Direct Support Mechanical Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 6. ENGINE DELIVERS EXCESSIVE BLACK SMOKE Perform malfunction 19. END OF TESTING! 7. ENGINE SURGES OR MISFIRES DURING OPERATION Step 1. Perform malfunction 3. Step 2. If malfunction continues, replace engine (WP 0295 00). END OF TESTING! 8. ENGINE STOPS DURING NORMAL OPERATION Step 1. Start engine (TM 9-2320-386-10) and check operation. If engine runs rough, misfires, or does not start, perform malfunction 2. Step 2. Perform malfunction 1, steps 1 through 3. Step 3. Perform malfunction 3. END OF TESTING! 9. EXHAUST COLOR BLUE DURING NORMAL OPERATION NOTE Blue exhaust indicates presence of excessive engine oil in cylinder combustion chamber. Step 1. Check for failure of turbocharger oil seal. Remove charged-air cooler tubes (WP 0073 00) and check for presence of oil. If oil is present, replace turbocharger (WP 0325 00). Step 2. Check intake and exhaust valve adjustment (WP 0311 00). Step 3. Perform malfunction 3, step 5. END OF TESTING! 10. EXHAUST COLOR WHITE DURING NORMAL OPERATION CAUTION Thick white exhaust indicates coolant is present in engine combustion chambers during operation. When this condition is evident, shut down engine immediately and determine cause. Continued engine operation may result in permanent engine damage. Step 1. Perform cooling system pressure test (TM 750-254). a. If test does not indicate a leak in cooling system, perform malfunction 2. b. If test indicates a leak is present in cooling system, perform step 2. Step 2. Replace fuel injectors (WP 0319 00). If condition continues, perform step 3. Step 3. Check engine oil for presence of coolant. a. If coolant is present, remove cylinder head (WP 0302 00). Inspect cylinder head, head gasket, and engine block for cracks. Replace cylinder head if cracked (WP 0302 00). Replace engine if engine block is cracked (WP 0295 00). TM 9-2320-386-24-1-2 0293 00 0293 00-3