ENCODER 3520481 - Caterpillar

Illustration 1 g00290888
Cooling system for a warm engine (1) Cylinder head. (2) Water temperature regulator. (3) Outlet hose. (4) Vent line. (5) Vent tube. (6) Shunt line. (7) Elbow. (8) Water pump. (9) Cylinder block. (10) Oil cooler. (11) Inlet hose. (12) Radiator.In operation, the water pump (8) circulates the coolant from the radiator (12) to the oil cooler (10) .The coolant from the oil cooler (10) goes into the cylinder block (9) through a bonnet and an elbow. The coolant goes around the cylinder liners, through the water directors and into the cylinder head.The water directors send the flow of coolant around the area of the valves and the area of the exhaust ports in the cylinder head. The coolant then goes to the front of the cylinder head. At this point, water temperature regulator (2) controls the coolant flow into the top of the radiator.The water temperature regulator (2) is closed when the engine is cold. The coolant flows through the regulator housing and elbow (7) back to water pump (8) .If the coolant is at normal operating temperature, the water temperature regulator (2) opens and the coolant flows to the radiator (12) through the outlet hose (3). The coolant temperature lowers as the coolant moves through the radiator. When the coolant gets to the bottom of the radiator, the coolant goes through the inlet hose (11) and into the water pump (8) .Note: The water temperature regulator (2) is an important part of the cooling system. The water temperature regulator (2) divides the coolant flow between the radiator (12) and the bypass elbow (7). If the water temperature regulator is not installed in the system, there is no mechanical control. If a higher volume of coolant goes through the radiator, the engine will not reach normal operating temperatures. This can occur during cold weather.Shunt line (6) gives several advantages to the cooling system. The shunt line gives a positive coolant pressure at the water pump inlet that prevents pump cavitation. A small flow of coolant constantly goes through shunt line (6) to the inlet of water pump (8). This causes a small amount of coolant to move constantly through the vent tube (5). The flow through the vent tube is small and the volume of the upper compartment is large. Air in the coolant is removed as the coolant goes into the upper compartment.The vent line is used to release the pressure in the cooling system as the cooling system heats up to operating temperature. This will purge any air out of the system.The OEM may supply a surge tank. The tank can be mounted on the radiator or mounted on a remote location. The coolant that expands past the radiator cap is retained in the surge tank. The coolant contracts as the temperature drops and the coolant is drawn back into the radiator.Coolant For Air Compressor
Illustration 2 g00290889
Coolant flow in air compressor (1) Air compressor. (2) Outlet hose. (3) Inlet hose.The coolant for the air compressor