23. EXCESSIVE VIBRATION

/.25ton/TM-9-2320-289-20 CUCV Series Trucks at Unit level Manual
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TM 9-2320-289-20 Table 2-3. Mechanical Troubleshooting (Con’t) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION WARNING Before checking for improper positioning and damage, allow exhaust system to cool. Failure to follow this warning will result in serious burns. Step 3. Check tailpipe, muffler, and exhaust pipe for improper positioning and damage. Reposition and tighten mounting hardware. Replace any damaged components. (See paragraph 3-27) Step 4. Check. engine mounts and insulators for looseness and damage. Tighten bolts securing mount to frame or engine if loose. If there is any damage, notify your supervisor. Step 5. Check alternator belts for improper tension or damage. Adjust or replace if damaged. (See paragraph 4-2 or 4-3) Step 6. Check for contaminated fuel by draining fuel container. Check color of fuel to determine Drain fuel and replace if contaminated from fuel filter draincock into suitable if the correct fuel is in fuel system. or incorrect fuel is in fuel system. WARNING Diesel fuel is flammable. When disconnecting fuel lines to test fuel flow, direct fuel spray away from source of ignition. A fire extinguisher must be on hand in work area. Failure to follow this warning may result in serious injury or death to personnel. Step 7. Check fuel pump operation. Disconnect input fuel line at the fuel filter. Disconnect pink lead from fuel injector pump. Use a quart capacity container and crank engine for 15 seconds. Container should be at least ¼ full or contain ½ pt (0.23 I) of fuel. Install low pressure gage in fuel line. Crank engine for 15 more seconds. Fuel pressure should be 5.5-6.5 psi (38-45 kPa). Connect fuel inlet line to fuel filter and connect pink lead to fuel injector pump. If fuel flow is insufficient, replace fuel pump. (See paragraph 3-10) 23. EXCESSIVE VIBRATION Step 1. Check engine mounts, insulators, and components for looseness and damage. Tighten any loose components. Tighten bolts securing mounts to frame or engine if loose. If there is any damage, notify your supervisor. 2-43

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