Troubleshooting

(Table 38, contd)
Troubleshooting Test Steps
Values Results
4. Fuel Quality
Note: The grade of the fuel affects the rate of fuel consumption.
Refer to the engines Operation and Maintenance Manual for ad-
ditional information.
Cold weather adversely affects the characteristics of the fuel.
Refer to the Operation and Maintenance Manual for information
on improving the characteristics of the fuel during cold-weather
operation.
A. Check the fuel quality. Refer to Systems Operation, Testing,
and Adjusting, “Fuel Quality - Test”.
B. Refer to Operation and Maintenance Manual for information
on the proper characteristics of the fuel for the engine.
Fuel quality Result: The fuel quality does not meet specifications.
Repair: Drain the fuel system and replace the fuel filters.
Refer to the Operation and Maintenance Manual, “Fuel Sys-
tem Primary Filter (Water Separator) Element - Replace”
and Operation and Maintenance Manual, “Fuel System Fil-
ter - Replace”.
Fill the fuel system with fuel that meets the standard in the
Operation and Maintenance Manual, “Fluid
Recommendations”.
Prime the fuel system. Refer to the Operation and Mainte-
nance Manual, “Fuel System - Prime”.
Result: The fuel quality meets specifications.
Proceed to Test Step 5.
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: Refill the oil system with oil of an acceptable qual-
ity. 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. Engine Accessories and Transmission
A. Check that the engine accessories and transmission are op-
erating correctly.
B. Remove and inspect any engine accessories that may be
adding unexpected load to the engine.
Engine accesso-
ries and
transmission
Result: The engine accessories and transmission are not
OK.
Repair: Make the necessary repairs.
Result: The engine accessories and transmission are OK.
Proceed to Test Step 7.
7. 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 8.
(continued)
92 UENR0612-07
Symptom Troubleshooting
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