TM 9-2320-289-20Table 2-3. Mechanical Troubleshooting (Con’t)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONWARNINGDiesel fuel is flammable. When disconnecting fuel lines to test fuel flow,direct fuel spray away from source of ignition. A fire extinguisher must beon hand in work area. Failure to follow this warning may result in seriousinjury or death to personnel.Step 6.Check fuel pump operation. Disconnect input fuel line at the fuel filter. Disconnectpink lead from fuel injector pump. Use a quart capacity container and crank enginefor 15 seconds. Container should be at least ¼ full or contain ½ pt (0.23 1) of fuel,Install low pressure gage in fuel line. Crank engine for 15 more seconds. Fuelpressure should be 5.5-6.5 psi (38-45 kPa). Connect fuel inlet line to fuel filter andconnect pink lead to fuel injector pump.If fuel flow is insufficient, replace fuel pump. (See paragraph 3-10)21. STARTS, IDLES ROUGH WHEN HOTWARNINGDiesel fuel is flammable. When disconnecting fuel lines to test fuel flow,direct fuel spray away from source of ignition. A fire extinguisher must beon hand in work area. Failure to follow this warning may result in seriousinjury or death to personnel.Step 1.Check for leaking or restricted fuel lines.Tighten fittings or replace leaking or restricted lines as required, (Seeparagraph 3-13 or 3-14)lf no leaks or crimps are obvious, bleed fuel filter. (See paragraph 3-17)Step 2.Check for contaminated fuel by draining fuel from fuel filter draincock into suitablecontainer. Check color of fuel to determine if the correct fuel is in fuel system.Drain fuel and replace if contaminated or incorrect fuel is in fuel system.22. KNOCKS AT IDLE WHEN HOTStep 1.Check oil level indicator for proper reading. (See TM 9-2320-289-10)Step 2.With engine cool, check level of coolant. (See TM 9-2320-289-10)2-42Change 2
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