Note: Adjust the frequency of inspection according to the effects of the operating environment.
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Right side view of aftercooler (1) Hood (2) Precleaner (3) Aftercooler (4) Plate | |
Remove the access panels or open the access panels for the aftercooler. Remove the plates (4) on the bottom of the aftercooler.
Inspect the aftercooler for these items: damaged fins, corrosion, dirt, grease, insects, leaves, oil and other debris. Clean the aftercooler, if necessary.
Inspect the fan group for these items: damage to fan, oil leaks, worn hoses and loose fasteners. Make repairs, if necessary.
Note: If parts of the aftercooler system may appear to be damaged or if parts of the aftercooler system are repaired, a leak test is highly recommended. Refer to Special Instruction, SEHS8622, "Using the FT1984 Air-to-Air Aftercooler Leak Test Group". The FT-1984 Aftercooler Testing Group can be used for aftercoolers that have hoses with an inside diameter of
Inspect the fins and tubes of the aftercooler for damage. Some fins and tubes may be worn from abrasive material that has passed through the aftercooler cores. If the aftercooler cores are worn from abrasive material, the aftercooler cores may be removed and the positions of the aftercooler cores may be switched. The core on the left side of the machine may be switched with the core on the right side of the machine. By switching the positions of the aftercooler cores, an unworn surface will face the direction of the airflow. Refer to Disassembly and Assembly, "Aftercooler - Remove and Install". Bent fins may be opened with a “comb”.
Inspect these items for good condition: welds, mounting brackets, air lines, connections, clamps and seals. Make repairs, if necessary.
Note: Adjust the frequency of cleaning according to the effects of the operating environment.
For air-to-air aftercoolers, use the same methods that are used for cleaning radiators. Remove the plates on the side of the aftercooler.
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Personal injury can result from air pressure. Personal injury can result without following proper procedure. When using pressure air, wear a protective face shield and protective clothing. Maximum air pressure at the nozzle must be less than |
Pressurized air is the preferred method for removing loose debris. Direct the air in the opposite direction of the fan's air flow. Hold the nozzle approximately
Pressurized water may also be used for cleaning. The maximum water pressure for cleaning purposes must be less than
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.
For more detailed information on cleaning and inspection, see Special Publication, SEBD0518, "Know Your Cooling System".