Rotax 912 i Series Maintenance Manual page 293

SYSTEM DESCRIPTION
The engine is cooled by liquid-cooled cylinder
heads and ram-air-cooled cylinders. The cooling
system of the cylinder heads is a closed cooling
circuit with an expansion tank and overflow bot-
tle.
COOLANT
The coolant is pumped by a water pump, driven
by the camshaft, from the radiator to the indivi-
dual cylinder heads. The coolant flows out of the
top of the cylinder heads and is collected in the
expansion tank. Since the standard location of
the radiator is below engine level, the expansion
tank located on top of the engine allows for
coolant expansion.
RADIATOR
See the current 912 i Series Installation Manual.
For more detailed information on operation,
maintenance, safety or flight, consult the docu-
mentation provided by the aircraft manufacturer
and dealer.
WATER PUMP
The water pump is integrated in the ignition
housing. The ignition housing must be removed
for repair work on the water pump.
See also section 74-00-00 Ignition unit.
EXPANSION TANK
The expansion tank is closed by a pressure cap
(with pressure relief valve and return valve).
When the coolant heats up and expands, it
opens the pressure relief valve can flow via a
thin hose at atmospheric pressure into the trans-
parent overflow bottle. When the coolant cools
down, it is sucked back into the cooling circuit.
OVERFLOW BOTTLE
See the current 912 i Series Installation Manual.
For more detailed information on operation,
maintenance, safety or flight, consult the docu-
mentation provided by the aircraft manufacturer
and dealer.
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
SAFETY INFORMATION
WARNUNG WARNING
Danger of severe burns and scalds!
Always allow the engine to cool down to ambient
temperature before starting any work.
The radiator cap on the expansion tank must
only be opened when the engine has cooled
down!
Ensure that the engine is in the horizontal posi-
tion!
CONNECTIONS FOR DISPLAY SYSTEMS
WARNUNG
Follow the instructions in the installation manual
regarding connections for instrumentation.
TEMPERATURE SENSOR
Coolant flows around the temperature sensor,
which measures the coolant temperature
directly.
The temperature sensor is situated in cylinder
head 4.
MAINTENANCE
As well as the maintenance and special checks,
see the relevant Maintenance Manual Line for
the respective 912 i Series engine type.
Before the cooling system is removed, the work
described below must be carried out to identify
any further malfunctions in the cooling system
and rectify them as part of the repair work.
WARNUNG
If these checks are omitted, it may be necessary
to dismantle the cooling system again to rectify
any malfunctions after it has been repaired.
NOTICE
NOTICE
75-00-00
Page 5
July 01/2012