70 SEBU8191-01
Maintenance Section
Turbocharger - Inspect
•
Loose connecti
ons
•
Corrosion
•
Wires that are worn or frayed
•
Cleanliness
Make repairs, if necessary.
The starting motor pinion and the flywheel ring gear
must be in good condition in order for the engine
to start pro
perly. The engine will not start if the
starting motor pinion does not engage the flywheel
ring gear. The teeth of the starting motor pinion and
the flywhee
l ring gear can be damaged because of
irregular engagement.
Inspect th
e starting motors for proper operation.
Listen for grinding when the engine is started.
Inspect the teeth of the starting motor pinions and the
flywheel r
ing gear. Look for patterns of wear on the
teeth. Look for teeth that are broken or chipped. If
damaged teeth are found, the starting motor pinions
and the fly
wheel ring gear must be replaced.
Refer to the Operation Manual TSL4165 for
informa
tion on removing the starting motors and
installing the starting motors.
i04328054
Turboc harger - Inspect
Periodic inspection and cleaning is recommended
for the turbochargers. Fouling of the turbine wheels
can contribute to loss of engine power and overall
loss of engine efficiency.
If a turbocharger fails during engine operation,
damage to the turbocharger compressor wheel
and/or to the engine may occur. Damage to a
turbocharger compressor wheel could allow parts
from the compressor wheel to enter an engine
cylinder. This can cause additional damage to the
pistons, the valves, and the cylinder head.
NOTICE
Turbocharger
bearing failures can cause large quan-
tities of oil to enter the air inlet and exhaust systems.
Loss of engine lubricant can result in serious engine
damage.
Minor leakage of a turbocharger housing under ex-
tended low id
le operation should not cause problems
as long as a turbocharger bearing failure has not oc-
curred.
When a turbocharger bearing failure is accompanied
by a significant engine performance loss (exhaust
smoke or eng
ine rpm up at no load), do not continue
engine operation until the turbocharger is repaired or
replaced.
An inspection of the turbochargers can minimize
unscheduled downtime. Also, the chance for potential
damage to other engine parts is reduced.
Note: Turbocharger components require clearances
that are precise. The turbocharger cartridge must be
balanced due to high rpm.
The following conditions can cause a turbocharger to
be out-of-balance:
•
The buildup of deposits
•
Chipping and/or flaking of deposits
If the turbocharger must be removed for inspection,
use caution. Do not break deposits from the turbine
wheel. Do not attempt to clean the turbine wheel. For
options regarding removal, installation, repair and
replacement, refer to the Service Manual, or consult
a Perkins distributor.
1. Remove the exhaust outlet piping and remove
the air inlet piping from the turbocharger. Visually
inspect the piping for the presence of oil.
2. Turn the compressor wheel and the turbine wheel
by hand. The assembly should turn freely. Inspect
the compressor wheel and the turbine wheel for
contact with the turbocharger housing. There
should not be any visible signs of contact between
the turbine wheel or compressor wheel and the
turbocharger housing. If there is any indication of
contact between the rotating turbine wheel or the
compressor wheel and the turbocharger housing,
the turbocharger should be reconditioned.
3. Check the compressor wheel for cleanliness.
If only the inlet side of the wheel is dirty, dirt
and/or moisture is passing through the air filtering
system. If oil is found only on the back side of the
wheel, there is a possibility of a failed turbocharger
oil seal.
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