Troubleshooting

Table 50
Troubleshooting Test Steps
Values Results
1. Coolant Level
A. Check that the coolant is filled to the correct level.
Note: If the coolant level is too low, air will get into the cooling
system. Air in the cooling system will cause a reduction in
coolant flow.
Coolant Result: The coolant level is low.
Repair: Fill the coolant system to the correct level. Refer to
the Operation and Maintenance Manual, “Coolant Level -
Check”.
Result: The coolant level is OK.
Proceed to Test Step 2.
2. Air-to-Air Aftercooler (ATAAC)
A. Check the ATAAC for debris or damage.
Note: Debris between the fins of the ATAAC core restricts air
flow through the core.
ATAAC Result: The ATAAC has excessive debris or is damaged.
Repair: Clear the debris from the ATAAC or replace the
ATAAC.
Result: The ATAAC is OK.
Proceed to Test Step 3.
3. Cooling Fan
A. Check the operation of the cooling fan.
Note: A fan that is not turning at the correct speed can result
in insufficient airflow through the aftercooler core.
Cooling fan Result: The cooling fan is not operating correctly.
Repair: Investigate the cause of the incorrect fan operation
Result: The cooling fan is operating correctly.
Proceed to Test Step 4.
4. Air Intake and Exhaust System
A. Check the air intake and exhaust system for the following
defects:
· Blockages
· Restrictions
· Damage to the air intake ducts and hoses
· Loose connections and air leaks
Air intake and
exhaust
Result: The air intake or exhaust system is blocked, re-
stricted, damaged, or loose.
Repair: Make all necessary repairs to the air intake system.
Result: The air intake and exhaust system is OK.
Proceed to Test Step 5.
5. Ambient Temperature
A. Check for a high ambient temperature.
Note: When outside temperatures are too high, there is insuf-
ficient temperature difference between the outside air and the
intake air.
Ambient
Temperature
Result: The ambient air temperature is high.
Repair: Operate the engine at reduced speed or reduced
power.
Result: The ambient air temperature is OK.
Proceed to Test Step 6.
(continued)
UENR0612-07 107
Symptom Troubleshooting
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