Section 04 ENGINE
Subsection 08 (LIQUID COOLING SYSTEM)
04-08-3
INSPECTION
Check general condition of hoses and clamp tight-
ness.
DRAINING THE SYSTEM
To drain the cooling system, siphon the coolant
mixture from the coolant tank. Use a primer pump
with a plastic hose inserted as deep as possible
into the lower hose.
TYPICAL
When the coolant level is low enough, lift the rear
of vehicle to drain the radiators.
DISASSEMBLY AND ASSEMBLY
3,4, Sender and Plug
Apply thread sealant on sender and plug to avoid
leaks.
1, Pressure Cap
Check if the cap pressurizes the system. If not,
install a new 90 kPa (13 PSI) cap, (do not exceed
this pressure).
6,7, Radiator and Radiator Protector
Insert radiator protector into radiator C-rail and
crimp C-rail at both ends. Refer to FRAME 09-02
for radiator removal.
5, Thermostat
To check thermostat, put in water and heat water.
Thermostat should open when water tempera-
ture reaches the following degree.
On 494, 583 and 670 engines
, the thermostat is
a double action type.
a. Its function is to give faster warm up of the en-
gine by controlling a circuit; water pump —
engine — coolant tank. This is done by bypass-
ing the radiator circuit.
CLOSED THERMOSTAT, COLD ENGINE
1. To reservoir
2. From cylinders
b. When the liquid is warmed enough, the thermo-
stat opens the circuit, water pump — engine —
radiators — coolant tank to keep the liquid at
the desired temperature. (See the diagram of
the exploded view).
◆
WARNING
Never drain or refill the cooling system
when engine is hot.
A18C0EA
ENGINE TEMPERATURE
494, 583 and 670 42°C (108°F)
A16C02A
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