Page 70
TROUBLESHOOTING
Core Inspection
GUIDELINES
With the exception of straightening minor bends
in the cold fins, the CMCAC core is not repairable
and should be replaced when more extensive
damage is encountered. To ensure that the
CMCAC system will function properly after repair
or replacement, a pressure/leak test is
recommended.
INSPECTION
1. Carefully inspect the entire system to
determine the exact location and extent of
damage.
2. Inspect the cold fins and cold bars that run
horizontally in the cooler.
3. Inspect all brazed or welded joints in the
header tank.
CMCAC Preventive Maintenance
In case of engine and/or turbocharger failure, the
charge air cooler should be flushed to make sure
the cooler is free of debris.
FLUSHING PROCEDURE
1. Remove the chassis-mounted cooler and
flush the inside with a safety solvent to
remove oil and other foreign debris.
2. Shake cooler to remove large pieces.
3. Wash with hot, soapy water. Rinse with
clean water and blow dry with compressed
air in the reverse direction of flow.
4. Carefully inspect cooler to ensure
cleanliness.
Do not use caustic cleaners when flushing the
cooler. Be extremely careful when handling the
cooler so as not to damage the core.
Damage
Core Failures
Recommended Repair
Procedure
System Check
Repairable
Bent cold fins
Straighten with small
screwdriver or pair of small
needlenose pliers.
Perform pressure/leak test.
Nonrepairable
All header tank-to-core
separations
No repair procedure is
recommended — replace
unit.
Perform pressure/leak test.
All header tank cracks
No repair procedure is
recommended — replace
unit.
Perform pressure/leak test.
Internal fins damaged and
separated from tube plate
No repair procedure is
recommended — replace
unit.
Perform pressure/leak test.
Tube blockage
No repair procedure is
recommended — replace
unit.
Perform pressure/leak test.
Tube/plate cracks or welds,
cold bar separations or
openings
No repair procedure is
recommended — replace
unit.
Perform pressure/leak test.
Excessive cold fin damage
(original shape of fins
distorted beyond repair)
No repair procedure is
recommended — replace
unit.
Perform pressure/leak test.
5_106_00.bk Page 70 Friday, August 4, 2000 11:17 AM
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