Cooling System: Description and Operation

Cooling System Components And Flow:

COOLING SYSTEM COMPONENTS AND FLOW
The illustration above identifies the significant features of the coolant system.

1. Coolant is drawn from the radiator by the integrally mounted water pump. The output from the water pump empties into the oil cooler cavity of the cylinder block.
2. The coolant then circulates around each cylinder and crosses the block to the fuel pump side of the engine.
3. Coolant then flows up into the cylinder head, crosses over the valve bridges and down the exhaust manifold side of the engine to the integral thermostat housing.
4. As the coolant flows across the head toward the thermostat housing, it provides cooling for the injector nozzle. When the engine is below operating temperature, the thermostat is closed, and the coolant flow bypasses the radiator and goes to the water pump inlet via internal drillings in the block and cylinder head.

When operating temperature is reached, the thermostat opens, blocking the bypass passage to the water pump and opening the outlet to the radiator.

^ Never operate the engine without a thermostat. Without a thermostat, the coolant will not flow to the radiator and the engine will overheat.