Quantcast EXCESSIVE BLACK SMOKE AT IDLE.

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TM 9-2815-226-34-1
Table 2-1. TROUBLESHOOTING PROCEDURES (Cont)
MALFUNCTION
TEST OR INSPECTIO N
CORRECTIVE ACTION
6.
EXCESSIVE BLACK SMOKE AT IDLE.
Step 1. Check for restricted fuel lines.
Remove and purge fuel lines (TM 9-2320-281-20).
Step 2. Check for blown or leaking head gasket(s).
a.
Retorque head bolts (table 3-3).
b.
Replace defective head gasket(s) (para 3-6 and 3-94).
Step 3. Check for plugged injector spray holes.
Clean injector (para 3-73).
Step 4. Check for cracked injector body or cup.
Replace defective injector (para 3-6 and 3-94).
Step 5. Check for improper injector flow adjustments.
Test and adjust injectors (para 3-75).
Step 6. Check for worn or scored governor plunger.
Replace defective plunger (para 3-82).
Step 7. Check for improper weight assist setting.
Set weight assist (para 3-82).
Step 8. Check for worn or scored cylinder liners or pistons.
Replace defective cylinder liners or pistons (para 3-6 and 3-94).
Step 9. Check for broken or worn piston rings.
Replace defective rings (para 3-20).
2-7


 


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