Technical data

67
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 cool-
ing 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:
The protective liquid concentration must be maintained under all
circumstances. Therefor 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 an other available fresh water is used; the values given below
must not be exceeded.
Never use sea-water or brackish water.
Cooling system protective liquids must be disposed of in accord-
ance with environmental regulations.
9 Operating media
Coolant
Cooling system protective Water Protection against
liquid (Anti-freeze) 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)
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