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Cooling System
i05288851
Cooling System - Check
Engine And Cooling System Heat
Problems
1. The following conditions indicate that a heat
problem exists.
a. Hot coolant is released through the pressure
cap during the normal operation of the engine.
Hot coolant can also be released when the
engine is stopped.
b. Hot coolant is released from the coolant
system but not through the pressure cap
during normal operation of the engine. Hot
coolant can also be released when the engine
is stopped.
c. Coolant must be added frequently to the
cooling system. The coolant is not released
through the pressure cap or through an
outside leak.
2. If any of the conditions in Step 1 exist, perform the
following procedures:
a. Run the engine at medium idle, which is
approximately 1200 rpm, for 3 minutes after
the high idle shuts off. Running the engine at
medium idle will allow the engine to cool
before the engine is stopped.
b. Inspect the poly v-belt for wear or for damage.
If necessary, replace the poly v-belt. Refer to
Operation and Maintenance Manual,
“Alternator and Fan Belts - Replace” for the
correct procedure.
3. Refer to Visual Inspection Of The Cooling System
in order to determine if a leak exists in the cooling
system.
a. Refer to Testing The Radiator And Cooling
System For Leaks procedures.
4. If the coolant does not flow through the radiator
and through other components of the cooling
system, perform the following procedures.
a. Perform the Testing The Water Temperature
Regulator procedures.
b. Clean the radiator and other components with
hot water or steam at low pressure. Detergent
in the water may also be used. Compressed
air may be used to remove materials from the
cooling system. Identify the cause of the
restriction before you choose the method for
cleaning.
c. Straighten any fins of the radiator if the fins are
bent.
5. Check the high idle of the engine. The engine may
overheat if the high idle rpm is set too high.
i03577882
Cooling System - Inspect
This engine has a pressure type cooling system. A
pressure type cooling system gives two advantages:
• The pressure type cooling system can operate
safely at a higher temperature than the boiling
point of water at different atmospheric pressure
ranges.
• The pressure type cooling system prevents
cavitation in the water pump.
Cavitation is the sudden generation of low pressure
bubbles in liquids by mechanical forces. The
generation of an air or steam pocket is much more
difficult in a pressure type cooling system.
Regular inspections of the cooling system should be
made in order to identify problems before damage
can occur. Visually inspect the cooling system before
tests are made with the test equipment.
Visual Inspection Of The Cooling
System
1. Check the coolant level in the cooling system.
2. Look for leaks in the system.
Note: A small amount of coolant leakage across the
surface of the water pump seals is normal. This
leakage is required in order to provide lubrication for
this type of seal. A hole is provided in the water pump
housing in order to allow this coolant/seal lubricant to
drain from the pump housing. Intermittent leakage of
small amounts of coolant from this hole is not an
indication of water pump seal failure.
3. Inspect the radiator for bent fins and other
restriction to the flow of air through the radiator.
4. Inspect the drive belt for the fan.
5. Inspect the blades of the fan for damage.
70 UENR0623
Cooling System
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