EXCESSIVE BLACK SMOKE AT IDLE.

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TM-9-2815-226-34-1 Engine Diesel 6 Cylinder Inline Turbocharged Cummins NTC-400 BC2 Manual

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EXCESSIVE WHITE SMOKE AT IDLE.

TM 9-2815-226-34-1

Table 2-1. TROUBLESHOOTING PROCEDURES (Cont)

MALFUNCTION

TEST OR INSPECTIO N

CORRECTIVE ACTION

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).

Retorque head bolts (table 3-3).

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).

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