109
Coolant fluid
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.
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
C
aution
Never use sea-water or brackish water.
W
arning
Cooling system protective liquids must be disposed of
in accordance with environmental regulations.
