An inspection of the turbocharger can minimize
unscheduled downtime. An inspection of the
turbocharger can also reduce the chance for potential
damage to other engine parts.
Note: Turbocharger components require precision
clearances. The turbocharger cartridge must be
balanced due to high rpm. Severe Service
Applications can accelerate component wear. Severe
Service Applications require more frequent
inspections of the cartridge.
Removal and Installation
For options regarding the removal, installation, repair,
and replacement, consult your Cat dealer. Refer to
the Service Manual for this engine for the procedure
and specifications.
Cleaning and Inspecting
1. Remove the exhaust outlet piping and remove the
air inlet piping from 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. 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 must be reconditioned.
3. Check the compressor wheel for cleanliness. If
only the blade 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.
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 inlet air (plugged air filters), which causes the
turbocharger to slobber.
4. Inspect the bore of the turbine housing for
corrosion.
5. Clean the turbocharger housing with standard
shop solvents and a soft bristle brush.
6. Fasten the air inlet piping and the exhaust outlet
piping 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.
SEBU7125-13
151
Maintenance Section
Walk-Around Inspection
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