Pipistrel Sinus 503, Flight And Maintenance Manual

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Rotax 912 cooling system
The Rotax 912 engine’s (Sinus ultralight motordlider Model 582) cylinders are watercooled. The cool-
ing-air intake is located on the right-hand bottom part of the engine cover.
Cylinder heads are watercooled. Own water pump forces water through the radiator, placed behind
the air intake opening on the top engine cover. The engine does not feature a thermostat valve. The
system is pressurised with a pressurised valve placed on one of the hoses. The overflow tank fluid
level must always be inside the designated limits!
The engine does not offer cooling water temp. monitoring. Only CHT is displayed in the cockpit. The
engine does not feature a cooling fan, therefore cooling it is entirely dependant on moving air cur-
rents and airspeed.
CAUTION!
You are strongly discouraged from leaving the engine running at idle power when
on ground.
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.
Schematic of engine cooling system - model 912
Aircraft and systems on board