Expansion Tank, Radiator Cap - Rotax 912 iSc Maintenance Manual

10.4) Expansion tank, radiator cap

See
General note
To equalize pressure in the cooling system, an expansion tank is
required. If the pressure in the system rises above 1.2 bar (120 kPa) as
the coolant warms up, the pressure relief valve (1) opens and the coolant
can flow into the expansion tank via the line (5). When the coolant cools
down, the return valve (2) opens and the coolant is sucked back.
Inspect the rubber seal (3), the pressure spring (4) and the two valves
Radiator cap
incorporated in the radiator cap for damage and leaks. If necessary,
replace with a new original radiator cap with 1.2 bar (120 kPa) (6) open-
ing pressure.
NOTE:
Inspect sealing surface (7) and tube connection (8) of the expansion
Expansion tank
tank. Carry out visual inspection of tank for damage and scuffing marks.
Checking Expansion tank, radiator cap.
Graphic
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Fig. 15.
The radiator cap must be tightened fully on the expansion tank.
Part
1 Pressure relief valve
2 Return valve
3 Rubber seal
4 Pressure spring
5 Connection to overflow bottle
6 Opening pressure of the radiator cap
Function
12-20-00
January 01/2012
page 29