FRAME AS 3352351 - Caterpillar

Illustration 1 g00309803
Flow diagram for the cooling system (1) Cylinder block (2) Water cooled turbocharger (if equipped) (3) Engine oil cooler (4) Regulator housing (5) Jacket water pump (6) Radiator (7) Aftercooler (8) Thermostatic valve (9) Auxiliary water pump (10) RadiatorCoolant flows to the jacket water pump (5) through an elbow that connects to radiator (6). The coolant exchanges heat with the air that flows through the radiator. The coolant flow is sent through the engine oil cooler (3) .The coolant flows through the engine oil cooler (3). The coolant then flows into the water jacket of the cylinder block (1) at the right rear cylinder. The coolant flows to both sides of the block through the distribution manifolds. The distribution manifolds are connected to the water jacket of all the cylinders. The main distribution manifold is located just above the main bearing oil gallery.The coolant flows upward through the cylinder water jacket. The coolant flows around the cylinder liners from the bottom to the top. Near the top of the cylinder liners, the water jacket is made smaller. This is the area that has the hottest temperature. This shelf (smaller area) causes the coolant to flow faster for better liner cooling. Coolant from the top of the liners flows into the cylinder head which sends the coolant around the parts that have the hottest temperature. Coolant flows to the top of the cylinder head (one at each cylinder). The coolant flows out of the cylinder head through an elbow into a water manifold. Coolant then flows through the manifold to the temperature regulator housing (thermostat) (4) .Regulator housing (4) has an upper flow section and a lower flow section. The regulator housing uses four temperature regulators. The sensing bulbs of the four temperature regulators are in the coolant in the lower section of the housing. Before the regulators open, cold coolant is sent through the bypass line back to the inlet of the water pump (5). As the temperature of the coolant increases, the regulators start to open. The regulators restrict the flow of coolant in the bypass line. Some of the coolant is sent through the outlets to radiator (6) .Separate Circuit (If Equipped)For engines with a separate circuit cooling system, the coolant is isolated from the jacket water system. Although the jacket water and the separate circuit use the same radiator, the coolant lines are isolated for each system.Coolant flows to auxiliary water pump (9) through an elbow that connects to radiator (10). The coolant flows through aftercooler (7). The coolant absorbs heat from the turbochargers' compressed intake air.Coolant flows through aftercooler (7) and back to thermostatic valve (8). Before the thermostatic valve (8) opens, cold coolant is sent back to auxiliary water pump (9). As the temperature of the coolant increases the thermostatic valve starts to open. The valve then restricts the coolant flow in the bypass line. Some of the coolant is sent through the outlet to radiator (10) .Coolant for the water cooled