TM 5-4310-393-14Oil pressure regulator.Test and service as required.Table 4-2. Direct Support Troubleshooting Procedures (Continued)MALFUNCTION/SYMPTOMPROBABLE CAUSETEST OR INSPECTION/CORRECTIVE ACTION9. SAFETY VALVES BETWEEN STAGES RELEASING PRESSURE.Next stage inlet/discharge valves.Repair/replace as needed.Stage safety valve bad.Replace safety valve.10. ENGINE WILL NOT START.No fuel.Check fuel supply and fuel lines. Correct as required.Injector.Check, repair or replace as needed.Inadequate cranking speed.Too high a starting load.Unload the compressor by opening drain/bleed valves.Oil viscosity too high.Change oil to suit.11. ENGINE GIVES POOR PERFORMANCE.Fuel system.Clean fuel system.Exhaust back pressure.Clean/Replace muffler or spark arrester if required.12. ENGINE BACKFIRES.Fuel delivery.Adjust timing as needed.4-8
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