Table 2-3. Mechanical TroubleshootingTM 9-2320-289-20(con’t)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION27. OVERHEATSStep 1.Check for loose, damaged, or missing fan belts.Adjust or replace if damaged. (See paragraph 4-2 or 4-3)Step 2.Pressurize cooling system and check for leakage on all hoses and components.(See TM 750-254)Tighten loose clamps, fasteners, or fittings. Replace leaking hoses andcomponents. (See paragraphs 3-6, 3-32, 3-33, and 3-34)Step 3.If engine continues to overheat, replace thermostat. (See paragraph 3-34)Step 4.Check fan clutch.Replace fan clutch. (See paragraph 3-35)28. NOTICEABLE LOSS OF POWERStep 1.Inspect air cleaner filter and polywrap.Replace air cleaner filter if required. Clean polywrap if required. (Seeparagraph 3-9).WARNINGDiesel 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 2.Check for restricted fuel filter. Bleed air from fuel system. (See paragraph 3-17)If fuel flow is insufficient, replace fuel filter. (See paragraph 3-17)Step 3.Check for leaking or restricted fuel lines.Tighten fittings or replace leaking or restricted lines. (See paragraph 3-13 or3-14)WARNINGBefore checking for improper positioning and damage, allow exhaustsystem to cool. Failure to follow this warning will result in serious burns.Step 4.Check tailpipe, muffler, and exhaust pipe for improper positioning and damage.Reposition and tighten mounting hardware.Replace any damaged components. (See paragraph 3-27)Change 22-45
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