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Anodes

Skykomish E29 12:28pm, 14 November 2010
Hi guys, probably one for Neil.
I was giving some thought to the need for anodes on my boat. (there are none as such only one fitted to the water cooling on the engine).
I do not use shore power and was told if I don't use this I really didn't need to worry.
There is very little room to fit anything to the prop shaft as she is a long keeler with rudder attached aft of the keel (like a Twister).
I probably don't need to worry as the boat was built in 1964 and has never had external anodes fitted, it was just after reading an old magazine I the fears of corroding propshaft and prop crept into the mind and started niggling away.

One thing that I did notice was that the bolts holding the exhaust outlet to the heatexchanger have had a nasty effect on the casting (aluminium) and will at some stage need re threading. (This is a Beta engine which was new about 4 years ago) Certainly one of the bolts has seized to the exchanger housing and will need some persuasion to remove, the head already having broken off.

Any thoughts guys.
songeur2010 8 years ago
My keel has all kinds of of deep corrosion, probably due to fact that the zinc anode had completely gone. Songeur had a small one on the prop shaft which had partly corroded away, I will definitely be putting one back on the keel and the prop shaft, much better safe than sorry.
Skykomish E29 8 years ago
Fortunately I have an encapsulated keel so that bit is not a problem. My main worry is the propshaft and prop. Have to say Aeolus didn't have an anode on the keel just the outboard, and whereas each time she was hauled out there was superficial surface rust, there was no real serious corrosion
Andrew Curry Posted 8 years ago. Edited by Andrew Curry (member) 8 years ago
Take a look at the attached link. Page 14 shows were the anode is on the beta heat exchanger. www.bluemoment.com/manuals/BZ482_manual.pdf
From what ive been told they will eat one of these in a season.

To protect your shaft and prop you could use one of these www.asap-supplies.com/marine/electro-eliminators
to run on the shaft and attach it to a hanging anode
Skykomish E29 8 years ago
Yes I can believe that Andrew, I have several Anodes that came with the boat from the Beta Engine and there isn't much left of any of them!

Thanks for the info
Andrew Curry 8 years ago
The Beta is a great engine. It would be my choice if i had a boat with a inboard.
sailing bye1 8 years ago
I have 2 fitted on my Yanmar inboard as well as the prop shaft and hull. I only found the 2 on the engine this spring after noticing a build up of a white powder where the 4 bolts hold down a small cover over the anode at the rear of the engine.
Snoopy463 8 years ago
Better check my Beta engine this year then! THe anode on Snoopys prop shaft has been changed every year since the engine was installed but not looked at that one for a while.
rothwell_neil 8 years ago
So long as the anode is electrically connected to the item you want to protect you will be fine as the conductivity of the seawater means you get a full circuit.
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