106 SEBU8603-01
Maintenance Section
Turbocharger - Inspect
Check the start
ing motor for correct operation. Check
the electrical connections and clean the electrical
connections. Refer to the Systems Operation, Testing
and Adjusting
Manual, “Electric Starting System -
Test” for more information on the checking procedure
and for specifications or consult your Perkins dealer
or your Perki
ns distributor for assistance.
i04287011
Tu rb oc harger - Ins pe ct
Hot engine components can cause injury from
burns. Be
fore performing maintenance on the
engine, allow the engine and the components to
cool.
NOTICE
Turbocharger bearing failures can cause large quanti-
ties of oil to enter the air intake and exhaust systems.
Loss of engine lubricant can result in serious engine
damage.
Minor leakage of oil into a turbocharger under extend-
ed low idle operation should not cause problems as
long as a turbocharger bearing failure has not oc-
curred.
If a turbocharger failure is suspected do not operate
the engine. A failure of the turbocharger can be sig-
naled by significant loss of engine performance and
erratic RPM at no load. Also, large quantities of en-
gine oil could pass into the engine air intake. This oil
would have been seen as smoke from the engine ex-
haust. Applications that have a DPF installed will filter
theengineexhaust.
A visual inspection of the turbocharger or
turbochargers can minimize unscheduled downtime.
A visual inspection of the turbocharger or
turbochargers can also reduce the chance for
potential damage to other engine parts. Do not
inspect the engine with the engine in operation.
g02178129
Illustration 69
Typical example
1. Ensure that the turbocharger is clean and free from
dirt before removing components for inspection.
2. Remove the pipe from the turbocharger exhaust
outlet and remove the air intake pipe (1). Visually
inspect the piping for the presence of oil. Clean
the interior of the pipes in order to prevent dirt
from entering during reassembly.
3. Check for abnormal heat discoloration of the
turbocharger. Check for any loose bolts or any
missing bolts. Check for damage to the oil supply
line and the oil drain line. Check for cracks in
the housing of the turbocharger. Ensure that the
compressor wheel can rotate freely. Check for
signs of damage to the compressor wheel, or
contact of the compressor wheel to the body of
the compressor housing.
4. Check for the presence of oil. If oil is leaking from
the back side of the compressor wheel, there is a
possibility of a failed turbocharger oil seal.
The presence of oil may be the result of extended
engine operation at low idle. The presence of
oil may also be the result of a restriction of the
line for the intake air (clogged air filters), which
causes the turbocharger to slobber. For more
information, refer to Systems Operation, Testing,
and Adjusting, “Turbocharger - Inspect”.
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