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Cooling System Malfunctions - Diagnosis
Page 7-6
Cooling System
DODGE Turbo Diesel
©
The pump is belt driven from the crankshaft pulley. An
automatic belt tensioner Is used to prevent the belt from
slipping on the pump pulley. A malfunction of the tensioner will
cause the water pump impeller to rotate at a slower speed
reducing the amount of coolant flow.
^
] 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 83°C I181°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.
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Table of Contents
Troubleshooting
