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| Illustration 1 | g01795173 |
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Cooling system diagram | |
Coolant is pulled from radiator (1) to water pump (6). From the water pump, coolant is sent through engine oil cooler (7). Part of the coolant flows to air compressor (4) and to turbochargers (5), while most of the coolant is routed through engine block (3).
The coolant flows into the water jacket of the block at the front of the engine and the coolant is directed to both sides of the engine block through distribution manifolds. The distribution manifolds are connected to the water jacket for all the cylinders.
The coolant flows upward through the water jacket of the engine block. The coolant flows around the cylinder liners from the bottom to the top. Near the top of the cylinder liners, the water jacket is tapered and the cooling jacket becomes smaller. This area has the hottest temperature. This smaller area causes the coolant flow to increase for better cooling of the cylinder liner. Coolant from the top of the liners flows into the cylinder head which sends the coolant around the components of the cylinder head. Coolant flows to the top of each cylinder head. The coolant flows out of the cylinder head to the cylinder block. The coolant flows through the front housing to water temperature regulator (2) that is electronically controlled.
The water temperature regulator is controlled by the temperature control module. The temperature control module receives a temperature setpoint from the engine Electronic Control Module (ECM). As the water temperature regulator is opened, coolant is sent through the bypass line back to the inlet of the water pump. As the temperature of the coolant increases, the regulator is opened. When the regulators open, the coolant flow in the bypass line is restricted. Coolant is sent through the outlets to the radiator.