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Old 01 January 2011, 15:23   #11
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thanks for the advice
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Old 01 January 2011, 15:31   #12
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Originally Posted by spartacus View Post
Out of interest, what engine is this? Unusual to see as much suface corrosion there. I'd put money on the sacrifical zinc anodes not being replaced as a possible cause.
Anodes only work under water!
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Old 01 January 2011, 17:06   #13
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Quote:
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Anodes only work under water!
True, but if the anodes are shot it won't matter. The anodes protect the whole engine not just the underwater parts.
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Old 03 January 2011, 12:15   #14
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Anodes only work under water!
Sort-of-true. They'll work as long as they're in contact with the water.

Don't know about the F40 (if that's what''s in question), but the F115 has a could of anodes in the powerhead that are in contact with the circulated cooling water in the water jacket.

They will, however, only protect metal bits that are electrically connected to them, hence the little black grounding wires between the various engine and drive pieces.


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Old 03 January 2011, 15:22   #15
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Its a Honda is it not ? Its a solid part, but rub it down yourself treat it with some Hammerite Kurust or similar, then paint it with topcoat.
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Old 03 January 2011, 19:26   #16
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The anodes protect the whole engine not just the underwater parts.
No.

An anode will only protect a part it is electrically bonded to and only if it and the part are both immersed in water.

Anyway, the steering arm is a solid casting and just needs some paint. It's not easy to get to to paint though!
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Old 04 January 2011, 04:21   #17
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My old Yam 55 died from 2 things:

1) the anodes had all but dissappeared
2) the earth strap between leg & head had snapped, hence the cyl block turned to shortbread. Leg etc was id reasonable nick, just a bummer about the top half!

The tiller arm is a pain to get in to reapint. one option is use emery paper strip for sanding machines & somewhere I've seen small wire brushes, then spray it.
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