| |
| Illustration 1 | g06138855 |
Coolant is pulled from radiator (1) to water pump (6). From the water pump, coolant is sent through engine oil cooler (7). From the engine oil cooler, part of the coolant is sent to air compressor (4) and to turbochargers (5). Most the coolant is sent through engine block (3).
Coolant flows into the water jacket of the block at the front of the engine. 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 jackets 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 is the area that 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. Coolant flows back down into the block and returns into the front housing.
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. Coolant flow in the bypass line is restricted, when the regulators open. Coolant is sent through the outlets to the radiator.
| |
| Illustration 2 | g06138869 |
|
(9) Coolant supply line from low-pressure turbocharger to high-pressure turbocharger
(10) Coolant supply line from engine block to low-pressure turbocharger | |
Coolant is supplied to the low-pressure turbocharger through coolant lines (10) that are attached to the engine cylinder block. Coolant then flows to the high-pressure turbochargers from coolant lines (9) that come from the low-pressure turbochargers. The coolant returns to the top tank of the radiator through the return line.