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TM 10-4320-348-14
SECTION I. DIRECT SUPPORT TROUBLESHOOTING
5.1 SCOPE. This level of troubleshooting contains checks and corrective maintenance actions which will isolate defects
to be corrected by specific maintenance procedures. Table 5-1 is a direct support troubleshooting chart. Symptoms listed
in this table are accompanied by suggested tests or inspections which, in turn, suggest corrective action and the
appropriate maintenance paragraph reference. Corrective action sometimes suggests additional checks to confirm the
troubled area or further localize and isolate trouble to a more specific component. Maintenance procedures include
removal, cleaning, inspection, repair, replacement, and assembly. These maintenance procedures can be found in
Section IV of this chapter.
5.2 DIRECT SUPPORT TROUBLESHOOTING TABLE. The following paragraphs briefly explain the different column
headings of Table 5-1.
a.Column 1 Malfunction Number. This column of the table is a sequential listing of problematic symptoms. The
malfunction number is used for cross reference purposes and to avoid needless repetition.
b.Column 2 Test or Inspection. This column of the table suggests further test or inspection checks to localize the
symptom cause to a more specific area. It allows corrective action flexibility depending on the outcome of
these checks.
c.Column 3 Corrective Action. This column of the table lists the corrective action to be taken and the paragraph
reference to locate the step-by-step maintenance procedures to fix the fault.
5.3 MALFUNCTION INDEX.
Malfunction
Page No.
1. Engine Will Not Start ....................................................................................................................5-2
2. Black Smoke Exhaust.. ................................................................................................................5-3
3. Drop In Engine Rotation Speed....................................................................................................5-3
4. Bluish-White Exhaust Smoke .......................................................................................................5-3
5. Pump Does Not Pump..................................................................................................................5-3
Table 5-1. Direct Support Troubleshooting Table
Malfunction
Test or Inspection
Corrective Action
1. ENGINE WILL NOT START
Step 1. Check fuel injection nozzle.Check that diesel fuel reaches the fuel injection nozzle.
Replace fuel injection nozzle. (Refer to para 5.8)
Step 2. Check fuel injection pump.Check that diesel fuel reaches the fuel injection pump.
Adjust/replace fuel injection pump. (Refer to para 5.9)
5-2
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