Troubleshooting

Table 26
Troubleshooting Test Steps
Values Results
1. Contaminated Oil
A. Check an oil sample for contamination with fuel. Refer to Trou-
bleshooting, “Oil Contains Fuel”.
Oil contains fuel Result: The engine oil is contaminated with fuel.
Repair: Investigate the cause. Refer to Troubleshooting,
“Oil Contains Fuel”.
Result: The engine oil is not contaminated with fuel.
Proceed to Test Step 2.
2. Leaks in Air Intake System
A leak in the air intake system may allow unfiltered air into the
engine.
A. Inspect the air intake system for streaks which may indicate a
leakage of unfiltered air. Inspect all of the gaskets and the connec-
tions. Refer to Systems Operation, Testing, and Adjusting, “Air In-
let and Exhaust System”.
Leaks in Air In-
take System
Result: Leaks found in air intake system.
Repair: Repair any leaks.
Result: The air intake system is OK.
Proceed to Test Step 3.
3. Engine History
A. Check that the engine has been serviced to the correct mainte-
nance intervals. Refer to Operation and Maintenance Manual,
“Maintenance Interval Schedule”
B. Check the engine history for frequent starting and stopping in
cold conditions.
Note: Frequent starting and stopping of the engine can cause
early wear. Also, operation of the engine for short periods of time
in cold conditions can cause early wear.
Maintenance
intervals
Result: The engine is not correctly maintained.
Repair: Make sure that the engine is maintained at the
correct maintenance intervals. Refer to the Operation and
Maintenance Manual, “Maintenance Interval Schedule”.
Result: The engine is correctly maintained.
Proceed to Test Step 4.
4. Low Oil Pressure
A. Check for frequently logged diagnostic codes relating to low oil
pressure.
Low oil pressure Result: The engine has a history of low oil pressure.
Repair: Refer to Troubleshooting, “Oil Pressure Is Low”.
Result: There are no logged diagnostic codes for low oil
pressure.
Proceed to Test Step 5.
5. Dirt in Engine Oil
A. Check the engine oil for dirt or debris.
Dirt in engine oil Result: The engine oil shows signs of dirt or debris
Repair: Drain the oil from the crankcase and refill the
crankcase with clean engine oil. Install new engine oil fil-
ters. Refer to the Operation and Maintenance Manual for
more information.
Result: The engine oil is clean.
Proceed to Test Step 6.
(continued)
66 UENR0612-07
Symptom Troubleshooting
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