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| Illustration 1 | g06204670 |
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G3516 TA | |
Water temperature regulators are used in each circuit to maintain correct operating temperatures.
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| Illustration 2 | g06266790 |
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(1) Tube for the coolant supply to the back right side of the cylinder block
(2) Tube for the coolant supply to the aftercooler (first stage) (3) Tube to the back of the cylinder block (4) Aftercooler (first stage) (5) Bypass tube (6) Water temperature regulator housing (7) Outlet for coolant to radiator or heat exchanger (8) Lower water temperature regulator housing (9) Tube to the front of the cylinder block (10) Inlet for the jacket water pump (11) Jacket water pump | |
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| Illustration 3 | g06267053 |
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(8) Lower water temperature regulator housing
(12) Tube from the cylinder head (13) Water cooled exhaust manifold | |
The jacket water pump is on the right front side of the engine. The water pump has a gear that is driven by the lower right front gear group. Coolant from the radiator or the heat exchanger enters the water pump inlet. The rotation of the impeller in the jacket water pump pushes the coolant through the system.
The flow of the coolant is divided. Some of the coolant from the jacket water pump flows through a tube to the front of the cylinder block and into the main distribution manifold for the water jacket of each cylinder. The remainder of the coolant is split two ways.
Some of the coolant flows into the water jacket of the right rear cylinder. This coolant is mixed throughout the water jackets with the coolant that flows to the front of the cylinder block. The remainder of the coolant flows through the first stage of the aftercooler and eventually into the back of the cylinder block.
The coolant inside the cylinder block flows around the cylinder liners. The water jacket is smaller near the top of the cylinder liners. This shelf causes the coolant to flow faster for better cooling of the cylinder liner. The coolant is pumped up through water directors into the cylinder heads. The coolant flows through passages around these items in the cylinder head: valves, valve seat inserts, spark plug adapter and exhaust outlets.
The coolant exits the cylinder heads through tubes and the coolant flows into the water cooled exhaust manifold.
Coolant flows through the water cooled exhaust manifold into a line for the turbocharger turbine housing. The coolant returns to the water manifold.
Air is vented from the high points of the cooling system. The vent line from the connection must be straight and the vent line must have a slight upward slope. Ensure that the vent is not obstructed.
The water cooled exhaust manifold directs the coolant to the water temperature regulator housing. The engine has eight water temperature regulators. The water temperature regulators control the direction of the coolant flow according to the coolant temperature.
When the coolant achieves normal operating temperature, the water temperature regulators open and coolant flow is divided. Most of the coolant goes through the radiator or through the heat exchanger. This coolant circulates back to the jacket water pump. The remainder of the coolant goes through a bypass tube to the jacket water pump.
Note: The water temperature regulators are necessary to maintain the correct engine temperature. If the water temperature regulators are not installed in the system, there is no mechanical control. Most of the coolant will take the path of least resistance through the bypass tube. This action will cause the engine to overheat in hot weather. The small amount of coolant that goes through the radiator in cold weather will not allow the engine to achieve normal operating temperatures. The water temperature regulators control the minimum temperature of the coolant. The radiator or the heat exchanger controls the maximum temperature of the coolant.
The bypass tube has another function. When you fill the cooling system, the internal bypass allows the coolant to go into the cylinder head and into the cylinder block without going through the water pump.
The total system capacity depends on the amount of coolant in the cylinder block, in the piping, and in the radiator or heat exchanger.
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| Illustration 4 | g06266692 |
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(1) Tube for the coolant return from the oil cooler to the thermostatic valve
(2) Oil cooler (3) Tube for the coolant supply to the oil cooler (4) Aftercooler (second stage) (5) Tube for the coolant supply to the aftercooler second stage (6) Outlet for coolant to radiator or heat exchanger (7) Inlet for coolant from the radiator or heat exchanger (8) Thermostatic valve housing (9) Auxiliary water pump | |
Auxiliary water pump is driven by the engine auxiliary drive. The coolant is pumped through a tube to the aftercooler second stage . The coolant exits the aftercooler through a tube that feeds the oil cooler. Coolant exits the oil cooler into a tube that is connected to a thermostatic valve housing.
When the coolant is cool, the thermostatic valves are closed. The coolant is routed directly back to the auxiliary water pump. The coolant is recirculated through the aftercooler.
When the coolant reaches the opening temperature, the thermostatic valves open. The coolant flows to a radiator or to a heat exchanger through the outlet . The coolant returns to the auxiliary pump through the inlet .