Odd anode damage.

Nos4r2 · 01 October 2008, 19:35

Anyone seen anything like this before? There's practically no fur on the anode but it looks like someone's been shooting it. It's on my motor-been like it for a while but only just took a pic.

m chappelow · 01 October 2008, 19:51

could it have had copper slip lubricant used on it at sometime .or been stood touching a damp coil of rope thats been in sea water or a prop bag,

Nos4r2 · 01 October 2008, 19:57

Quote:

Originally Posted by m chappelow

could it have had copper slip lubricant used on it at sometime .or been stood touching a damp coil of rope thats been in sea water or a prop bag,

No evidence of coppaslip anywhere on the motor, and I don't know about the rest but certainly not in the last 2 years.

m chappelow · 01 October 2008, 20:05

how about electrical leakage from somewhere on the engine ,or a redundent wire passing current and touching the casing ,.at least its doing its job its better corroding on the anode than the gear box .

Nos4r2 · 01 October 2008, 20:06

Quote:

Originally Posted by m chappelow

how about electrical leakage from somewhere on the engine ,or a redundent wire passing current and touching the casing ,.

Nothing like that either!

I wondered if it was a dodgy anode but Doggypaddle's 80 Yam is the same.

jwalker · 01 October 2008, 20:23

Often, if there is impurity within the metal, a small cell is produced between the impurity and the parent metal. Corrosion is obviously greater by galvanic activity in the region of the impurity. It can inadvertently be caused by scrubbing the anode clean using a wire brush.

doggypaddle · 01 October 2008, 20:43

Quote:

Originally Posted by jwalker

Often, if there is impurity within the metal, a small cell is produced between the impurity and the parent metal. Corrosion is obviously greater by galvanic activity in the region of the impurity. It can inadvertently be caused by scrubbing the anode clean using a wire brush.

That would make sense, the other thing i thought was possibly oil on the anode reducing the effective active surface area?
anyway at least our anodes are dissolving not the engine which would probably be the case if they were suzuki of similar vintage!
whats the other anode look like on your engine Nos?

Nos4r2 · 01 October 2008, 21:10

Quote:

Originally Posted by doggypaddle

That would make sense, the other thing i thought was possibly oil on the anode reducing the effective active surface area?
anyway at least our anodes are dissolving not the engine which would probably be the case if they were suzuki of similar vintage!
whats the other anode look like on your engine Nos?

Normal mate, slightly furry.

doggypaddle · 01 October 2008, 21:25

Quote:

Originally Posted by Nos4r2

Normal mate, slightly furry.

Mines not bad either, certainly not wormholed like the main one.

nikster · 01 October 2008, 22:48

nos - is the rib engine left in the water on a mooring in a marina / swinging or do you keep it out? how long has the anode been immersed in the location to which the anode is eaten?

Nos4r2 · 01 October 2008, 22:50

it's trailered. Longest it's been in this year has been 2 weeks, anode kept submerged.

nikster · 01 October 2008, 22:55

is the anode an orignal OEM part or is it a patent part?

captnjack · 01 October 2008, 22:57

Defects in the zinc. Although I'm guessing you stored it in the water for awhile? That's not typical wear for a boat on a trailer.

Nos4r2 · 01 October 2008, 23:13

OEM I think. There's no evidence of the engine being stored in the water for a while at all.

nikster · 01 October 2008, 23:39

it looks fairly typical and not something i would be at all concerned about - some anodes get eaten fairly quickly and exactly the way your phots show

jyasaki · 02 October 2008, 07:01

Off topic, but I'd suspect some moose hunter...

Normal wear for an anode is less focused, and more, well, spongelike.

I'd hit up the marina where you had the boat in the water and ask them to check for currents in the water from other boats nearby.

jky

Nos4r2 · 02 October 2008, 08:37

Quote:

Originally Posted by jyasaki

Off topic, but I'd suspect some moose hunter...

Normal wear for an anode is less focused, and more, well, spongelike.

I'd hit up the marina where you had the boat in the water and ask them to check for currents in the water from other boats nearby.

jky

It's never been in a marina and there's no shore power to the pontoons it's been tied up to...

Confusing isn't it!

tsnando · 02 October 2008, 08:43

Hello
How much stainless do you have on your boat? Especially submerged or toching the water?
How often do you change you anodes?
Stainless steel is often a cause for extreme wear on anodes and galvanic corrosion around the motor.

Cumps

Nos4r2 · 02 October 2008, 08:52

Hardly any. There's a stainless disc covering the flooding hull hole,but the damage was there before I put that on and it's not accelerated it.

PeterM · 02 October 2008, 13:51

Has it been chipped by stones when its being towed ??????? OK not really a sensible suggestion , but the first one that came to me ! It COULD be , but probably not......

Not sure how this would affect an anode.