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Corrosion on Mercruiser 350 Magnum

jdrake80

New member
Hello,

I apologize if this is a stupid question. I'm not a mechanic and have spent very little time around engines and boats. I admit I'm an idiot, so please save any eye-rolling.

I have a 1994 20' Bluewater with a Mercruiser 350 Magnum Alpha One engine and just noticed some corrosion on the engine between casing. Does anyone know what this might be from? And what should be done about it? It appears on the compartments on both sides of the engine (though am not sure what compartments these are).

See attached pics.

Any insight would be great. Thank you!

IMG_9361.jpg
 
only if there cast iron, some were SS and it could be the manifold surface going bad. Drain the manifold and riser, remove the riser and inspect everything
 
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