TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0008 00 0008 00-8 MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 11. EXHAUST COLOR BLUE DURING NORMAL OPERATION (Contd) 4. Check valve seats, valve guides, or cylinder head gaskets for defects. Remove cylinder heads (WP 0027 00) and disassemble (WP 0438 00). 5. Repeat steps 1 and 2 of enigine oil consumption test. If valve seats, valve guides or cylinder heads are defective, replace (WP 0443 00 or WP 0027 00). If oil consumption remains more than one quart for every 60 mi (96 km), piston rings or cylinders bores may be worn or defective. Replace defective components. Perform compression test. If the wet compression test raises compression readings more than 50 psi (345 kPa), a piston ring or cylinder bore problem is indicated. Replace engine (WP 0046 00). 12. 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 operation may result in permanent engine damage. 1. Check engine temperature. Ensure engine temperature is within operating temperature (TM 9-2320-361-10). WARNING Hot coolant is under pressure. Care should be used when removing coolant filler cap or inspecting hot engine coolant leaks. Steam or hot coolant under pressure may cause severe injury to personnel. 2. Pressure test warm engine cooling system (TM 750-254). Observe pressure tester reading. 1. If pressure test reading declines and there is no indication of external leaks, coolant is leaking internally into engine or combustion chambers. Remove oil dipstick and check engine oil for presence of coolant. Table 1. Engine Troubleshooting Procedures (Contd).