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| Illustration 1 | g00321825 |
Coolant Flow (1) Radiator (2) Pressure cap (3) Inlet line to radiator (4) Water temperature regulator (5) Cylinder head (6) Cylinder block (7) Inlet line to water pump (8) Water pump (9) Internal bypass line (shunt line) (10) Engine oil filter (11) Engine oil cooler (12) Elbow (13) Cylinder liner | |
Water pump (8) is on the left front side of the engine. Water pump (8) is gear-driven by the timing gears. Coolant from the bottom of radiator (1) flows to the water pump inlet. The rotation of the impeller in water pump (8) pushes the coolant through the system.
All the coolant from water pump (8) travels through engine oil cooler (11). Elbow (12) on the outlet side of engine oil cooler (11) connects to the side of cylinder block (6).
On engines with a torque converter oil cooler, a bonnet is mounted on engine oil cooler (11). This bonnet diverts the coolant through the second cooler, before the bonnet allows the coolant to enter cylinder block (6) .
The coolant enters the cylinder block. Then, the coolant flows around cylinder liners (13), through the coolant directors, and into cylinder head (5).
The coolant directors force the coolant flow around the valves and around the exhaust ports (passages) in the cylinder head. The coolant now flows to the front of the cylinder head. At the front of the cylinder head, water temperature regulator (4) controls the direction of the coolant flow.
If the coolant temperature is lower than the regular setting, the water temperature regulator (4) is closed. The coolant must pass through internal bypass (9) to the water pump. When the coolant reaches the regular temperature settings, water temperature regulator (4) opens. Most of the coolant flows through radiator inlet line (3) to the radiator, although some coolant still passes through internal bypass (9) .
Coolant for Air Compressor
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| Illustration 2 | g00322143 |
Coolant Flow In Air Compressor (14) Outlet hose. (15) Air compressor. (16) Inlet hose. | |
The coolant for air compressor (15) comes from the cylinder block through hose (16) and into the air compressor. The coolant flows from the air compressor through outlet hose (14) back into the front of the cylinder head.
Cooling System Components
Water Pump
The centrifugal type of water pump has two seals:
- One prevents leakage of water.
- One prevents leakage of lubricant.
An opening in the bottom of the pump housing allows any leakage to escape. A small amount of leakage may occur during normal engine operation.
The fan is driven by two V-belts from a pulley on the crankshaft and by the fan drive. Belt tension is adjusted by moving the alternator.