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Old 04 November 2014, 16:16   #1
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What's this?!!

Got myself a merc 4hp to refurb and use as an auxillary. Spotted this beneath the cav plate and have no idea what it's for!! Click image for larger version

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Old 04 November 2014, 16:19   #2
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RIBase
Looks like an anode?
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Old 04 November 2014, 16:21   #3
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What's this?!!

Its called a Sacrificial Anode ,
over time it will corrode away & need replacing hence "Sacrificial " it helps stop galvanic corrosion of the engine parts especially the aluminium .
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Old 04 November 2014, 16:32   #4
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Blimey!!! How does that work then?!
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Old 04 November 2014, 16:54   #5
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It corrodes and your engine doesn't
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Old 04 November 2014, 16:58   #6
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That's pretty clever! Looks like it should have had one for much longer :oS
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Old 04 November 2014, 17:35   #7
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Quote:
Originally Posted by rigi36 View Post
It corrodes and your engine doesn't
Not if it is made of zinc

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Originally Posted by jwatson View Post
Looks like it should have had one for much longer
I wonder why
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Old 05 November 2014, 03:49   #8
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it is an anode and will require replacing in the future, so once it has only about a third left, then is the time to replace it. team tip before fitting a new one make sure that there is a good earth connection, and using a marine grease put a little on the bolt/screw so that when it needs replacing in the future it will take just a couple of minites. NEVER wire brush it to clean it, NEVER paint or put anything on it. If you ignore the nevers the OBM will probaly corrod but the anode will look nice.
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Old 05 November 2014, 08:20   #9
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Oooh didn't know about the wire brush bit, why is that ? Are you not exposing more of the metal by doing that?
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Old 05 November 2014, 09:01   #10
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you dont wire brush it because, it will corrode quicker as it will now be dis-similar metal, just dont go down that road, as its fraught with problems.
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