Coolant

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 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% 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 circumstances. Therefore if coolant must be added always use the same mixture of anti-freeze and tap water.

Coolant

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/dm3] – 100 Sulphate ion content [mg/dm3] – 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.