KENR6933 67
Troubleshooting Section
3. Check that the compressor housing for the
turbocharger i
s free of dirt and debris.
4. Check that the turbine housing for the turbocharger
is free of dirt
and debris.
5. Check that the turbine blades rotate freely in the
turbocharger
.
6. Ensure that the wastegate on the turbocharger is
adjusted corr
ectly. Refer to Testing and Adjusting,
“Wastegate - Inspect”. If the wastegate actuator
is faulty, replace the wastegate actuator. Refer
to Disassemb
ly and Assembly, “T urbocharger -
Disassemble” and Disassembly and Assembly,
“Turbocharger - Assemble”.
7. If necessary, replace the turbocharger. Refer
to Disassembly and Assembly, “T urbocharger
- Remove” an
d Disassembly and Assembly,
“Turbocharger - Install”.
8. Check that t
he repairs have eliminated the faults.
9. If the fault has not been eliminated, proceed to
“Fuel Suppl
y”.
Fuel Supply
1. Visually check the fuel tank for fuel. The fuel
gauge may be faulty.
2. Ensure that the fuel supply valve (if equipped) is
in the full OPEN position.
3. If the temperature is below 0 °C (32 °F), check
for solidified fuel (wax).
4. Check the primary filter/water separator for water
in the fuel.
5. Check for fuel supply lines that are restricted.
6. Check that
the low pressure fuel lines are tight
and secured properly.
7. Check the f
uel filters.
8. Check the diesel fuel for contamination. Refer to
Testi n g a
nd Adjusting, “Fuel Quality - Test”.
9. Check for air in the fuel system. Refer to Testing
and Adjus
ting, “Air in Fuel - Test”.
10. Ensure that the fuel system has been primed.
Refer to T
esting and Adjusting, “Fuel System -
Prime”.
11. Check the
fuel pressure. Refer to Testing and
Adjusting, “Fuel System Pressure - Test”.
12. If the rep
air does not eliminate the fault refer to
“Low Compression (Cylinde r 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 any faults.
Possible causes of low compression are shown
in the following list:
•
Loose glow plugs
•
Faulty piston
•
Faulty 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 repair does not eliminate the fault refer to
“Individual Malfunctioning Cylinders”.
Individual Malfunctioning Cylinders
1. Use the elect
ronic service tool to perform the
“Cylinder Cut-out Test”. Note if there is any
reduction in engine speed. If a reduction in engine
speed is not
noted, the isolated cylinder is not
operating under normal conditions. If the isolation
of a particular cylinder results in a reduction of
engine spee
d that is less than normal, this may
indicate that the cylinder is operating below normal
performance. Investigate the cause of the fault on
any cylinde
r that is not operating. Investigate the
cause of the fault on any cylinder that is operating
below normal performance.
2. If all cylinders have been checked and no
faults were detected proceed to “Electronic Unit
Injectors
”.
Electronic Unit Injectors
1. Use the electronic service tool to perform the
“Cylinder Cut-out Test”. Note if there is any
reductio
n in engine speed. If a reduction in engine
speed is not noted, the isolated electronic unit
injector is not operating under normal conditions.
If the iso
lation of a particular cylinder results in a
reduction of engine speed that is less than normal,
this may indicate that the electronic unit injector is
operati
ng below normal performance.
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