TM 5-4310-387-14
5-5. Direct Support Troubleshooting Procedures . Refer to symptom index to locate the troubleshooting procedure
for the observed malfunction. Table 5-1 lists malfunctions that may occur during operation or maintenance of the air
compressor. Tests, inspections, and corrective actions should be performed in the order listed. If a malfunction beyond
the scope of direct support maintenance is discovered, refer the malfunction to general support maintenance.
NOTE
This table is not intended to cover every possible symptom, but is rather a list of
the more frequent problems and some of their causes.
SYMPTOM INDEX
Symptom
Page
1.Engine does not start ................................ ................................ ................................ ................................ ........ 5-2
2.Engine runs unevenly: low output ................................ ................................ ................................ ..................... 5-3
3.Engine races ................................ ................................ ................................ ................................ ................... 5-3
4.Engine exhaust emits excessive blue smoke................................ ................................ ................................ .... 5-3
5.Engine runs hot ................................ ................................ ................................ ................................ ................ 5-4
6.Excessive oil consumption ................................ ................................ ................................ ................................ 5-4
7.Unusual engine knocks and noises ................................ ................................ ................................ ................... 5-4
8.Compressor noisy ................................ ................................ ................................ ................................ ............ 5-4
9.Compressor pressure low ................................ ................................ ................................ ................................ . 5-5
10.
Compressor output volume low ................................ ................................ ................................ .. 5-5
Table 5-1. Direct Support Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE DOES NOT START.
Step 1. Test for low compression.
Proceed to step 2 if compression is low.
Step 2. Inspect valves condition.
Replace worn valves (para. 5-29).
Step 3. Inspect head gasket for ruptured (blown) condition.
Replace blown gasket (para. 5-29).
Step 4. Test for faulty fuel injector and feed rate of pump.
Replace faulty fuel injector (para. 5-27).
5-2
