Expansion Tank, Radiator Cap - Rotax 912 Series Maintenance Manual

9.4)

Expansion tank, radiator cap

General note See
To equalize pressure in the cooling system, an expansion tank is
required. If the pressure in the system rises above 1.2 bar (17.4 psi) 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.
NOTES:
Radiator cap Inspect the rubber seal (3), the pressure spring (4) and the two valves
incorporated in the radiator cap for damage and leaks. If necessary,
replace with a new original radiator cap with 1.2 bar (17.4 psi) (6) open-
ing pressure.
NOTES:
Expansion tank
Inspect sealing surface (7) and tube connection (8) of the expansion tank.
Carry out visual inspection of tank for damage and scuffing marks.
Graphic
Checking Expansion tank, radiator cap.
Effectivity: 912 Series
Edition 3 / Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Fig. 13.
On older engines a radiator cap with opening pressure of
0.9 bar (13.0 psi) can be installed. See SI-912-020 "Run-
ning Modification", latest issue.
The radiator cap must be tightened fully on the expansion
tank.
6
8
Part
1 Pressure relief valve
2 Return valve
3 Rubber seal
4
7
3
1
3
2
Function
5
12-20-00
page 27
September 01/2012