COOLING SYSTEM - CONT - TM-5-3820-256-24-5

COOLING SYSTEM - CONT - TM-5-3820-256-24-5_457

COOLING SYSTEM - CONT - TM-5-3820-256-24-5_459

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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COOLING SYSTEM position of the cap, it should be possible to depress the cap approximately 3mm (1/8"). The depression can be adjusted by bending the prongs on the cap. Care should be taken when bending the prongs to ensure the cap is not too loose, as this would prevent proper sealing. Then slowly continue to turn cap counterclockwise until you can remove it. NOTE - When removing the cap, loosen it slowly and then pause to allow the pressure to bleed. This will avoid possible burning by hot water or steam. Figure 2. - Radiator Cap (Pressure Type) Continuous Deaeration Cooling System The continuous deaeration cooling system used on some IH chassis, (Figure 3) is designed to keep the cooling system free of trapped air, vent the cooling system during the filling operation and completely vent the system in about five to ten minutes. The deaeration system also aids in rapid warm-up of cold engines. Why are we concerned about the air in the cooling system? It has been found that air trapped in the cooling system will hasten corrosion in the system. Air expands more than water when heated and increases the expansion loss through the overflow pipe. More important is the possible loss of the water pump prime due to excessive amount of air, resulting in complete stoppage of coolant flow. It has been found that when coolant flow stops even for a short period, the engine is put in immediate danger. When engine is operating at full throttle, the piston rings can scuff, score or seize in as quickly as 30 seconds after the coolant flow stops. Even if coolant is present, boiling, at the points of maximum heat transfer, will occur. The transfer of heat will be reduced, and the temperature will rise high enough to destroy the lubricant oil film in the cylinder. The piston will also expand as its temperature is raised, and scoring can occur. Figure 3. - Continuous Deaeration System This damage may not be immediately noticed, and the engine will continue to operate. But this overheating can shorten the service life of the engine, resulting in high oil consumption, excessive blowby, or piston scoring especially on engines which have accumulated high mileage (200, 000 to 400, 000 miles). A properly designed deaerated cooling system must have the ability to deaerate when the engine is cold, when the thermostat is closed, as well as when the engine reaches operating temperature. To accomplish this, the radiator top tank is designed with two sections divided by a baffle (Figure 4). The core of the radiator is vented through a tube which extends above the coolant level in the upper portion of the tank. This tube provides the vent needed for the core (Figure 2). A make-up line is provided from the upper portion of the tank to the suction side of the water pump, to supply coolant to the cooling system. Another vent line is connected from the engine side of the thermostat housing to the top tank above the coolant level. This line provides a vent for the engine. CTS-4181 Page 5

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