DETROIT DIESEL 53
5
SECTION 5
COOLING SYSTEM
CONTENTS
Cooling System ................................ ................................ ................................ ...........................
Water Pump ................................ ................................ ................................ ................................ .
Water Pump Idler Pulley Assembly ................................ ................................ ............................
Thermostat ................................ ................................ ................................ ................................ ..
Engine Cooling Fan ................................ ................................ ................................ ....................
Specifications - Service Tools ................................ ................................ ................................ ....
COOLI NG
below operating temperature, the coolant is restricted at
A
the thermostat housing(s) and a by-pass provides water
centrifugal type water pump is used to circulate the
circulation within the engine during the warm. up period.
engine coolants. Each system incorporates thermostats
to maintain a normal operating temperature of 160 185
F. Typical V-type engine cooling system is shown in
Fig . 1.
Radiator and Fan Cooling System
The engine coolant is drawn from the lower portion of
the radiator by the water pump and is forced through the
oil cooler and into the cylinder block.
From the cylinder block, the coolant passes up through
the cylinder head(s) and, when the engine is at normal
operating temperature, through the thermostat
housing(s) and into the upper portion of the radiator.
Then the coolant passes down a series of tubes where
the coolant temperature is lowered by the air stream
created by the revolving fan.
Upon starting a cold engine or when the coolant is
1972 General Motors Corp.
August, 1972
SEC. 5 Page 1
