68
6 Maintenance
Coolant replacement
Every 1000 operating hours.
52 Filling the cooling system
• Remove the cap of the ller neck on the top
of the heat exchanger housing.
• Remove the bolt from the upper side of the
thermostat cover, so that air can escape
from the cooling system.
• Fill the cooling system.
Use a mixture of 40% antifreeze (ethylene-
glycol based) and 60% tap water or use a spe-
cial coolant.
For specications see page 109.
If a water heater is connected to the en-
gine and this heater is positioned above
the upper side of the engine than bleeding
of the heater will not take place automati-
cally! Fill the heater separately to bleed the
cooling system completely.
For a keel-cooled version, see page 19.
If a water heater is connected, see page 20
and 21
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