A Series Diesel Engine Coolant System 53
Coolant System
Coolant System Component and
Flow
The following illustration identifies the significant
features of the coolant system.
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.
The Coolant then circulates around each cylinder and
crosses the block to the fuel pump side fot the engine.
Coolant then flows up into the cylinder head, crosses
over the bridges and down the exhaust manifold side
of the engine to the integral thermostat housing.
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 open, blocking the bypass passage to the
water pump and opening the outlet to the radiator.
Caution: Never operate the engine without a
thermostat. Without a thermostat, the
coolant will not flow to the radiator and the
engine will overheat.
1. Radiator. 2. Thermostat. 3. Water Temperature Gauge. 4.
Water Pump. 5. Water Manifold. 6. Cylinder Head
7. Piston. 8. Cylinder Block. 9. Oil Cooler (Optional).
A. From Oil Pump (Oil)
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