Chrysler Air-Raid Siren Maintenance Manual

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COOLING SYSTEM

To avoid formation of lime, scales and rust, soft water should be used. As an added protection to the cooling system, it is good practice to use a rust resistor or inhibitor, which is extremely essential in areas where the water has a high alkaline or other mineral content.

Sediment or dirt accumulating in the cooling system will cause a coating to form in the radiator core and cylinder block and will cause engine overheating.

CAUTION: WHEN DRAINING THE COOLING SYSTEM IN COLD WEATHER, BE SURE TO DRAIN THE CYLINDER BLOCK. OPEN THE DRAIN COCK ON THE LEFT SIDE OF THE ENGINE AT THE LOWER EDGE OF THE WATER JACKET.

ANTI-FREEZE

Alcohol or Prestone may b2 used for protection against freezing. Solutions containing salt, calcium, soda, sugar or mineral oils should never be used in the cooling system. The capacity of the cooling system is 24 USS quarts.

The following specifications give recommendations as to the amount of alcohol or Prestone to be added to make up one USS gallon of anti-freeze solution to protect the cooling system at the temperatures indicated.

  +10 F. 0 F. -10 F. -20 F. -30 F.
Alcohol 2-1/2 Pts. 3 Pts. 3-1/2 Pts. 4 Pts. 5 Pts.
Water 5-1/2 Pts. 5 Pts. 4-1/2 Pts. 4 Pts. 3 Pts.
           
Prestone 2 Pts. 2-1/2 Pts. 3 Pts. 3-1/2 Pts. 4 Pts.
Water 6 Pts. 5-1/2 Pts. 5 Pts. 4-1/2 Pts. 4 Pts.

Before adding anti-freeze to the cooling system, the cylinder head bolts should be checked, making sure that they are tightened evenly and all connections thoroughly inspected. 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.

THERMOSTAT

The flow of water from the cylinder head to the radiator is restricted when the engine is cold by a by-pass thermostat in the water outlet elbow. The water flows directly to the water pump and back into the engine. Uniform and rapid warming up of the engine is accomplished. When the temperature reaches about 155 Fahrenheit, the thermostat allows the water to flow to the radiator in the normal manner.

When installing the thermostat be sure to install the upper and lower gasket as shown (2 and 6) Fig. 4. The thermostat has four by-pass- ports (3) 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 front to rear of the engine. This will place two ports to radiator and the other two ports toward the rear, leaving the two wide faces to right and left. There are no repairs or adjustments to be made on the thermostat and failure to operate should be corrected by replacement of the unit.


IMPORTANT:

DO NOT OPERATE ENGINE WITH THE THERMOSTAT REMOVED AS THE FUNCTION OF THIS UNIT IS ESSENTIAL TO MAINTAIN CORRECT OPERATING TEMPERATURES AND TO INSURE MAXIMUM PERFORMANCE.

WATER PUMP

The water pump is of the centrifugal type, mounted on the front of the cylinder block and carrying the fan on the outer end of the shaft. It is driven by "V" belt that drives the fan and generator.

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