8. Fuel system
134
5. Excessive engine smoke
and knocking
•
Defective injection timing
•
Too low nozzle injection pressure
•
Broken nozzle spring
•
Nozzle not working properly
•
Excessively work plunger
•
Defective delivery valve seat
•
Excessive fuel supply
•
Adjust
•
Adjust
•
Replace it
•
Replace it
•
Adjust
•
Replace it
•
Check feed pump
6. Unstable engine power
•
Insufficient fuel supply
•
Air entered into fuel
•
Water entered into fuel
•
Defective plunger operation
•
Defective actuator operation
•
Defective nozzle
•
Injection start pressure different between cylinders
•
Defective controller
•
Check feed pump
•
Air bleeding
•
Replace fuel
•
Disassemble / correct
•
Disassemble / correct
•
Disassemble / correct
•
Adjust
•
Adjust
7. Engine cannot reach the
max. speed
•
Nozzle not working properly
•
Defective operation of actuator or controller
•
Disassemble / correct
•
Adjust
8. Unstable engine idling
•
Defective controller operation
•
Defective plunger operation
•
Defective magnetic pickup sensor
•
Adjust
•
Disassemble / correct
•
Inspect or replace
Symptom
Causes
Troubleshooting