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Old 06-06-2017, 15:57   #1
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Location: Utah
Boat: Lagoon 400 Cat
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Seawater in Engine Compartment

Has anyone experienced seawater entry into the engine compartment via the air vents. I have water in some of the air vents obviously entering from the aft exit of the vents under the vent cover.
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Old 06-06-2017, 18:38   #2
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Re: Seawater in Engine Compartment

Not happened to us, even though we've had seas break on that part.

Are you sure water is entering through air blower vents? Have you checked that they are caulked into the hull securely?

We have had saltwater in engine compartment through the air valve on top of grey vented loop of raw water hose. If this one-way air valve gets clogged then engine raw water pump causes water to flow through valve and down black rubber breather hose into engine compartment. Only while engine is running. Easily fixed by removing and cleaning the valve on top of the loop.
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Old 10-06-2017, 14:05   #3
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Re: Seawater in Engine Compartment

Thanks for the response. Yes the vent hose is full of water. I also have had the vent leak some water in and when cleaned it does go away.

I also know I had a leak at the closure insert, it moved and had to be reset and caulked.

I also have some leakage at the engine deck cover, the weather-stripping split apart at the joint, when glued together it stopped.
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