DETROIT DIESEL
COOLING SYSTEM
One of three different types of cooling systems is used
coolant returns to the radiator where it passes down a
on a Series 53 engine: radiator and fan, heat
series of tubes and is cooled by the air stream created
exchanger and raw water pump, or keel cooling. A
by the fan.
centrifugal type water pump is used to circulate the
engine coolant in each system. Each system incorpo-
When starting a cold engine or when the coolant is
rates thermostats to maintain a normal operating
below operating temperature, the coolant is restricted
temperature of 160- 185 F (71-85 C). Typical engine
at the thermostat housing(s) and a by-pass provides
cooling systems are shown in Figs. 18 and 19.
water circulation within the engine during the warm-
up period.
Radiator Cooling System
Heat Exchanger Cooling System
The engine coolant is drawn from the bottom of the
In the heat exchanger cooling system, the coolant is
radiator core by the water pump and is forced through
drawn by the circulating pump from the bottom of the
the oil cooler and into the cylinder block. The coolant
expansion tank through the engine oil cooler, then
circulates up through the cylinder block into the
through the engine the same as in the radiator and fan
cylinder head, then to the water manifold and
system. Upon leaving the thermostat housing, the
thermostat housing. From the thermostat housing, the
coolant either passes through the heat exchanger core
Fig. 18 - Typical Cooling System for In-Line Engines
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