Coolant - Vetus M4.55 Operation Manual

9 Operating media
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:
Cooling system protective
liquid (Anti-freeze)
max. 45 vol%
40 vol%
min. 35 vol%
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 Protection against
freezing to
55% -35°C (-31°F)
60% -28°C (-18°F)
65% -22°C (-8°F)
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
pH-value at 20°C (68°F)
Chloride ion content [mg/dm
Sulfate ion content [mg/dm
Total hardness [degrees]
Never use sea-water or brackish water.
Cooling system protective liquids must be disposed
of in accordance with environmental regulations.

Coolant

min. max.
6.5 8.5
3
] – 100
3
] – 100
3 12
C
aution
W
arning
87