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Maintenance: Freshwater system
5. Close air vents. Check the coolant level and top
up if needed.
IMPORTANT! Make sure that the engine is
filled with lubrication oil before starting or
cranking the engine.
IMPORTANT! The engine must not be
started before the system has been bled and
topped up.
6. Start the engine and run it under light load until the
thermostat valve opening temperature is reached.
7. Check air vents for leaks.
8. Stop the engine and allow it to cool. Check the
coolant level in the expansion tank and top up if
needed.
Draining the coolant
1. Remove the filler cap on the expansion tank.
2. Open the air vent cocks and then drain the coo-
lant from the drain cocks.
IMPORTANT! Check that the coolant really
drains. Deposits may need to be removed from
inside the drain plugs/taps.
3. Drain all systems connected to the freshwater
system, e.g. heater, water heater, etc.
4. Close all drainage points.
Flushing the freshwater system
The system should be flushed before changing coo-
lant to avoid inferior cooling performance due to depo-
sits in the cooling system.
1. Drain the coolant as described earlier.
2. Insert a hose into the filler opening and flush with
fresh water.
3. Flush until the water running out of the drainage
points is clean.
4. Close all drainage points when the flushing water
has run out.
5. Fill with coolant. See section coolant filling when
empty.
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