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127
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
coolant should not fall below/exceed the following limits:
Cooling system protective
liquid (Anti-freeze)
Water
Protection against
freezing to
max. 45 vol%
-35°C (-31°F)
55%
40 vol%
-28°C (-18°F)
60%
min. 35 vol%
-22°C (-8°F)
65%
The protective liquid concentration must be maintained under all
circumstances. Therefore if coolant must be added always use the
same mixture of anti-freeze
and tap water.
Water quality for coolant preparation
Use preferably tap water.
If 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
Sulphate 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 dis-
posed of in accordance with environmental regu-
lations.
11 Operating media
Coolant
Summary of Contents for DT4.70
Page 1: ...Operation manual DT4 70 DTA4 85 ...
Page 2: ...ii ...
Page 141: ...139 ...
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