CUMMINS N14 - Fuel Consumption Excessive - Performance Test Evaluation (Continued)

Fuel Consumption Excessive - Performance Test Evaluation (Continued)
Cause Corrections
----------
Fuel Rate Low, Fuel Pressure OK, Intake
Manifold Pressure High, Ambient Air
Temperature Between 0 and 38°C [32 and
100°F]
OK
f
Remove injectors and check for correct part
number for CPL. Refer to CPL Manual,
Bulletin No. 3379133. Check injector
calibration.
----------
Intake Manifold Pressure High, Fuel Rate
OK, Fuel Pressure OK, Ambient Air
Temperature Below 0°C [32°F]
OK
f
No corrections required. Normal operation
at ambient air temperatures below 0°C
[32°F]. Continue operation.
----------
Fuel Rate OK, Fuel Pressure OK,
Intake Manifold Pressure Low
OK
f
• Excessive intake air restriction. Refer to
Procedures 3-04 and 3-11.
• Excessive exhaust restriction. Check for
exhaust pipe damage or restriction. Check
for correct muffler part number.
• Check for intake air or exhaust leaks
between the turbocharger and the engine.
Refer to Procedures 3-01 and 3-11.
• Check turbocharger wheel clearance. Refer
to Procedure 3-07.
----------
Fuel Rate Low, Fuel Pressure Low,
Intake Manifold Pressure Low**
OK
f
Remove PT fuel pump and check calibration.
Refer to PT Fuel Pump Rebuild and Calibra-
tion Manual, Bulletin No. 3379084. Check
entire fuel pump calibration.
----------
Fuel Rate and Fuel Pressure High
OK
f
Check governor break calibration.
----------
Engine Brake or Exhaust Brake
Adjustment Incorrect
OK
f
Adjust engine brakes. Refer to Proce-
dure 7-05.
(Continued)
* This symptom causes low power which can lead to excessive fuel consumption.
Troubleshooting Symptoms Charts SectionT-Troubleshooting
N14Page T-78