Section 05: COOLING SYSTEM
PA1562
7
FIGURE 9: CHARGE AIR COOLER HOSE CLAMPS (DDC
S60)
05134
FIGURE 10: CHARGE AIR COOLER HOSE CLAMPS
(VOLVO D13)
NOTE
Detroit Diesel Series 60 and Volvo D13
engines have similar CAC piping designs and
they use the same constant-torque hose
clamps. Tighten hose clamps as specified
above.
3.2.1 Maintenance
Since the constant-torque clamp automatically
adjusts to keep a consistent sealing pressure,
there is no need to retorque hose clamps on a
regular basis. During vehicle operation and
shutdown, the screw tip will adjust according to
the temperature and pressure changes.
Checking for proper torque should be done
at room temperature.
4. THERMOSTAT OPERATION
4.1 DETROIT DIESEL SERIES 60 ENGINE
Coolant temperature is controlled by two
blocking-type thermostats located in a housing
attached to the cylinder head, on the turbo side
of the engine (Fig. 11).
At coolant temperature below approximately
182°F-188°F (83°C-86°C), the thermostat valves
remain closed and block the flow of coolant from
the engine to the radiator. During this period, all
of the coolant in the system is recirculated
through the engine and directed back to the
suction side of the water pump via a bypass
tube. As the coolant temperature rises above
182°F -188°F (83°C-86°C) the thermostat valves
start to open, restricting the bypass system, and
allowing a portion of the coolant to recirculate
through the radiator. When the coolant
temperature reaches approximately 202°F
(95°C) thermostat valves are fully open, the
bypass system is blocked off and the coolant is
directed through the radiator.
FIGURE 11: THERMOSTAT HOUSING (DDC S60 ENGINE)
05117
4.2 VOLVO D13 ENGINE
1. Drain the cooling system.
2. Remove the bolts, the thermostat housing
and the thermostat. Carefully clean the
thermostat seat and all cylinder head-to-
thermostat housing mating surfaces.
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