MAINTENANCE MANUAL
AQUILA AT01
A
12-14-00 Page 301
COOLING SYSTEM - SERVICING
1.
A. The cooling system of the ROTAX 912 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
expansion tank. For a more detailed description and related maintenance procedures of the
cooling system, refer to 75-20-00.
B. Coolant
There are two different cooling systems possible on the AQUILA AT01 each requiring a different
coolant. The standard cooling system of the AQUILA AT01 (combined water / oil radiator) must
only be operated with waterless coolant based on propylene glycol. If SB-AT01-029 has been
carried out (installation of the AT01-100 cooling system with separate water and oil radiators) only
conventional coolant based on ethylene glycol with 50% water content must be used.
(1) Waterless coolant based on propylene glycol such as EVANS Aero Cool 180
This type of coolant must be used on the standard AQUILA AT01 cooling system
with a combined water / oil radiator.
WATER OR COOLANT CONTAINING WATER MUST NEVER BE ADDED TO
THE COOLING SYSTEM! THE MAX. WATER CONTENT MUST NOT EXCEED
3,6%; IT CAN BE TESTED USING A BRIX REFRACTOMETER. ANY WATER
PRESENT IN THE COOLING SYSTEM IS SEPARATED OUT AS VAPOR. THIS
CAN CAUSE THE COOLING SYSTEM TO FAIL DUE TO INSUFFICIENT
COOLANT QUANTITY.
USE COOLANT IN ACCORDANCE WITH MANUFACTURER S
INSTRUCTIONS.
General
CAUTION:
WARNING:
NOTE:
NOTE:
NEVER OPEN PRESSURE CAP OR RADIATOR CAP WHEN THE COOLING SYSTEM
IS HOT. FOR SAFETY REASONS, COVER CAP WITH A CLOTH AND OPEN
SLOWLY. SUDDEN OPENING OF THE CAP COULD PROVOKE THE EXIT OF
BOILING COOLANT AND RESULT IN SEVERE SCALDING.
Refer to the ROTAX Service Instruction SI-912-016, latest revision, for further information on
suitable coolants. The maximum coolant quantity is 2,5 liters (2.6 U.S. quarts).
'
If EVANS Aero Cool 180 is not available locally for servicing the cooling system, a
conventional coolant based on pure 100% ethylene glycol can be used
temporarily. However, the coolant must be replaced again with EVANS Aero
Cool 180 within the next 15 days. Only add 100% pure ethylene glycol!
(2) Conventional coolant based on ethylene glycol such as BASF Glysantin Protect Plus / G48
50% antifreeze concentrate with additives against corrosion and 50 % pure water, or use of an
equivalent premixed coolant. The coolant must be renewed every two years.
Servicing
T
emporary Revision 4, 27.04.15