TM 9-2320-361-20 Table 2-2. Mechanical Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 11. EXCESSIVE VIBRATION OR CLUNKING Check engine mounts and pads for looseness or damage. If engine mounts or pads are damaged, replace (paras. 3-2 and 3-3). END OF TESTING! 12. EXCESSIVE FUEL CONSUMPTION Step 1. Check for air cleaner restrictions (malfunction 2, step 2). Step 2. Inspect fuel lines, hoses, and connections for leaks and damage. a. Tighten any loose connections. b. If fuel lines, hoses, or connections are leaking or damaged, notify your supervisor. END OF TESTING! EXHAUST SYSTEM 13. EXHAUST COLOR BLUE DURING NORMAL OPERATION NOTE Blue exhaust indicates presence of excess engine oil in cylinder combustion space. Step 1. Check that engine oil grade is correct for vehicle use and climatic conditions (LO 9-2320- 209-12-1). If oil grade is incorrect, replace oil (LO 9-2320-209-12-1) and oil filters (para. 3-8). Step 2. Check that engine fuel grade is correct for vehicle use and climatic conditions (TM 9-2320- 361-10). a. If fuel grade is incorrect, drain complete fuel system and replace with correct grade of fuel (TM 9-2320-361-10). b. If problem persists, notify your supervisor. END OF TESTING! 14. EXHAUST COLOR WHITE DURING NORMAL OPERATION AND IDLE CAUTION Thick white smoke indicates coolant is present in engine combustion chambers during operation. When this condition is evident, shut engine down immediately and determine cause. Continued engine operations may result in permanent engine damage. Step 1. Check engine temperature. Ensure engine temperature is at specified level (TM 9-2320- 361-10). If engine temperature is above operating level, perform malfunction 18. Step 2. If problem persists, notify your supervisor. END OF TESTING! 2-32