Checking The Thermostat - APRILIA M192M Workshop Manual

Engines M192M / M191M / M245M / M234M / M282M / M281M
3.4.4.

CHECKING THE THERMOSTAT

•
Visually inspect thermostat (1) for damage.
•
Fill a metal container with about 1 liter of water.
•
Immerge the thermostat (1). Keep it at the center of
container.
•
Immerge multimeter thermal probe close to the ther-
mostat.
•
Heat container with a thermal gun.
•
Check thermostat opening start temperature:
Engines M245M / M281M (125 cc H
perature: 69.5 ÷ 72.5°C
Engines M234M / M282M (200 cc)= Opening start tempera-
ture: 77.5 ÷ 80.5°C
Continue heating until thermostat is fully open:
Engines M245M / M281M (125 cc H
3.5 mm a 80°C
Engines M234M / M282M (200 cc) = Opening stroke: 3.5
mm a 88°C
WARNING
For a correct test procedure, avoid direct con-
tact between thermostat and container.
•
In case of faulty operation, change thermostat (1).
O)= Opening start tem-
2
O) = Opening stroke:
2
ENGINE
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