CUMMINS N14 - Engine Power Output Low - Performance Measurement

Engine Power Output Low - Performance Measurement
NOTE: After conducting the performance test, use this chart to analyze the performance data.
Cause Corrections
----------
Intake Air Restriction Excessive
OK
f
Clean/replace air filter element or
damaged air intake piping.
----------
Fuel Inlet (Suction Line) Restriction
Excessive
OK
f
Check fuel plumbing. Replace as necessary.
For PT engines, refer to Procedure 5-01. For
CELECT™ engines, refer to the N14
CELECT™ System Troubleshooting and
Repair Manual, Bulletin No. 3810469.
----------
Fuel Supply (Pump Out Line) Restric-
tion Excessive
OK
f
Inspect fuel plumbing to injectors. If appli-
cable, check fuel pressure before and after
auxiliary fuel control devices installed
between fuel pump and injectors. For PT
engines, refer to Procedure 5-01. For
CELECT™ engines, refer to the N14
CELECT™ System Troubleshooting and
Repair Manual, Bulletin No. 3810469.
----------
Fuel Drain Line Restricted (AFC Single
Spring Non-Class Fit Fuel Pump Only)
OK
f
Inspect fuel return system for loops, swelled
lines, or clamped points. Replace/reroute
fuel lines. Verify fuel tank vents are not
blocked, plugged, or corroded.
----------
AFC ‘‘No-Air’’ Screw Adjustment/Dual
Spring AFC Plunger Position Incorrect
OK
f
Check/adjust the AFC ‘‘no-air’’ setting.
Refer to Procedure 5-20.
----------
VS Governor Adjustment Incorrect
OK
f
Check/adjust VS governor. Refer to
Procedure 5-05.
----------
Fuel Rate Low, Fuel Pressure High,
Intake Manifold Pressure OK or Low
OK
f
Clean/flush injectors. Replace if necessary.
On STC, refer to Procedure 5-10. Check for
injector carboning. Check for fuel rail line
restriction, plugged injector screens, and/or
tight injector setting.
(Continued)
SectionT-Troubleshooting Troubleshooting Symptoms Charts
N14 Page T-51