Thermo King KD-II SR, Manual

Page: 81 / 182

Engine Maintenance (Rev. 04/03)
67
ENGINE COOLING SYSTEM
The engine employs 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
side of the radiator (large header), circulates it through the
cylinder block and head, then back to the radiator. A
thermostat mounted in the water outlet from the cylinder
head to the radiator automatically maintains coolant
temperature within the specified temperature range.
Engine Cooling Components
1. Accumulator 4. Thermostat Housing
2. Engine 5. Fuel Heater Option
3. High H
2
O Temperature Switch 6. Expansion Tank
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:
1. Prevents freezing down to -30 F (-34 C).
2. Retards rust and mineral scale that can cause engine
overheating.
3. Retards corrosion (acid) that can attack accumulator
tanks, water tubes, radiators and core plugs.
4. Provides lubrication for the water pump seal.