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Are you running with your engine room blowers on? Many builders do not design enough ventilation for air gulping diesels, and having a exhaust blower pulling air from the engine room makes it worse. At idle speed it is good to have exhaust blowers on, but not at cruise for many boats.
Check around the edges of floor hatches and where the bulkheads meet the floor. If you see dirt stains, the engines are pulling air in from places other than the vents.
One remedy is to add a blower to bring air into the engine room. However some Carvers already have intake blowers, check yours and make sure which way the blow, in or out, and that they are functioning properly.
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