Expansion Tank, Radiator Cap - Rotax 914 Series Maintenance Manual

3.4)

Expansion tank, radiator cap

See Fig. 20 to 22.
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.
◆ NOTE:
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) opening pressure.
Inspect sealing surface (7) and tube connection (8) of the expansion tank. Carry
out visual inspection of tank for damage and scuffing marks.
◆ NOTE:
6
7
8
Legend:
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
7 sealing surface
8 tube connections
Effectivity: 914 Series
Edition 1 / Rev. 0
BRP-Rotax
MAINTENANCE MANUAL
At older engines a radiator cap with opening pressure of 0.9 bar
(13.0 psi) can be installed see SI-25-1997 "Running Modifica-
tion", latest issue.
The radiator cap must be tightened on block.
00393
Fig. 20
00395
Fig. 21
4
3
1
3
2
5
Fig. 22
07620
12-00-00
page 22
May. 01/07