Troubleshooting

(Table 34, contd)
Troubleshooting Test Steps
Values Results
5. Turbocharger
Note: The turbocharger that is installed on the engine is a
non-serviceable item. If any mechanical fault exists, then the
faulty turbocharger must be replaced.
A. Ensure that the mounting bolts for the turbocharger are
tight.
B. Check that the oil drain for the turbocharger is not blocked
or restricted.
C. Check that the compressor housing for the turbocharger is
free of dirt and debris. Make sure that the housing is not
damaged.
D. Check that the turbine housing for the turbocharger is free
of dirt and debris. Make sure that the housing is not damaged.
E. Check that the turbine blades rotate freely in the
turbocharger.
F. Ensure that the wastegate on the turbocharger is adjusted
correctly. Refer to Systems Operation, Testing, and Adjusting,
“Turbocharger - Inspect”. If the wastegate actuator is faulty, re-
place the turbocharger. Refer to Disassembly and Assembly,
“Turbocharger - Remove” and Disassembly and Assembly,
“Turbocharger - Install”.
Turbocharger Result: There is a fault on the turbocharger.
Repair the turbocharger or replace the turbocharger. Refer to
Disassembly and Assembly, “Turbocharger - Remove” and
Disassembly and Assembly, “Turbocharger - Install”.
Result: The turbocharger is OK.
Proceed to Test Step 6.
6. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation,
Testing, and Adjusting, “Compression - Test ”.
Low
compression
Result: Low compression is recorded on one or more
cylinders.
Possible causes of low compression are shown in the follow-
ing list:
·Loose glow plugs
·Faulty piston
·Faulty piston rings
·Worn cylinder bores
·Worn valves
·Faulty cylinder head gasket
·Damaged cylinder head
Make any repairs, as necessary.
Result: No faults found.
Proceed to Test Step 7.
(continued)
84 UENR0612-07
Symptom Troubleshooting
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