loosing anodes before they have done their job.


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