KENR6933 57
Troubleshooting Section
Oil Level
1. Check the oil level in the engine.
2. If the oil level
is high, check for contamination
of the oil with coolant. Refer to Troubleshooting,
“Coolant in Engine Oil”.
3. If no contamination is identified, remove any
excess oil.
4. If the oil level is satisfactory, refer to “Air Intake
and Exhaust System”.
Air Intake and Exhaust System
1. Check the air fi
lter restriction indicator, if equipped.
2. Ensure that the air filter is clean and serviceable.
3. Check the air intake and the exhaust system for
the following defects:
•
Blockages
•
Restriction
s
•
Damage to the air intake and exhaust lines and
hoses
4. Make all necessary repairs to the engine.
5. Ensure that the repairs have eliminated the
diagnostic code.
6. If no faults are found, refer to “Turbocharger”.
Turbocharg
er
Note: The turbocharger that is installed on this
engine is a n
onserviceable item. If any mechanical
fault exists, except for the wastegate actuator, then
the turbocharger must be replaced.
1. Check that the oil drain for the turbocharger is not
blocked or restricted.
2. Check the turbocharger for evidence of internal
oil leaks.
3. If necessary, replace the turbocharger. Refer
to Disassembly and Assembly, “T urbocharger
- Remove” a
nd Disassembly and Assembly,
“Turbocharger - Install”.
4. Check that
the repairs have eliminated the faults.
5. If the repairs have not eliminated the fault proceed
to “L ow Com
pression (cylinder pressure)”.
Low Compression (cylinder pressure)
1. Perform a compression test. Refer to Testing and
Adjusting, “Compression - Test ”.
2. If low compression is noted on any cylinders,
investigate the cause and rectify the cause.
Possible causes of low compression are shown
in the following list:
•
Loose glow plugs
•
Faulty piston
•
Worn piston rings
•
Worn cylinder bores
•
Worn valves
•
Faulty cylinder head gasket
•
Damaged cylinder head
3. Perform all ne
cessary repairs.
4. Ensure that the repairs have eliminated the faults.
5. If the fault is not eliminated, refer to the
Troubleshooting Manual for your engine
application
.
i02528865
Excessive Fuel Consump tio n
Probable Causes
•
Diagnostic
codes
•
Misreading of fuel level
•
Fuel quality
•
Quality of o
il
•
Low engine temperature
•
Prolonged operation at idle speed
•
Engine oper
ating speed
•
Air intake and exhaust system
•
Reduced pressure of intake air
•
Excessive v
alve lash
•
Failure of the primary speed/timing sensor
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