TM 9-2320-289-20Table 2-3. Mechanical Troubleshooting (Con’t)MALFUNCTIONTEST OR INSPECTIONC0RRECTIVE ACTION24. EXCESSIVE OIL LOSSStep 1.Step 2.Step 3.Step 4.Check oil level indicator for proper reading. (See TM 9-2320-289-10)Inspect oil filler cap vent for buildup of sand, dirt, and other foreign material that maykeep oil filler cap vent valve in an open position. If condition exists, remove oil fillercap, clean, and shake to listen for rattling sound.If cap rattles, install.If cap does not rattle, replace.Remove crankcase depression regulator valve (CDRV) assembly and CDRV hoses.Clean with a rag and inspect for cracks. Test CDRV for proper operation.Clear foreign material and test or replace if necessary.Clean excess oil from exterior of valve cover, oil level indicator tube, oil pan andplug, oil filter, fuel pump, engine oil cooler lines, and oil pressure sending unit;check for looseness, damage, and leakage.If leakage is evident, notify your supervisor.25. OIL PRESSURE LIGHT ON AT IDLEStep 1.Check oil level indicator for proper reading. (See TM 9-2320-289-10)Step 2.Check engine idle speed. (See paragraph 3-25)Step 3.Check oil pressure sending unit for looseness, damage, or leakage.Repair as necessary.Step 4.If light remains on, replace oil pressure sending unit. (See paragraph 4-14)26. COOLANT LOSSStep 1.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 3-32, 3-33, and 3-34)Step 2.Check radiator cap for proper relief pressure. (See TM 750-254) Relief pressureshould be 15 psi (103 kPa).Replace if defective.2-44Change 2
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