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Aftercooler Core - Clean/Test
(Air-To-Air Aftercooler)
The air-to-air aftercooler is OEM installed in many
applications. Please refer to the OEM specifications
for information that is related to the aftercooler.
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Aftercooler Core - Inspect
Note: Adjust the frequency of cleaning according to
the effects of the operating environment.
Inspect the aftercooler for these items: damaged fins,
corrosion, dirt, grease, insects, leaves, oil and other
debris. Clean the aftercooler, if necessary.
For air-to-air aftercoolers, use the same methods that
are used for cleaning radiators.
Personal injury can result from air pressure.
Personal injury can result without following prop-
er procedure. When using pressure air, wear a
protective face shield and protective clothing.
Maximum air pressure at the nozzle must be less
than 205 kPa (30 psi) for cleaning purposes.
Pressurized air is the preferred method for removing
loose debris. Direct the air in the opposite direction of
the fans air flow. Hold the nozzle approximately 6 mm
(.25 inch) away from the fins. Slowly move the air
nozzle in a direction that is parallel with the tubes.
The pressurized air will remove debris that is
between the tubes.
Pressurized water may also be used for cleaning.
The maximum water pressure for cleaning purposes
must be less than 275 kPa (40 psi). Use pressurized
water in order to soften mud. Clean the core from
both sides.
Use a degreaser and steam for removal of oil and
grease. Clean both sides of the core. Wash the core
with detergent and hot water. Thoroughly rinse the
core with clean water.
After cleaning, start the engine and accelerate the
engine to high idle rpm. This will help in the removal
of debris and drying of the core. Stop the engine. Use
a light bulb behind the core in order to inspect the
core for cleanliness. Repeat the cleaning, if
necessary.
Inspect the fins for damage. Bent fins may be opened
with a “comb”.
Note: If parts of the aftercooler system are repaired
or replaced, a leak test is highly recommended. For
more information, refer to OEM specification for the
aftercooler.
Inspect these items for good condition: welds,
mounting brackets, air lines, connections, clamps
and seals. Make repairs, if necessary.
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Alternator - Inspect
Perkins recommends a scheduled inspection of the
alternator. Inspect the alternator for loose
connections and correct battery charging. Check the
ammeter (if equipped) during engine operation in
order to ensure correct battery performance and/or
correct performance of the electrical system. Make
repairs, as required.
Check the alternator and the battery charger for
correct operation. If the batteries are correctly
charged, the ammeter reading should be very near
zero. All batteries should be kept charged. The
batteries should be kept warm because temperature
affects the cranking power. If the battery is too cold,
the battery will not crank the engine. When the
engine is not run for long periods of time or if the
engine is run for short periods, the batteries may not
fully charge. A battery with a low charge will freeze
more easily than a battery with a full charge.
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Alternator and Fan Belts -
Replace
Refer to Disassembly and Assembly Manual,
“Alternator Belt - Remove and Install”.
Ensure that ALL grooved pulley and idlers that the
belt operates rotate freely. Ensure that all grooves
are clean and free from damage.
SEBU8731-04
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Maintenance Section
Aftercooler Core - Clean/Test
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