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You are correct , this is just a cowl vent. Since the bottom is covered by the liner , I doubt that provide much ventilation unless it was connected to the blower hose of the engine bay . No need here either since it is a doesel and not a gas atomic 4 . I might just close it with a plate.Looks like a simple cowl vent. You can put a bag over it against rain, or remove the cowl and close the opening with the screw plate.
If it's actually a Dorade box, yeah, there will be a drain system to check out.
his is a great solution . How about water coming through the vent itself ? Do you have a dorade box underneath it ?There might be drips around the base plate fastenings, indicating a need to re-bed the base. I have not have that happen but did have some repeated drips around the plastic where the vent was friction fitted into the base, when it rained hard. I "solved" that by putting some softer silicone sealant around the base and rotating it a bit while pushing it into place. This sealed it OK, and it could still be removed by rotating it and then pulling it out.
No dorade on either of the factory engine air in or out , on our boat.T
his is a great solution . How about water coming through the vent itself ? Do you have a dorade box underneath it ?
2 reasons: Keep water from getting everything in the locker wet. Also, to keep water from running along the underside of the cockpit combing into the cabin and destroying wood work and upholstery.What is the purpose of a hose from a vent to the bilge?
Is there a blower?
Removing the vent and putting a cap over it will accomplish the same thing (keeping water out) assuming you've addressed the leaky trim ring.2 reasons: Keep water from getting everything in the locker wet. Also, to keep water from running along the underside of the cockpit combing into the cabin and destroying wood work and upholstery.
Without a blower, I agree.But what does it vent, without a blower? The long hose kills any passive circulation.
FWIW, I removed mine.Very good discussion! I am of the opinion that the vent accomplished very little since blowers are a necessity for gas powered inboard engines but not diesel. It seems like a redundancy that is very unecessary and does not improve the overall air circulation. I will just cap the vents and make sure the plates don't leak.
Thanks for all the opinions, pictures and suggestions.
I'm no HVAC engineer, but I suspect the long hoses do not kill passive ventilation.But what does it vent, without a blower? The long hose kills any passive circulation.