EXCESSIVE EXHAUST SMOKE (BLACK SMOKE) AFTER ENGINE WARMUP.

TM 9-2350-238-20-1

2-11. TROUBLESHOOTING INFORMATION (CONT).

Table 2-3. UNIT TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE OVERHEATS (CONT).

Remove, inspect, and test thermostats. Refer to page 2-534.

Step 7.

Replace thermostats as required. Refer to page 2-534.

Check exterior of radiators for damage.

Step 8.

Replace radiators as required. Refer to page 2-515.

Flush cooling system. Refer to TM 750-254. Check for faulty engine coolant

Step 9.

temperature indicator and transmitter.

Troubleshoot engine coolant temperature indicator circuit. Refer to

Electrical Circuit Symptom Index, page 2-92.

If problem still exists, notify direct support maintenance.

Step 10.

EXCESSIVE EXHAUST SMOKE (BLACK SMOKE) AFTER ENGINE WARMUP.

Check for stuck or damaged exhaust valves.

Step 1.

Replace stuck or damaged exhaust valves. Refer to page 2-514.

Step 2.

Check for plugged engine intake air duct.

Clean, repair, or replace as required. Refer to page 2-457.

Step 3.

Check for plugged or damaged intake air separators.

Clean, repair, or replace as required. Refer to page 2-446.

Step 4.

Check for plugged turbocharger air intake duct and screen.

Clean, repair, or replace as required. Refer to page 2-459 or

Step 5.

Check for damaged intake air cleaner and filter element.

If damaged, repair as required. Refer to page 2-446.

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