d02880.fm
MAINTENANCE MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2 / Rev. 0
12-20-00
page 27
October 01/2009
9.4) Expansion tank, radiator cap
General note See Fig. 12.
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: 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.
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: The radiator cap must be tightened fully on the expansion
tank.
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.
Part Function
1 Pressure relief valve
2 Return valve
3 Rubber seal
4
5
6
7
1
3
2
8
3
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