A Series Diesel Engine Coolant System 58
The coolant flow can also be reduced if the inlet hose
to the water pump collapses. A hose will usually not
collapse while the engine is running at low speed.
Check the hose while the engine is running at rated
speed.
Note : Be sure the engine is warm, a minimum of
85°C[185°F], so the thermostat is open.
A worn or malfunctioning water pump will not produce
the flow required to prevent the engine from running
hot. However, be sure to check the other possibilities
indicated in the Troubleshooting Logic before
checking the flow or replacing the pump.
As stated in the coolant discussion, an obstruction in
the passages can interrupt flow.
Radiator, Fans and Shutters
Air forced through the fins of the radiator by a fan
cools the coolant pumped through the radiator.
Environmental debris (paper, straw, lint, dust, etc.)
can obstruct the fins and stop the flow of air which will
reduce the cooling effect of the radiator.
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