Exhaust Fumes

[Mattyb]

Hi guys

I am getting a massive amount of exhaust fumes in the cabin (s&s34 with 17hp Volvo ) this is my first yacht so not too sure where it can be coming from apart from the obvious holes that I can't see. I am guessing I need a new seal where it joins the engine but thought I had better ask if there was anywhere else I should check ? Not really competent with diesels yet !

[atoll]

most common would be the metal tube were the salt water is mixed in off the back of the engine,next would be the lift box a bit furthur,though exhaust hose can fail as well