BUSHING 4T0208 - Caterpillar

Illustration 1 g03347351
(1) Jacket water pump (2) Tube (3) Engine oil cooler (4) Auxiliary oil cooler (5) Aftercooler (6) Block (7) Cylinder head (8) Water manifold (9) Water temperature regulator housing (10) Tube (11) Bypass tube (12) RadiatorCoolant flows to the jacket water pump (1) through an elbow that connects to the radiator (12). Part of the coolant is sent to the aftercooler while most of the coolant is sent through the engine oil cooler (3). After the coolant exits the oil cooler, the coolant flows into the auxiliary oil cooler (4). From the auxiliary oil cooler the coolant enters the cylinder block (6) .Note: There is one opening on the pump outlet so that a remote pump can be connected to the system. The remote pump can be used if there is a failure of the pump on the engine.The coolant that is sent to the aftercooler goes through the first stage aftercooler core. The coolant then travels through an elbow. The coolant goes into a passage in the block. The passage is near the center of the vee at the rear of the block. The coolant flows through the oil cooler into the water jacket of the block at the right rear cylinder. The cooler coolant mixes with the hotter coolant. The mixture goes to both sides of the block through 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 water jackets. 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. The smaller area has the hottest temperature. The 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 (8). Coolant then flows through the manifold to the temperature regulator housing (thermostat).Water temperature regulator housing (9) 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. The coolant flow in the bypass line is restricted when the temperature of the coolant increases enough to open the regulators. Coolant is sent through the outlets to the radiator (12).