Cagiva Navigator, Workshop Manual, Page: 380 / 407

H.5
ENGINE COOLING
ENGINE COOLANT
The cooling circuit is filled with a 50/50 mixture of distilled water and
ethyl-glycol antifreeze in the factory. This 50/50 mixture supplies an
optimum protection against corrosion and the temperature. It also
protects the system against freezing to –31°C.
If the machine is exposed to temperatures less than –31°C., the
ratio of the mixture must be increased to 55% or 60% as indicated in
the figure.
* If the radiator cap is removed whilst the engine is hot, the boiling liquid or vapour can cause serious
burns. After allowing the engine to cool for a while, wrap the radiator cap in a thick cloth and remove
the cap by unscrewing a quarter of a turn to unload the pressure. Afterwards, unscrew completely.
* The engine must be cold when maintenance is carried out on the cooling system.
* The engine coolant is dangerous:
• If it comes into contact with the skin or the eyes. Repeatedly rinse with abundant water.
• If it is swallowed, provocate vomiting and immediately call a doctor.
• Keep the engine coolant out of reach of children.
Antifreeze Freezing
%age point
50% -31°C
55% -40°C
60% -55°C
Fig. 1 Freezing point - engine coolant
density curve
Fig. 2 Boiling point - engine coolant
density curve.
Freezing point
Boiling point
(°C)
Density (%)
Density
Pressure
Engine coolant liquid 50% reserve included.
Antifreeze 1 000 ml
Distilled water 1 000 ml
• Utilise a good quality ethyl-glycol mixed with distilled wa-
ter. Do not mix with alcohol-based antifreeze or antifreeze
of different makes.
• Do not use more than 60% or less than 50% of antifreeze
in the mixture (see the figure on the right).
• Do not use additives to cure radiator leaks.