TM 9-4940-568-34
2-6
Table 2-3. Engine Troubleshooting (CONT).
Malfunction
Test or Inspection
Corrective Action
6. LUBRICATING OIL CONTAMINATED.
Fuel injection pump seal leaking (rotary).
Remove and repair the fuel injection pump (Para 5-17).
Internal plunger seal leaking (in-line).
Remove and repair the fuel injection pump (Para 5-17).
Injector needle valves not sealing.
Locate and replace malfunctioning injector (TM 9-4940-568-20).
7. FUEL OR OIL LEAKING FROM EXHAUST MANIFOLD.
Injector needle valve is stuck open.
Locate and replace malfunctioning injector (TM 9-4940-568-20).
Blowby is excessive.
Check for excessive blowby (TM 9-4940-568-20).
Fuel injection pump timing is incorrect.
Check and time the injection pump (Para 5-19).
8. COMPRESSION KNOCKS.
Fuel injection pump timing is incorrect.
Check and time fuel injection pump (Para 5-19).
Injectors are malfunctioning.
Replace injectors (TM 9-4940-568-20).
Coolant operating temperature is incorrect.
Refer to troubleshooting logic for Low Coolant Temperature (TM 9-4940-568-20).
9. FUEL CONSUMPTION EXCESSIVE.
Injectors worn or malfunctioning.
Check and replace injectors (TM 9-4940-568-20).
