General Information; Cooling System, Liquid - Toro 520XI Service Manual

2.0415.008
2.7163.09
2.7163.013
5xi Series Tractor Service Manual
GASOLINE ENGINE
Inspect air intake screens often. Keep cooling
and combustion air paths free of debris at all
times.
Consult the engine manufacturer's service
manual for specific instructions and service
intervals.
NOTE: Operating the engine with a blocked air
intake screen, dirty or plugged cooling fins,
and/or cooling shrouds removed, will cause
engine damage due to overheating.
It is preferable to blow dirt out, rather than
washing it out. If water is used, keep it away
from electrical items.

COOLING SYSTEM, LIQUID

General Information

Models 520Lxi are equipped with a
liquid-cooled engine.
This engine uses a gear driven water pump to
circulate coolant through passages in the
engine block and cylinder heads. The coolant
carries engine heat to a radiator which transfers
the heat stored in the coolant to the
surrounding air by drawing the cooler ambient
air through fins in the radiator with a belt driven
fan.
Engine temperature is maintained by a
thermostat which opens at approximately 150°
F (66° C). When the thermostat is open, it
allows coolant to flow through the radiator.
When the coolant temperature falls below 150°
F (66° C) the thermostat closes, bypassing the
radiator allowing faster warm-up and consistent
operating temperature.
The cooling system is pressurized at operating
temperature to prevent evaporation and raise
the boiling point of the coolant .
Maintenance
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