Effectivity: 912 Series
Edition 1 / Rev. 1
d04635
page 55
May 01/2009
BRP-Powertrain
INSTALLATION MANUAL
Expansion tank to overflow bottle hose:
-
Hose connecting expansion tank to overflow bottle must be rated for
vacuum/suction for min. 125 °C (257 °F). E.g. it must be strong enough
to withstand high heat and suction during the cooling down period.
▲
WARNING: A soft walled hose is not suitable as it can collapse and cause
coolant system failure.
12.7) Size and position of connections
See Fig. 26/27/28.
-
expansion tank (1) with radiator cap (2)
to radiator (3):
outside dia. 25 mm (1")
slip-on length
max. 22 mm (7/8")
to overflow bottle (4):
outside dia. 8 mm (3/8")
slip-on length
max. 15 mm (9/16")
■
CAUTION:
The hoses have to be fixed with appropriate clamps to prevent
loss. E.g. with spring type clamps as used already for the water
tubes between water pump and cylinder. Good field experi-
ence has been made with this type of clamps.
◆
NOTE:
See therefore also SI-912-020 "Running modifications", latest
issue.
The aircraft manufacturer has to carry out the check of coolant level in the
expansion tank and note it in the daily inspection section of his flight manual
according latest issue of Operators Manual ROTAX 912.
It is recommended to make adequate precautions for accomplishment of these
inspections, e.g. a flap or panel on the cowling or a warning instrument in the
cockpit for low coolant level.
