Rotax 915 i A series Maintenance Manual page 325

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 bottle.
COOLANT
The coolant is pumped by a camshaft-driven water
pump, from the radiator to the individual 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 915 i A Series Installation
Manual. For more detailed information on
operation, maintenance, safety or flight,
consult the documentation 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 Chapter 74-00-00 section Ignition
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 and flows via a hose at atmospheric pres-
sure into the transparent overflow bottle. When the
coolant cools down, it is sucked back into the cooling
circuit.
OVERFLOW BOTTLE
See the current 915 i A Series Installation
Manual. For more detailed information on
operation, maintenance, safety or flight,
consult the documentation provided by the
aircraft manufacturer and dealer.
Effectivity: 915 i A Series
Edition 0/Rev. 0
BRP-Rotax
MAINTENANCE MANUAL HEAVY
unit.
SAFETY INFORMATION
m WARNING
Danger of severe burns and scalds! Always al-
low the engine to cool down to ambient tem-
perature 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 position!
ENVIRONMENTAL NOTE
Please observe the disposal regulations appli-
cable in your area.
ENVIRONMENTAL NOTE
Observe the safety instructions of the manu-
facturer of hazardous substances (coolant, oil)
or fuels and the applicable regional waste dis-
posal regulations.
ENVIRONMENTAL NOTE
Work with the utmost care to ensure that no
water pollutants can penetrate into the soil,
water or the sewerage system.
75–00–00
Page 7
August 01 2018