From what you've described it's clear the water is not being pumped through. In order to assist it would be helpful if you could say what engine it is.
There are two types of cooling system used on marine engines: direct (or 'raw'), which draws water from the river/sea and circulates it through the engine and out through the exhaust, and indirect which uses a pressurised closed circuit and a heat exchanger. The raw water then cools the heat exchanger and goes out of the exhaust system. Indirect systems use two pumps, one for the recirculation and one for the raw water.
In either case the lack of water from the exhaust suggests the raw water pump is not working. If you trace the pipework up from the intake cock you can locate this pump. This will have a rubber impeller inside which may have broken up or might have been removed altogether as part of a laying-up process. This is the most likely cause of the problem. I probably don't need to say that it's not advisable to run the engine for more than a minute or so without coolant or you might blow the head gasket.
>Its great to see there is a members club for these
>boats. Im trying to help my friend and his dad get his
>seamaster 27 running well again.
>The engine hadnt been started for over 2 years, it
>started nicely but it seems to be running far too hot
>and cant see any water coming out the back of the boat
>as it should.
>Have stipped all the coolent pipes down to look for
>blockages I have removed the thermostat, still nothing.
>Could it be the water pump gone? How do i get the
>water to run out the back? Just getting exhaust gases
>Does anyone have any suggestions on what i could try?
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