ARMY TM 9-6115-604-12NAVY NAVFAC P-8-633-12Table 4-3. Unit Troubleshooting (Continued)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION14. OIL DILUTION (CRANKCASE).Step 1. Check for proper coolant level and evidence of leaks.Repair as necessary.Step 2. Check for low coolant temperature during operation If low, check thermostats for proper operation.Replace defective thermostats.15. LOW OIL PRESSURE.Step 1. Check crankcase oil level. If low or empty, Inspect for leaks.Repair leaks. Add oil to crankcase.Step 2. Check all lines, connections, and gaskets for external oil leaksRepair as necessary.Step 3. Check oil grade.Use proper grade for weather conditions.Step 4. Check for by-pass filter restriction. Check size of orificeReplace filter.Change orifice if incorrect.Step 5. Check for defective gages and sender.Replace if defective.16. COOLANT TEMPERATURE TOO LOW.Step 1. Check louvers for proper adjustment.Close louvers to adjust for cool ambient air.Step 2. Test engine coolant thermostat for proper operation. Refer to paragraph 4-59.Replace if defective or of improper heat range.Step 3 Check for defective gage and sender.Replace If defective.17. COOLANT TEMPERATURE TOO HIGH.Step 1. Check coolant level. Check radiatorFill to proper level. Clean radiator Flush coolant system Replace coolantStep 2. Test engine coolant thermostat. Refer to paragraph 4-59.Replace If defective.Step 3. Check water pump operation.Replace If defective4-29
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