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Anodes (Read 3896 times)
Justin
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Anodes
23.10.2016 at 18:21:42
 
I've recovered Harlequin for the winter as I decided I had quite a lot that I wanted to do and didn't want to have to feel under pressure to get it done quickly.

Could I have some advice on anodes, please?

I have a small wire going from the engine to one of the keels.  I don't have a hull anode but I do have a shaft anode which is reasonably pitted at the end of the season. It is a zinc one and I gather that a mix of aluminium and zinc is better if the boat is to spend time in freshwater.  The boat has spent the first month of the season in freshwater, about two and a half months in salt water and the last three months mainly in freshwater.

What do you all have in the way of anodes and how are they wired?

Thanks

Justin Undecided
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Andy
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Re: Anodes
Reply #1 - 24.10.2016 at 21:19:19
 
I just have shaft anode and built in engine anode on "Crazy Horse". No wired anode. At the end of the day the anode is there to protect the prop, shaft and engine so on a small boat like the 300 a regular shaft anode is sufficient to protect the shaft and prop but obviously does not protect the engine which is why a lot of engines have a built in anode somewhere. I know my YSB8 does.
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Justin
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Re: Anodes
Reply #2 - 24.10.2016 at 22:25:15
 
Harlequin has a shaft anode and engine cooling system internal anode.  Engine is a 1GM10.

There is a wire from the engine to one of the keels!
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John Woodhouse
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Re: Anodes
Reply #3 - 25.10.2016 at 07:37:59
 
Anodes on ST - salt water:

internal on engine - Yanmar 1GM10
prop shaft
P bracket
anode on wire over the side when moored, connected to P bracket bolts

First three changed annually
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Paul G
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Re: Anodes
Reply #4 - 25.10.2016 at 08:20:05
 
Anode on the shaft and another on the engine (YSM8)

Jasta is being hauled out Friday for a month of maintenance so will be interesting if the anodes have eroded after 5 months in the water

On the to do list is full bottom strip and recoat, seacock service and a new propshaft
Messy work for the next month!

Paul
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Justin
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Re: Anodes
Reply #5 - 25.10.2016 at 10:43:57
 
Someone told me that all the metal skinfittings should be wired to the anodes!)
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John Woodhouse
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Re: Anodes
Reply #6 - 25.10.2016 at 15:58:54
 
Paul G wrote on 25.10.2016 at 08:20:05:
Anode on the shaft and another on the engine (YSM8)

Jasta is being hauled out Friday for a month of maintenance so will be interesting if the anodes have eroded after 5 months in the water


Paul


hi Paul, ST has always lived at Deacons & eats anodes with alacrity.
I will be interested in how Jasta has fared. I have always put it down to seawater conducting electricity & all those boats in the vicinity connected to  the mains - stray current & all that. I am no expert, simply prudent!
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Andy
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Re: Anodes
Reply #7 - 25.10.2016 at 19:29:48
 
If skin fittings or seacocks are of a suitable material, glass reinforced nylon ( Marelon), bronze or even dezincification resistant brass, they should not need cathodic protection. Stern gear is the equipment most likely to suffer because of the mix of metals which is why props and shafts and stern tubes often need an anode, either directly or through bonding to a hull mounted anode.

So as a simple answer there is no need to bond skin fittings to a hull anode.
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John Woodhouse
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Re: Anodes
Reply #8 - 25.10.2016 at 19:47:36
 
Andy wrote on 25.10.2016 at 19:29:48:
So as a simple answer there is no need to bond skin fittings to a hull anode.


This coincides with my experience
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Paul G
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Re: Anodes
Reply #9 - 25.10.2016 at 19:55:31
 
Hi John, we shall see what horrors await then!
She will be on the side from Friday, feel free to have a look.
I'll be under her scraping antifoul from Sunday Sad
Paul
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John Woodhouse
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Re: Anodes
Reply #10 - 26.10.2016 at 08:18:59
 
Paul G wrote on 25.10.2016 at 19:55:31:
Hi John, we shall see what horrors await then!
She will be on the side from Friday, feel free to have a look.
I'll be under her scraping antifoul from Sunday Sad
Paul


Thanks Paul. Due out Thursday, back Friday. Will take a dekko.
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Justin
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Re: Anodes
Reply #11 - 30.10.2016 at 16:04:27
 
Does anyone have a wire from the engine earthed to a keel?
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John Woodhouse
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Re: Anodes
Reply #12 - 30.10.2016 at 16:47:25
 
Justin - for what purpose?..........John
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Justin
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Re: Anodes
Reply #13 - 30.10.2016 at 17:23:46
 
I've no idea but that is what I've got.  It looks like one of my keels is being used as a big anode!

How should the engine be earthed?

Although I've rewired the entire domestic side of the boat I've not touched the engine electrical side.

I have a 240v consumer unit to which I have plugged a halfords smart charger connected to the one battery.  I also have a solar panel connected to the battery.

I plan to put a leisure battery on board with a simple off, 1, 2, both switch and a second solar panel with regulator.

Apart from connecting the new solar panel with regulator to the new battery, I simply intend to link the new battery to the 2 stud on the switch and the negative earth busbar and put the positive from the existing battery to the 1 stud of the switch and transfer the old switchpanel positive cable from the old on/off isolator switch to the common stud on the new switch.  I'd also move the automatic bilge pump to the new leisure battery from the existing single battery.

Does this make sense?  Should I disconnect wire from engine to keel?
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« Last Edit: 30.10.2016 at 17:44:55 by Justin »  
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John Woodhouse
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Re: Anodes
Reply #14 - 30.10.2016 at 21:28:06
 
Hi Justin - so you have a bilge keeler? I believe only two T300 b/k's were made.
I am afraid I cannot answer your earthing question. On ST the battery negative terminals are bolted to the gearbox bell housing & that's it. There are no connections to the keel. Could yours be a grounding route in case of lightening strike?
Re charging, I normally leave the wind generator switched through to the service battery. I stop it rotating if connected to shore power for any length of time.
John
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