BEARING-MAIN 0.75MM US 7C6963 - Caterpillar

Jacket Water Aftercooling
Illustration 1 g00919741
(1) Jacket water pump (2) Coolant tube (3) Engine oil cooler (4) Aftercooler (5) Cylinder block (6) Cylinder head (7) Water manifold (8) Water cooled turbocharger (9) Water temperature regulator housing (10) Coolant tube (11) Coolant bypass tube (12) Heat exchangerCoolant flows to jacket water pump (1) through an elbow that connects heat exchanger (12). Part of the coolant is sent to the aftercooler while most of the coolant is sent through engine oil cooler (3) .The coolant that is sent to the aftercooler goes through the aftercooler core. The coolant then goes through an elbow. The coolant goes into a passage in the cylinder block. The passage is near the center of the vee at the rear of the cylinder block. The coolant that is sent to the engine oil cooler goes through the engine oil cooler. The coolant flows into the water jacket of the cylinder block at the right rear cylinder. The cooler coolant is mixed with the hotter coolant. The mixture goes to both sides of the cylinder 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. This is the area that has the hottest temperature. This 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 water manifold (7). Coolant then flows through the manifold to the water temperature regulator housing (9) (thermostat).Water temperature regulator housing (9) has an upper flow section and a lower flow section. The water temperature regulator housing uses four water temperature regulators. The sensing bulbs of the four water temperature regulators are in the coolant in the lower section of the housing. Before the water temperature regulators open, cold coolant is sent through the bypass line back to the inlet of the water pump. As the temperature of the coolant increases, the water temperature regulators start to open. When the water temperature regulators open the coolant flow in the bypass line is then restricted. Coolant is sent through the outlets to heat exchanger (12) .Separate Circuit Aftercooling
Illustration 2 g00919685
Separate circuit schematic (1) Cylinder block (2) Water cooled turbocharger (if equipped) (3) Oil cooler (4) Regulator housing (5) Jacket water pump (6) Source for jacket water coolant (7) Aftercooler (8) Thermostatic valve (9) Separate circuit water pump (10) Separate circuit coolant sourceCoolant goes in water pump (5) through an elbow that connects to the source for the jacket water coolant (6). The