MJM Yachts 40z Express User Manual
Page 38
8.1
8.2
RAW WATER SYSTEM
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.
ENGINE RAW WATER
The engine intakes are through the drives 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, 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.)
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CHAPTER 8