129
Coolant uid
The preparation and monitoring of coolant in inter-cooled engines is
especially important because corrosion, cavitation and freezing can
lead to engine damage. Use as coolant a mixture of a cooling system
protective liquid (anti-freeze, ethylene glycol based) and tap water.
Or use a, ethylene glycol based premix coolant i.e., ‘ready-to-use’ cool-
ant. For example Vetus VOC Organic coolant.
In tropical climates, where anti-freeze availability may be limited, use a
corrosion inhibitor to protect the engine cooling system.
The concentration of the cooling system protective liquid in the cool-
ant should not fall below/exceed the following limits:
Cooling system protective
liquid (Anti-freeze)
Water Protection against
freezing to
max. 45 vol% 55% -35°C (-31°F)
40 vol% 60% -28°C (-18°F)
min. 35 vol% 65% -22°C (-8°F)
The protective liquid concentration must be maintained under all cir-
cumstances. Therefor if coolant must be added always use the same
mixture of anti-freeze and tap water.
11 Operating media
Coolant
Water quality for coolant preparation
Use preferably tap water.
If an other available fresh water is used; the values given below must
not be exceeded.
Water quality min. max.
pH-value at 20°C (68°F) 6.5 8.5
Chloride ion content [mg/dm
3
] – 100
Sulfate ion content [mg/dm
3
] – 100
Total hardness [degrees] 3 12
Caution
Never use sea-water or brackish water.
Warning
Cooling system protective liquids must be disposed of
in accordance with environmental regulations.
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