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 00-4 MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 3. ENGINE CRANKS BUT WILL NOT START (Contd) 2. If wet compression readings increase 50 psi (345 kPa) or more, piston rings or cylinder bores may be worn. Replace engine (WP 0046 00). 4. ENGINE STARTS BUT STOPS WHEN ACCELERATOR IS OPERATED 1. Check fuel leakage at inlet side of fuel supply pump (mounted on fuel injection pump). 2. Check fuel delivery system for defective components. Refer to WP 0008 00, table 2, malfunction 1, step 4. Replace defective components. Refer to WP 0008 00, table 2, malfunction 1. Replace defective components. 5. ENGINE STOPS WHEN ACCELERATOR IS RETURNED TO IDLE POSITION Check fuel delivery system. Refer to WP 0008 00, table 2, malfunction 1. Replace defective components. 6. POOR ACCELERATION AND/OR LACK OF POWER 1. Check vehicle clutch system for slippage. 2. Check fuel delivery system for defective parts. 3. Check fuel injection pump timing is set within specifications (WP 0069 00). 4. Check turbocharger operation. Remove plug from top of inlet manifold. Install low pressure gauge with adapter into plug opening. Start engine and accelerate engine to full throttle and immediately decelerate. Observe pressure gauge readings. 5. Check turbocharger outlet, hose, intake manifold elbow and gasket for leaks (WP 0057 00). Refer to WP 0008 00, table 4, malfunction 2. Replace defective components. Refer to WP 0008 00, table 2, malfunction 1, steps 1–5. Replace defective parts. If fuel injection pump timing is incorrect, adjust (WP 0069 00). If no gauge movement or only a small pressure increase by gauge is evident, replace turbocharger (WP 0057 00). 1. Tighten base screw and clamps. Replace missing components. 2. If no improvement during test run, remove and inspect turbocharger hose, intake manifold elbow, and gaskets for defects. Replace defective components (WP 0057 00). Table 1. Engine Troubleshooting Procedures (Contd).