d05785.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 i Series
Edition 1/Rev. 0
75-00-00
Page 3
January 01/2012
1) Cooling system
1.1) System description
Cooling See Fig. 2.
The engine cooling system is designed for liquid cooling of the cylinder
heads and ram air cooling of the cylinders.
The cooling system of the cylinder heads is a closed circuit with an expan-
sion tank and overflow bottle.
Coolant The coolant flow is forced by a water pump, driven from the camshaft,
from the radiator to the individual cylinder heads. The coolant flows from
the top of the cylinder heads to the expansion tank (1). Since the standard
location of the radiator (3) is below engine level, the expansion tank
located on top of the engine allows for coolant expansion.
Expansion tank The expansion tank is closed with a pressure cap (2) (with pressure relief
valve and return valve). As the coolant heats up and expands, the pres-
sure relief valve opens and the coolant flows via a thin hose at atmo-
spheric pressure to the transparent overflow bottle (4). As it cools down,
the coolant is sucked back into the cooling circuit.
Shape, size and
position
The shape, size and position of the radiator(s) depends mainly on the
space available in the aircraft.
Measuring the
coolant temp.
NOTE: The coolant temperature sensor is in cylinder head 4.
Radiator If a GENUINE-ROTAX radiator is being used, then an oil-water heat
exchanger must not be present. The radiator is dimensioned to cater for
the heat of the coolant and cannot cope with the additional heat generated
by the oil system.
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