DETROIT DIESEL
Engine Systems
COOLING SYSTEM
returns to the radiator where it passes down a series of
One of three different types of cooling systems is used
tubes and is cooled by the air stream created by the fan.
on a Series 53 engine: radiator and fan, heat exchanger
and raw water pump, or keel cooling. A centrifugal type
When starting a cold engine or when the coolant is
water pump is used to circulate the engine coolant in
below operating temperature, the coolant is restricted at
each system. Each system incorporates thermostats to
the thermostat housing(s) and a by-pass provides water
maintain a normal operating temperature of 160-185
circulation within the engine during the warm-up period.
F. Typical engine cooling systems are shown in Figs. 17
and 18.
Heat Exchanger Cooling System
Radiator Cooling System
In the heat exchanger cooling system, the coolant is
drawn by the circulating pump from the bottom of the
The engine coolant is drawn from the bottom of the
expansion tank through the engine oil cooler, then
radiator core by the water pump and is forced through
through the engine the same as in the radiator and fan
the oil cooler and into the cylinder block. The coolant
system. Upon leaving the thermostat housing, the
circulates up through the cylinder block into the cylinder
coolant either passes through the heat exchanger core
head, then to the water manifold and thermostat
housing. From the thermostat housing, the coolant
Fig. 17. Typical Cooling System for In-Line Engine
Page 25
