Cooling systems
The basic cooling system is illustrated below. Seawater is drawn into the system by
the engine impeller, entering the yacht through a skin fitting. It passes through a
seacock and a filter before passing through the engine and the mixer box and out
through the exhaust system. Its passage through the engine depends on the type of
cooling system.
Raw
water
cooled
engines______________________________
In this type of engine the raw seawater circulates through galleries in the engine
and gearbox before being injected into the exhaust pipe for discharge.
Heat
exchanger
cooled
engines____________________________
This type of system uses fresh water which circulates through the engine and a heat
exchanger in a closed circuit. Raw seawater passes through the heat exchanger
where the heat is transferred from the closed circuit freshwater system. The heated
seawater is then injected into the exhaust system for discharge. This type of engine
runs at a slightly higher temperature than the raw water type.
Water in
Water out
'Swan
neck'
Water and
exhaust out
Water inlet valve
and strainer
Stainless steel
mixer box
Stainless steel
skin fitting
Basic Engine Cooling and Exhaust System
Page 4.4
Issue 3
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