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Maintenance: Freshwater system
Cooling system, external cooling
Introduction
A cooling system with external cooling does not have a heat exchanger but is cooled by heat being transferred
via one or two external cooling circuits. A single circuit system serves all the components being cooled. A dual
circuit system has either two freshwater circuits or one freshwater circuit together with one seawater circuit. In
both cases, one of the circuits cools the engine and the other circuit cools the charge air cooler and the oil cool-
ers.
Coolant level. Check
WARNING! Never open the filler cap when the
engine is warm. Steam or hot fluid may spurt
out.
Make sure the level ends up between the MIN and
MAX marks. If there are no marks, the coolant level
should be approx. 5 cm (2") below the sealing surface
of the filling cap (1). Fill if necessary with the same
type of coolant that is already in the system.
IMPORTANT! Check the coolant level on a cold
stationary engine.
1
Two circuits
Two circuits
One circuit
One or two
circuits
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