NOTICE
Turbocharger bearing failures can cause large quan-
tities of oil to enter the air intake and exhaust sys-
tems. Loss of engine lubricant can result in serious
engine damage.
Minor leakage of oil into a turbocharger under ex-
tended low idle operation should not cause problems
as long as a turbocharger bearing failure has not
occured.
When a turbocharger bearing failure is accompanied
by a significant engine performance loss (exhaust
smoke or engine rpm up at no load), do not continue
engine operation until the turbocharger is renewed.
A visual inspection of the turbocharger can minimize
unscheduled downtime. A visual inspection of the
turbocharger can also reduce the chance for potential
damage to other engine parts.
Removal and Installation
Note:
The turbochargers that are supplied are
nonserviceable.
For options regarding the removal, installation, repair
and replacement, consult your Caterpillar dealer.
Refer to the Service Manual for this engine for the
procedure and specifications.
Inspecting
NOTICE
The compressor housing for the turbocharger must
not be removed from the turbocharger for cleaning.
The actuator linkage is connected to the compressor
housing. If the actuator linkage is moved or disturbed
the engine may not comply with emmissions
legislation.
1.
Remove the pipe from the turbocharger exhaust
outlet and remove the air intake pipe to the
turbocharger. Visually inspect the piping for the
presence of oil. Clean the interior of the pipes in
order to prevent dirt from entering during
reassembly.
2.
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.
3.
Inspect the bore of the housing of the turbine outlet
for corrosion.
4.
Fasten the air intake pipe and the exhaust outlet
pipe to the turbocharger housing.
i00632301
Walk-Around Inspection
SMCS Code:
1000-040
Inspect the Engine for Leaks and
for Loose Connections
A walk-around inspection should only take a few
minutes. When the time is taken to perform these
checks, costly repairs and accidents can be avoided.
For maximum engine service life, make a thorough
inspection of the engine compartment before starting
the engine. Look for items such as oil leaks or
coolant leaks, loose bolts, worn belts, loose
connections and trash buildup. Make repairs, as
needed:
• The guards must be in the proper place. Repair
damaged guards or replace missing guards.
• Wipe all caps and plugs before the engine is
serviced in order to reduce the chance of system
contamination.
NOTICE
For any type of leak (coolant, lube, or fuel) clean up
the fluid. If leaking is observed, find the source and
correct the leak. If leaking is suspected, check the flu-
id levels more often than recommended until the leak
is found or fixed, or until the suspicion of a leak is
proved to be unwarranted.
NOTICE
Accumulated grease and/or oil on an engine or deck
is a fire hazard. Remove this debris with steam clean-
ing or high pressure water.
• Ensure that cooling lines are properly clamped
and tight. Check for leaks. Check the condition of
all pipes.
• Inspect the water pump for coolant leaks.
Note:
The water pump seal is lubricated by coolant in
the cooling system. It is normal for a small amount of
leakage to occur as the engine cools down and the
parts contract.
Excessive coolant leakage may indicate the need to
replace the water pump seal. For the removal of
water pump and the installation of water pump and/or
seals, refer to the Service Manual for the engine or
consult your Caterpillar dealer.
90
SEBU8312-03
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