TM 5-4310-393-14
Oil pressure regulator.
Test and service as required.
Table 4-2. Direct Support Troubleshooting Procedures (Continued)
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST OR INSPECTION/CORRECTIVE ACTION
9. 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
