(Table 126, contd)
Troubleshooting Test Steps
Values Results
7. Turbochargers
Note: This step is only applicable to engines that have two
turbochargers.
Note: The turbochargers that are installed on this engine are
non-serviceable items. If any mechanical fault exists, then the
faulty turbocharger must be replaced.
A. Check that the oil drains for the turbochargers are not
blocked or restricted.
B. Remove the turbocharger compressor outlet ducts to
check for evidence of a turbocharger internal oil leak.
Turbochargers Result: The oil drain for a turbocharger is blocked or
restricted.
Repair: Remove the blockage or restriction. If necessary, re-
place the oil drain line.
Result: A turbocharger has an internal oil leak.
Repair: Replace the faulty turbocharger. If equipped, check
the front face of the Diesel Particulate Filter (DPF) for contam-
ination with oil.
If oil is found on the inlet face of the DPF, refer to Trouble-
shooting, “Exhaust System Contains Oil”.
Check that the repairs have eliminated the faults.
Result: The turbochargers are OK.
Proceed to Test Step 8.
8. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation,
Testing, and Adjusting, “Compression - Test”.
Cylinder
compression
Result: The results of the compression test are outside the
specifications.
Repair: Investigate the cause and rectify any faults.
Note: Possible causes of low compression are shown in the
following list:
· Loose glow plugs
· Worn piston
· Worn piston rings
· Worn cylinder bores
· Worn valves
· Faulty cylinder head gasket
· Damaged cylinder head
Result: The results of the compression test are OK.
Contact the Dealer Solutions Network (DSN).
i07865391
Oil Contains Coolant
Probable Causes
• Engine oil cooler
• Engine water pump
• Cylinder head and gasket
• Cylinder block
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
UENR4469-36 237
Symptom Troubleshooting
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