Effectivity: 915 i A Series
Edition 0 / Rev. 0
BRP-Rotax
Page 7-5
December 01 2017
7.2) Cooling system
System Overview
The cooling system of the engine is designed for liquid cooling
of the cylinder heads and ram-air cooling of the cylinders. The
cooling system of the cylinder heads is a closed circuit with an
expansion tank.
Coolant flow
The coolant flow is forced by a water pump, driven from the
camshaft, from the radiator to the cylinder heads. From the top
of the cylinder heads the coolant passes on to the expansion
tank. Since the standard location of the radiator is below engine
level, the expansion tank located on the top of the engine allows
for coolant expansion.
Expansion tank
From the expansion tank the coolant is sucked back to the
water pump. In common installations the coolant passes a radi-
ator in between. Additionally the expansion tank is closed by a
pressure cap (with excess pressure valve and return valve). At
temperature rise of the coolant the excess pressure valve
opens and the coolant will escape via hose at atmospheric
pressure. In common installation this hose is connected to an
overflow bottle. This overflow bottle allows that, when the en-
gine is cooling down, the coolant will be sucked back into the
cooling circuit.
Coolant tempera-
ture measuring
The coolant temperature sensor is located on cylinder head 4.
Figure 4: Cooling system (symbolic)
1
Expansion tank
2
Radiator
3
Pressure cap
4
Overflow bottle
5
Level glass
Summary of Contents for 898851
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