INSTALLATION MANUAL
AIRCRAFT ENGINES
page 11 - 2
Initial issue, May 01/99
Effectivity: 447 UL SCDI, 503 UL DCDI, 582 UL DCDI /mod. 99
d00321
11.3.3) Anti-freeze additives
◆ NOTE: Anti-freeze additives reduce the cooling effect. This
should be taken into consideration at choice and instal-
lation of the radiator.
11.3.4) Cooling system
To avoid coolant pump cavitation, the cooling system must be under
pressure. This is achieved by using a pressure cap with a release pressure
of approx. 0,9 bar (13 psi).
The coolant hoses must be installed in such a way that air and steam
bubbles can escape from any point of the system towards the expansion
chamber.
The overflow hose (10) coming from the radiator neck is to be led into a
vented overflow bottle (11) . It should be half filled with coolant. The
overflow hose must reach into the coolant or enter at the bottom of the
overflow container.
The overflow bottle should be fitted not lower than 250 mm (10 inch) below
the radiator cap. When the system cools down, the originally displaced
liquid is sucked back through the breather valve in the radiator cap.
◆ NOTE: If the coolant is not sucked back, the cooling system
is faulty and must be checked.
◆ NOTE: If at 582 UL DCDI model 99 a straight water outlet socket
is used, vent the cooling system well, check after a short
operating period at a temperature higher than 65°C (150°F),
and refill coolant as required.
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