TM 9-4310-394-13
Section IV. UNIT TROUBLESHOOTING PROCEDURES.
4-10. INTRODUCTION. This section contains troubleshooting information for locating and correcting most of the
operating troubles which may develop in the air compressor unit. Each malfunction for an individual component, unit, or
system is followed by a list of tests or inspections which will help you to determine corrective actions to take. You should
perform the tests/inspections and corrective actions in the order listed.
In general, engine exhaust is an excellent way to tell what kind of condition your air compressor unit is in. Exhaust color
of black, or bluish-white, smoke is normal before the engine warms up fully. As the engine reaches normal operating
temperature, the exhaust becomes clear or light blue, provided there are no problems. If the exhaust does not clear up,
a problem is indicated.
When exhaust color is abnormal, turn off the engine immediately and notify your supervisor. Use Table 4-2 as a
guideline to exhaust symptoms.
Table 4-2. Troubleshooting by Exhaust Color.
EXHAUST COLOR:
LIKELY INDICATES:
Clear or light bluish condition
Normal operating
Continuous black smoke
Overloading
Seizure of moving part
Incorrect combustion
Continuous bluish-white smoke
Lubricating oil is being
consumed
4-11. UNIT TROUBLESHOOTING. This manual cannot list all malfunctions that may occur, nor all tests or inspections
and corrective actions. If a malfunction is not listed, or is not corrected by listed corrective actions, notify your
supervisor.
Table 4-3 lists the common malfunctions which you may find during the operation or maintenance of the air compressor
unit. You should perform the tests/inspections and corrective actions in the order listed.
4-10
