APRILIA 8140172, Service And Repair Manual

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COOLING SYSTEM
5 - 3
RSV mille
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The centrifugal pump (positioned inside the engine and
driven by the latter) draws coolant and distributes it to the
galleries in the cylinders and in the heads in order to cool
the internal parts of the engine.
The path of the coolant on leaving the engine varies de-
pending on the temperature of the actual coolant, and is
illustrated below.
The coolant volume increase (caused by the temperature
increase) is compensated for in the expansion tank. To check and top up the coolant, refer to the “LOW” and
“FULL” reference marks, see 2.15 (CHECKING AND
TOPPING UP COOLANT).
For any information regarding the coolant, see 1.2.5
(COOLANT).
Key
1) Front cylinder thermistor
2) Rear cylinder thermistor
3) Breather pipe
4) Coolant compensation pipes
5) Filler hose
6) Filler neck
7) Engine hose (right side) - thermal expansion valve
8) Rear cylinder hose - three-way manifold
9) Front cylinder hose - three-way manifold
10) Thermal switch
11) Three-way manifold
12) Three-way manifold hose - left radiator
13) Radiator link hose
14) Left radiator electrofan
15) Left radiator (vertical flow)
16) Right radiator (vertical flow)
17) Right radiator electrofan
18) Thermal expansion valve hose - pump
19) Right radiator hose - thermal expansion valve
20) Three-way thermal expansion valve
(type with heat-sensitive wax)
21) Centrifugal pump
22) Expansion tank
= Direction of flow with thermal expansion
valve open
= Direction of flow with thermal expansion
valve shut