Table 4-1. Engine and Engine Systems Troubleshooting (Continued).
TEST OR INSPECTION.
14. LOW OIL PRESSURE:
Check oil level.
Fill to proper level (Refer to Lubrication Order LO 9-2320-273-12).
Replace filter (para 4-14).
Check for defective oil pressure gage.
Test pressure with a gage that is known to be good (para 5-59). If test gage
indicates correct pressure, replace gage. If low or no pressure is indicated,
notify Direct Support Maintenance.
15. NO CAB HEAT:
Check for closed heater water control valve.
Open valve (para 4-50).
Check for air in heater.
Bleed air from heater (para 4-50).
Check for low coolant level.
Fill to proper level and check for leaks (para 4-42).
Check thermostat and thermal control (engine running cold).
Replace thermostat (para 4-43).
16. EXCESSIVE EXHAUST NOISE:
Check for defective exhaust pipe or gasket(s).
Replace defective item (para 4-34 thru 4-38, as applicable).
Check for defective muffler.
Replace muffler (para 4-37).
17. EXHAUST FUMES IN CAB:
Check for loose or defective manifold or leaks in pipes.
Replace pipe (para 4-34 thru 4-38, as applicable) or refer to Direct Support
Maintenance if manifold is defective.
18. ENGINE OVERHEATS:
Check coolant level.
Add coolant until sight glass is full.