ARMY TM 9-6115-639-13 AIR FORCE TO 35C2-3-386-51 MARINE CORPS TM 10155A-13/1 Table 4-2.  Unit Level Preventive Maintenance Checks and Services for MEP 831A / 832A (continued) Item No. Interval Location: Item to Check/ Service Procedure Not Fully Mission Capable If: 6 500 hours Power Inverter/ Converter (A8) a.    Check area around Power Inverter/        Converter for water. Test gaskets for          water sealage  (see para. 4-46A). b.    Refer to para. 4-46 to replace gaskets. Gaskets are loose or not sealing properly. 7 500 hours Engine air filter Remove and replace engine air filter (Para. 3-9). Engine air filter has not been replaced. 8 500 hours Engine fuel injection pump a.    Inspect fuel injection pump for damage       and evidence of leakage.  Check area       around pump sealing gasket for leaks. b.    Refer to TM 9-2815-257-24 for pump and       gasket replacement. Fuel injection pump is damaged or leaking. Pump sealing gasket leaking. 9 500 hours Engine valves Adjust engine valve clearance in accordance with TM 9-2815-257-24. Engine valves are not properly adjusted, causing improper engine operation. 10 1000 hours Engine fuel injector nozzle Remove and replace fuel injector nozzle in accordance with TM 9-2815-257-24. Fuel injector nozzle has not been replaced. 4-11 Change 1