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Rawwater system
The rawwater system is the engine's external cooling system. The rawwater pump draws in water via the
rawwater intake and pump it on through the charge air cooler, oil cooler and the heat exchanger. The system is
protected against galvanic corrosion by zinc anodes located in the charge air cooler, oil cooler and in the heat
exchanger.
The rawwater system must be drained during cold weather when there is a risk of freezing to prevent the system
from bursting. An alternative to draining is to keep the engine room free from frost using an approved heater fan.
WARNING! The rawwater system must be closed and drained before commencing work on the system.
This due to the risk of rawwater or water from the central cooling system entering the vessel.
Maintenance: Rawwater system
Draining the rawwater system
WARNING! Risk of water entering. Close the
rawwater cock before starting work on the
rawwater system.
1. Close the rawwater cock.
2. Remove the cover on the rawwater pump and al-
low the water to run out.
3. Drain from one drain cock at a time and allow the
water to run out until all the drain cocks on the en-
gine are open.
IMPORTANT! Make sure the coolant really
runs out. It may be necessary to clean away
deposits inside the drain cocks.
4. Drain/empty also any accessories such as
rawwater filter, flush/bilge pump, etc.
5. Fit the cover on the rawwater pump and connect
all hoses, closing/fitting drain cocks and plugs be-
fore leaving the boat.
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