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TM-9-2320-361-24-1 Page 140

TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks

Page 140 of 1176


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TM 9-2320-361-24-1 0008 00 0008 00-12 MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 16. ENGINE NOISE ABNORMAL NOTE When abnormal engine noise is evident, engine should be checked and location of noise determined to ensure engine will not be permanently damaged. 1. When a knocking noise is located at front of engine, check camshaft gear, crankshaft gear, or fuel injection pump gear for damage, excessive backlash, or loose fit. Check excessive camshaft end play. Remove timing gear cover (WP 0032 00). 2. When a knocking noise is located at top of engine, remove rocker arm covers (WP 0030 00) and check valve train components mounted on cylinder heads for wear, defects, or incorrect adjustment (WP 0031 00). 3. When knocking noise is located at side of engine, remove side tappet chamber covers, valve covers, valve train components and tappets. Check for defects. 4. When a knocking noise is located at bottom or rear of engine, check flywheel screws for loose conditions. Position in neutral, start engine, and press and release clutch a number of times. 5. When a knocking noise is located at bottom of engine, remove oil pan, (WP 0035 00) and check condition of bearings, crankshaft and rods for wear and defects. 6. Disassemble engine and check connecting rod wrist pins and pistons for wear and defects. 1. If gears are loose on shafts, tighten or replace gears (TM 9-2815-210-34-2-1). 2. If gears are worn, defective, or have excessive backlash, replace engine (WP 0046 00). 3. If camshaft end play is excessive, replace engine (WP 0046 00). 1. If valve train components are worn or are defective, replace (WP 0031 00, and WP 0034 00). 2. If valve train components are out of adjustment, adjust (WP 0031 00). If valve train components are excessively worn or defective, replace (WP 0031 00, and WP 0034 00). If noise changes, remove transmission (WP 0131 00) and clutch (WP 0050 00) and check flywheel screws for loose condition. Tighten loose screws or replace damaged or defective flywheel components (WP 0029 00). 1. If bearings are worn or defective, replace engine (WP 0046 00). 2. If crankshaft or connecting rods are defective or damaged, replace engine (WP 0046 00). 3. If worn or defective, replace engine (WP 0046 00). Table 1. Engine Troubleshooting Procedures (Contd).