Engine Maintenance
81
Engine Cooling System
The engine uses a closed, circulating type,
pressurized cooling system. Correct engine
temperatures are controlled and maintained by a
radiator, fan, and thermostat. The coolant is
circulated through the system by a belt driven
centrifugal pump. The pump draws the coolant
from the radiator, circulates it through the cylinder
block and head, and returns it to the radiator. A
thermostat mounted in the water pump outlet
automatically maintains the coolant temperature
within the specified temperature range.
All water cooled engines are shipped from the
factory with a 50% permanent type antifreeze
concentrate and 50% water mixture in the engine
cooling system.
This provides the following:
• Prevents freezing down to -34 C (-30 F)
• Retards rust and mineral scale that can cause
engine overheating
• Retards corrosion (acid) that can attack
accumulator tanks, water tubes, radiators and
core plugs
• Provides lubrication for the water pump seal.
AEA626
1. Thermostat Housing 5. Condenser/Radiator Coil
2. Coolant Level Indicator 6. Accumulator
3. Radiator Cap 7. Accumulator Drain
4. Expansion Tank
Figure 34: Engine Cooling System Components
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