(Table 70, contd)
Troubleshooting Test Steps
Values Results
4. Dirt in Fuel
A. Remove the fuel filters. Inspect the fuel filters for
contamination.
Note: Contaminants in the fuel such as hydrogen sulfide and sul-
fur can lead to the formation of acids in the crankcase.
B. Obtain a fuel analysis.
Fuel and fuel
filters
Result: The fuel has contamination.
Repair: Determine the cause of any contamination and
make the necessary repairs.
Install new fuel filters. Refer to the Operation and Mainte-
nance Manual.
Result: The fuel is not contaminated.
Proceed to Test Step 5.
5. Low Oil Pressure
Note: Engine oil that is contaminated with another liquid can
cause low engine oil pressure. High engine oil level can be an in-
dication of contamination.
A. Obtain an analysis of the engine oil.
B. Check the inlet screen on the suction tube and remove any ma-
terial that may be restricting engine oil flow.
Note: The inlet screen of the suction tube for the engine oil pump
can have a restriction. This restriction will cause cavitation and a
loss of engine oil pressure.
Note: When some components of the engine show wear in a short
time, the cause can be a restriction in a passage for engine oil. An
indicator for the engine oil pressure may indicate sufficient pres-
sure, but a component is worn due to a lack of lubrication. In such
a case, look at the passage for the engine oil supply to the compo-
nent. Refer to Systems Operation/Testing and Adjusting, “Lubrica-
tion System” for additional information.
Oil pressure Result: Analysis indicates that the oil is contaminated.
Repair: Replace the oil and the oil filter. Refer to the Op-
eration and Maintenance Manual.
Result: The inlet tube has a restriction.
Repair: Clear the obstruction. Verify the repair.
Result: The oil pressure is low.
Refer to Troubleshooting, “Oil Pressure Is Low” for the
testing procedure. Repair any identified faults.
Result: The oil pressure is normal.
Contact the Dealer Solutions Network (DSN).
i07119342
Engine Has Mechanical Noise
(Knock)
Probable Causes
• Active codes and logged codes
• Electrical connections
• Fuel injection
• Fuel quality
• Lubrication
• Engine accessory
• Valve train components
• Pistons and connecting rods
• Crankshaft
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
144 UENR4469-36
Symptom Troubleshooting
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