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Engine cooling system
Rotax 912 (80 HP) cooling system
The Rotax 912 engine’s cylinders are air-cooled, the cylinder heads are liquid cooled. The cooling-air
intake is located on the right-hand bottom part of the engine cover.
Cylinder heads are liquid cooled. The water pump forces water through the radiator. The engine does
not feature a thermostat valve. The overflow tank fluid level must always be inside the designated
limits!
The engine does not feature a cooling fan, therefore cooling is entirely dependent on moving air cur-
rents and airspeed.
CAUTION! You are strongly discouraged from leaving the engine running at idle power when
on ground for extended periods of time.
The manufacturer recommends use of cooling fluids used in car industry diluted in such a manner
that it withstands temperatures as low as - 20°C/ -4°F (please refer to SI-912-016 “Selection of suit-
able operating fluids“, latest issue, for details).
Schematic of engine cooling system
Aircraft & systems
7-10
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