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I have a 1997 SeaRay 330 sundancer and the exhaust will be at a regular noise level while i'm crusing and all of a sudden it will get louder. any ideas???

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Exhaust noise will change if the engine tune changes but in that case there would usually be a change in performance at the same time.

If there is no change in performance, the most likely cause of a fluctuating increased noise would be a change in the exhaust - it could be one of the boxes breaking up inside, assuming boats have some sort of silencer box. Boats are unusual territory for me.

Not only are boats unusual territory but power boats are quite alien - I know it is usual practice with cruisers to exit the exhaust at or below the water level and to use the exhaust as an exit for the engine cooling water. It would seem a sensible conclusion in that case to assume a change in exhaust note/volume would be a symptom of an engine cooling problem/blockage.

Posted on Apr 24, 2017

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