(Table 27, contd)
Troubleshooting Test Steps
Values Results
6. Water Temperature Regulator
A. Check the water temperature regulator for correct operation.
Refer to Systems Operation, Testing, and Adjusting, “Cooling Sys-
tem” for the proper procedure.
Water Temper-
ature Regulator
Result: The water temperature regulator is not operating
correctly.
Repair: Replace the water temperature regulator. Refer
to Disassembly and Assembly, “Water Temperature Regu-
lator - Remove and Install”.
Result: The water temperature regulator is operating
correctly.
Proceed to Test Step 7.
7. Engine Cooling Fan
A. Check that the cooling fan is operating correctly.
B. Check the engine cooling fan for damage.
Fan Result: The cooling fan is not operating correctly.
Repair: Make sure that the cooling fan is being driven cor-
rectly. Make sure that the belt tensioner is operating
correctly
Result: The fan is damaged.
Repair: Repair the fan or replace the fan, as necessary.
Refer to Disassembly and Assembly, “Fan - Remove and
Install”.
Result: The fan is OK.
Proceed to Test Step 8.
8. Quality of Coolant
A. Check the quality of the coolant. Refer to the Operation and
Maintenance Manual, “Refill Capacities and Recommendations -
Coolant”.
Coolant Result: The coolant is not of an acceptable quality.
Repair: Drain and refill the coolant system with coolant of
the correct quality. Refer to the Operation and Mainte-
nance Manual, “Refill Capacities and Recommendations -
Coolant”.
Result: The coolant is of an acceptable quality.
Proceed to Test Step 9.
9. Inspection of the Coolant Pump
A. Inspect the impeller of the coolant pump for damage and/or
erosion.
B. Make sure that the drive gear is not loose on the drive shaft of
the coolant pump.
Coolant pump Result The coolant pump is damaged or not operating
correctly.
Repair: If necessary, replace the coolant pump. Refer to
Disassembly and Assembly, “Water Pump - Remove” and
Disassembly and Assembly, “Water Pump - Install”.
Result The coolant pump is not damaged and the pump
is operating correctly.
Proceed to Test Step 10.
(continued)
88 UENR4469-36
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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