(Table 92, contd)
Troubleshooting Test Steps
Values Results
5. Quality of Oil
Note: The nominal viscosity of the lubricating oil that is used in
the engine will affect the rate of fuel consumption. The viscosity
of lubricating oil is defined by the SAE grade of the lubricating
oil. The grade of the lubricating oil must be correct for the ambi-
ent conditions. Lubricating oil for high ambient temperatures will
affect fuel consumption in cold ambient temperatures.
A. Check that the engine oil meets the required specification.
Refer to “Engine Oil” in the Operation and Maintenance Manual,
“Refill Capacities”.
Engine oil
quality
Result: The engine oil does not meet the required
specification.
Repair: Drain and fill the oil system with oil of an acceptable
quality. Refer to the applicable sections in the Operation
and Maintenance Manual.
Result: The engine oil meets the required specification.
Proceed to Test Step 6.
6. Coolant Temperature
Note: The operating temperature of the engine will affect the
rate of fuel consumption. Operation of the engine below the cor-
rect temperature will increase fuel consumption. Failure of the
water temperature regulator can prevent the engine from oper-
ating at the correct temperature.
A. Check that the water temperature regulator is operating cor-
rectly. Refer to Systems Operation, Testing, and Adjusting,
“Water Temperature Regulator - Test”.
Coolant
temperature
Result: The water temperature regulator is not operating
correctly.
Repair: Replace the water temperature regulator. Verify
that the repair corrected the fault.
Result: The water temperature regulator is operating
correctly.
Proceed to Test Step 7.
7. Prolonged Operation at Idle Speed
Note: Prolonged operation of the engine at idle speed increases
fuel consumption.
A. Check for extended periods of engine operation at idle
speed.
Extended idle
operation
Result: The engine is operating at idle speed for extended
periods.
When possible, stop the engine to conserve fuel.
Result: The engine is not operating at idle speed for ex-
tended periods.
Proceed to Test Step 8.
8. Air Intake and Exhaust System
A. Check the air filter restriction indicator, if equipped.
B. Check the air intake and exhaust systems for the following
defects:
· Blockages
· Restrictions
· Damage to lines or hoses
Air and Exhaust
System
restrictions
Result: The air filter is restricted.
Repair: Replace the air filter.
Result: There are system restrictions.
Repair: Refer to Systems Operation/Testing and Adjusting,
“Air Inlet and Exhaust System” for additional information on
the air inlet and exhaust systems.
Result: The air intake and exhaust system is OK.
Proceed to Test Step 9.
(continued)
188 UENR4469-36
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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