(Table 126, contd)
Troubleshooting Test Steps
Values Results
5. Air Intake and Exhaust System
A. Check the air filter restriction indicator, if equipped.
Check the air intake and the exhaust system for the following
defects:
· Signs of dirt ingress
· Blockages
· Restrictions
· Damage to the air intake and exhaust lines and hose
Air intake and
exhaust system
Result: The air filter restriction indicator has operated or the
air filter is blocked.
Repair: Make sure that the air filter is clean and serviceable.
If necessary, replace the air filter.
Result: The air intake or the exhaust system is blocked, re-
stricted, or damaged.
Repair: Repair the air intake or the exhaust system, as
required.
Result: The air intake or the exhaust system is OK.
For engines that have a single turbocharger, proceed to Test
Step 6.
For engines that have two turbochargers, proceed to Test
Step 7.
6. Turbocharger
Note: This step is only applicable to engines that have a sin-
gle turbocharger.
Note: The turbocharger that is installed on this engine is a
non-serviceable item. If any mechanical fault exists, then the
turbocharger must be replaced.
A. Check that the oil drain for the turbocharger is not blocked
or restricted.
B. Remove the turbocharger compressor outlet duct to check
for evidence of a turbocharger internal oil leak.
Turbocharger Result: The oil drain for the turbocharger is blocked or
restricted.
Repair: Remove the blockage or restriction. If necessary, re-
place the oil drain line.
Result: The turbocharger has an internal oil leak.
Repair: Replace the turbocharger. If equipped, check the front
face of the Diesel Particulate Filter (DPF) for contamination
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 turbocharger is OK.
Proceed to Test Step 8.
(continued)
236 UENR4469-36
Symptom Troubleshooting
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