Effectivity: 914 Series
Edition 2 / Rev. 0
d04277
page 51
July 01/2008
BRP-Rotax
INSTALLATION MANUAL
Hose from the expansion tank to the overflow bootle:
- Hose connecting expansion tank to overflow bottle must be rated for vacuum/
suction for min. 125 °C (257 °F). E.g.: the hose 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. 19/20/21.
- 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 experience has been
made with this type of clamps.
◆ NOTE: See therefore also SI-914-022 "Running modifications", latest issue
for more information.
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 914.
It is recommended to make adequate precautions for accomplishment of these
inspections, e.g. a dooror panel on the cowling or a warning instrument in the cockpit
for low coolant level.
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