TM 9-4940-568-34
2-7
Table 2-3. Engine Troubleshooting (CONT).
Malfunction
Test or Inspection
Corrective Action
10. ENGINE WILL NOT SHUT OFF.
Fuel injection pump malfunctioning.
Remove the fuel injection pump. Check and repair the fuel injection pump (Para 5-17).
11. ENGINE VIBRATION EXCESSIVE.
Flywheel housing is misaligned.
Check and correct flywheel alignment (Para 5-11).
Power components loose or broken.
Inspect the camshaft (Para 7-7) and rods (TM 9-4940-568-20) for damage that cause an
unbalance.
12. ENGINE NOISES EXCESSIVE.
Valve lash is excessive.
Adjust valves. Make sure the push rods are not bent or the rocker levers are not severely
worn (TM 9-4940-568-20).
Power function knock.
Check and replace rod and main bearings (Para 7-5).
13. ENGINE HARD TO START OR WILL NOT START - SMOKE FROM EXHAUST.
Fuel injection pump out of time.
Check top dead center (TDC) (Para 7-9).
Check and adjust fuel injection pump timing (Para 5-19).
Valves are incorrectly adjusted.
Adjust valves (TM 9-4940-568-20).
One or more injectors are worn or malfunctioning.
Check and replace injectors (TM 9-4940-568-20).
Engine compression is low.
Perform a compression check to identify the problem (Para 5-8).
Fuel injection pump is malfunctioning and delivery valves are malfunctioning.
Replace fuel injection pump (Para 5-17).
