Table 70
Troubleshooting Test Steps
Values Results
1. Incorrect Maintenance Intervals and/or Incorrect Oil
A. Use engine oil that is recommended and change the engine oil
at the interval that is recommended by the engines Operation and
Maintenance Manual.
Maintenance
intervals
Result: The engine oil was not changed at the interval
that is recommended by the Operation and Maintenance
Manual.
Repair: Use the recommended grade of oil.
Change the engine oil at the interval that is recom-
mended. Repair or replace any damaged parts.
Result: The engine oil was changed at the interval that is
recommended by the engines Operation and Mainte-
nance Manual.
Proceed to Test Step 2.
2. Contaminated Engine Oil
A. Obtain an oil analysis. The analysis will identify oil
contamination.
B. Check the oil filter bypass valve.
Note: If the oil filter bypass valve is open, the oil will not be
filtered.
Contamination Result: The oil is contaminated.
Repair: Determine the reason for any contamination of
the engine oil and make the necessary repairs. Drain the
crankcase and refill the crankcase with clean engine oil.
Install new engine oil filters. Refer to the engines Opera-
tion and Maintenance Manual.
Result: The oil filter bypass valve is open.
Repair: Replace the oil filter element. Refer to the Opera-
tion and Maintenance Manual.
Check the oil filter bypass valve for a weak spring or for a
broken spring. If the spring is broken, replace the spring.
Verify that the oil bypass valve is operating correctly.
Result: The oil is not contaminated.
Proceed to Test Step 3.
3. Leaks in Air Intake System
Note: 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” for more information.
Air leak Result: There are air leaks.
Repair: Repair any leaks.
Result: There are no air leaks.
Proceed to Test Step 4.
(continued)
UENR4469-36 143
Symptom Troubleshooting
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