Jeep CJ-3A - Cooling System Components; Radiator Cap, Thermostat, Water Pump, and Fan Belt

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RADIATOR FILLER CAP.
This cap is of the pressure type, which prevents evaporation and loss of cooling solution. A pressure up to 4-1/2 pounds (.25
Kg./sq. cm.) makes the engine more efficient by permitting a slightly higher operating temperature. Vacuum in the radiator is
relieved by a valve in the cap which opens at 1/2 to 1 pound (.035 to .070 Kg./sq. cm.) vacuum.
DRAINING COOLING SYSTEM.
To completely drain the cooling system, open both drain cocks; that at the bottom of the radiator and also in the cylinder block
under the denera tor. Remove the radiator cap to break any vacuum which might prevent thorough draining.
THERMOSTAT.
A 145° F. (62.8~ C.) to 155° F. (68.30 C.) thermostat, Fig. 2, No. 8,is used to provide quick warming and to prevent overcooling
during normal vehicle operation. The temperature at which this unit operates is set by the Manufacturer and can not be altered.
Should sudden heating occur the thermostat should be checked first as failure of this unit to operate will nearly block the water
circulation. As a check, remove the thermostat and if the overheating is eliminated, install a new one.
HEAT INDICATOR.
The heat indicator is of the hydrostatic type and is connected to a bulb, mounted in the water chamber of the cylinder head, by a
capillary tube. Should this unit fail to operate, it should be replaced as it is not practical to either repair or adjust it.
WATER PUMP.
The water pump assembly Fig. 15 is a centrifugal impeller type, of large capacity to circulate the water in the entire cooling
system.
The sealed type double-row ball bearing is integral with the shaft and is packed at the time of assembly with a special high
melting point grease, so requires no lubrication.
The pump is designed to give maximum service without adjustments. Should trouble develop, consult your Willys-Overland
Dealer.
FIG. 15 —WATER PUMP ASSEMBLY
FAN BELT.
The fan and generator are driven by a “V”-type belt. The drive is on the sides of the belt, therefore it is not necessary to adjust it
tight, which might cause excessive wear on the water pump and generator bearings. Adjust the belt by swinging the generator
away from the engine until the belt can be depressed 1” (25 mm.) by thumb pressure midway between the pulleys.
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