18. WHITE SMOKE (AIR TEMPERATURE WARM)

21. IDLES ROUGH WITHOUT ABNORMAL NOISE OR SMOKE, WILL NOT CLEAR UP

/.25ton/TM-9-2320-289-34 CUCV Series Trucks at intermediate direct support and general support level Manual
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Table 2-1. Mechanical Troubleshooting (Con’t) TM 9-2320-289-34 MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 18. WHITE SMOKE (AIR TEMPERATURE WARM) NOTE Perform step 1 if white smokes only appears during starting. Step 1. Check for inoperative glow plug module. (See TM 9-2320-289-20) Step 2. Check fuel injector pump timing, (See paragraph 3-44) WARNING Use extreme caution to ensure that clothing or tools DO NOT get caught in truck’s operating drivebelts. Failure to follow this warning may result in serious injury to personnel or equipment damage. Step 3. Start engine, Depress bottom of rocker lever on right side of fuel injector pump, If engine sound doesn’t change, remove and inspect fuel injector pump servo advance piston assembly. (See paragraph 3-40) Step 4. Test compression of each cylinder. (See paragraph 3-2) Step 5. Check timing chain free play. (See paragraph 3-1 1) 19. EXCESSIVE BLACK SMOKE Step 1. Check fuel injector pump timing. (See paragraph 3-44) Step 2. Test each fuel injector nozzle. (See paragraph 3-36) Step 3. Test compression of each cylinder. (See paragraph 3-2) 20. IDLES ROUGH ON COLD-STARTS BUT CLEARS UP AFTER WARM-UP Step 1. Check fuel injector pump timing. (See paragraph 3-44) Step 2. Test fuel injector pump, (See paragraph 3-44) 2-17

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