d04924.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2/Rev. 0
75-00-00
page 16
August 01/2012
Hose connect-
ing expansion
tank
Hose from expansion tank to overflow bottle:
- The hose from the expansion tank to the overflow bottle must be rated
for vacuum/suction for min. 125 °C (257 °F), e.g. it must be strong
enough to withstand high temperatures and vacuum/suction during the
cooling down period.
The aircraft manufacturer must give the possibility to the pilots to check
the coolant level in the expansion tank. Also it is necessary to inform the
pilots about the daily inspection of the coolant level in the aircraft manufac-
turers operators (pilots) manual or an adequate link to the ROTAX
912 Series Operators Manual.
It is recommended that adequate measures are taken for carrying out
these inspections, e.g. a flap or panel on the cowling or a warning instru-
ment in the cockpit for low coolant level.
3.1) Connecting size and position of connections
General note See Fig. 7 and Fig. 8.
NOTE: See therefore also SI-912-020 “Running modifications“, la-
test issue.
Non-compliance can result in serious injuries or death!
A soft walled hose is not suitable as it can collapse and
cause cooling system failure..
The hoses must be fixed with appropriate clips to pre-
vent loss, e.g. with spring type hose clips, such as
those used for the coolant hoses between the water
pump and cylinder. Clips of this type have performed
well in the field..
Expansion tank (1) with radiator cap (2)
to radiator (3):
Slip-on length
Outside dia. 25 mm (1“)
Max. 22 mm (7/8“)
to overflow bottle (4):
Slip-on length
Outside dia. 8 mm (3/8“)
Max. 15 mm (9/16“)
water inlet elbow (5)
Slip-on length
Outside dia. 27 mm (1 1/16“)
Max. 19 mm (3/4“)
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