TM 9-4940-568-34
2-5
Table 2-3. Engine Troubleshooting
Malfunction
Test or Inspection
Corrective Action
1. ENGINE CRANKS BUT WILL NOT START - NO SMOKE FROM EXHAUST.
Worn or malfunctioning fuel injection pump.
Visually check fuel delivery with an externally connected injector to one of the pump
outlets. Replace fuel injection pump (Para 5-17).
Injection pump timing is incorrect.
Verify/time the pump (Para 5-19).
Engine camshaft is out of time.
Check and correct the gear train timing alignment (Para 7-7).
2. COOLANT LOSS.
Cylinder head gasket leaks.
Check and replace the head gasket (Para 5-7).
Cylinder head cracked or porous.
Check and replace the head (Para 5-7).
Cylinder block coolant passaged leaking.
Check and replace the cylinder block (Para 5-7).
3. LUBRICATING OIL PRESSURE LOW.
Pressure regulator valve is struck open.
Check and replace valve (TM 9-4940-568-20).
Cylinder block or cylinder head plugs loose or missing.
Check and replace expansion plugs (Para 7-3).
4. LUBRICATING OIL PRESSURE HIGH.
Pressure regulator valve stuck open.
Check and replace valve (TM 9-4940-568-20).
5. LUBRICATING OIL CONSUMPTION EXCESSIVE.
Valve seals worn.
Inspect and replace the valve seals (Para 7-4).
Piston rings not sealing and lubricating oil being consumed by the engine.
Perform a compression check (Para 5-8). Repair as required (Para 7-6).
