CHAPTER 8
RAW WATER SYSTEM
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8.1 GENERAL
Raw water (seawater) is used to cool the engine and the generator. It is also used in the
washdown and air-conditioning options. Wherever raw water enters the boat, it does so through a
seacock, which is a valved thru-hull penetration with double-clamped hoses.
8.2
ENGINE RAW WATER
The engine intakes are alongside the engines through 3-way seacocks as seen in the chapter on
propulsion. The generator (if fitted) use separate seacocks and strainers. Before using the engine
or the generator, make sure its seacock is in the INTAKE position. While you are checking this
system, visually inspect the strainer to insure that it is not fouled.
Using an engine with restricted
raw water flow can cause over-heating and damage to the engine.
When you start an engine, it is
advisable to check the exhaust as it exits the boat to make sure water is being mixed into the
exhaust gas. You should see a surge of water every few seconds. (It make take more than a few
seconds for the first surge.)
