The belt driven, centrifugal Water Pump circulates water from the Radiator to the Cylinder Block, completely around each Cylinder bore, through the Cylinder heads, around the Exhaust Valve Ports into special passages in the Intake Manifold and thence to the Thermostat housing for recirculation or return to the Radiator.

The by-pass Thermostat restricts flow of the water to the Radiator, allowing the water to recirculate through the Engine, thereby a uniform and rapid warm-up of the Engine is accomplished, when the water temperature reaches approximately one hundred fifty-five (155) degrees F., the Thermostat starts to open, and allows the water to flow to the Radiator in the normal manner.

A by-pass passage and tubes from the Intake Manifold provide circulation of the water through the Carburetor Throttle Body to prevent Icing at the Throttle Valve when the Engine is started and the atmosphere is cool and humid.

The Radiator is equipped with a pressure vent type Filler Cap which allows the Cooling System to pressurize up to approximately seven (7) pounds, at which time, the Valve and Seat in the Cap, raise and allow any pressure in excess of seven (7) pounds to escape through the overflow tube. This method increases the boiling point and decreases the evaporation of the Engine Coolant.

Three (3) drain cocks are provided for draining the Cooling System, one in the Radiator and one at each side of the Cylinder Block below the exhaust manifold, all three must be open to drain the System completely.

COOLANT

To avoid formation of lime, scale and rust, soft water should be used. As an added protection to the Cooling System, it is good practice to use MOPAR Rust Resistor, which is extremely essential in areas where the water has a high alkaline or mineral content. Sediment, rust or dirt accumulating in the Cooling System will cause a coating to form in the Radiator core and Cylinder Block and will cause overheating of the Engine. Follow manufacturers recommendations printed on can, when adding MOPAR Rust Resistor to Cooling System.

When adding water to Cooling System do not fill above one inch below lower end of filler neck. When Engine comes up to normal operating temperature, the expansion of the liquid in the Cooling System will force the liquid in excess of above amount out the overflow pipe, thereby weakening the Rust Resistor or Anti-Freeze solution.

ANTI-FREEZE

Before adding MOPAR type Anti-Freeze to the Cooling System, the Cylinder Head bolts should be checked. Starting at the center, tighten all Cylinder Head bolts with a Torque Wrench eighty (80) to eighty-five (85) foot pounds as shown in (Figure 11). Inspect all other connections

thoroughly and tighten if necessary. This Inspection should be made again after the Engine has been run at Idle for approximately ten minutes, as leaks do not generally occur until the Engine is at normal operating temperature. The capacity of the Cooling System is fifteen (15) gallons.

The following specifications give recommendations as to the amount of MOPAR Permanent Type Anti-Freeze to be added to water to make up one (1) USS gallon of Anti-Freeze solution to protect the Cooling System at the temperatures indicated.

The correct Hydrometer for the solution should be employed in testing.

THERMOSTAT

There are no repairs or adjustments to be made on the Thermostat and failure to operate should be corrected by replacement of the unit. When installing a new Thermostat be sure to install the upper and lower gaskets. The Thermostat has four (4) by-pass ports and it is essential that these ports be in the proper position. The alignment of the thin bridge that divides the ports should be from the front to rear of the Engine. This will place two (2) ports toward the Radiator and the other two (2) ports toward the rear of the Engine, leaving the two (2) wide faces to the right and left. Do not operate Engine with the thermostat removed as the function of this unit is essential to maintain correct operating temperatures in All Seasons to insure maximum performance.