Engine Noise Excessive*
Cause Corrections
----------
Oil Supply Insufficient or Oil Pressure
Low
OK
f
Check oil level. Refer to Procedure 2-07.
Refer to ‘‘Lubricating Oil Pressure Low’’
Symptom Chart.
----------
Lubricating Oil Thin or Diluted
OK
f
Refer to Oil Specifications in the N14
Operation and Maintenance Manual, Bulletin
No. 3666024. Refer to coolant and fuel in the
‘‘Lubricating Oil Contaminated’’ Symptom
Chart.
----------
Fan Belt Malfunctioning (Too Tight,
Loose, or Not in Alignment)
OK
f
Check fan belt. Refer to Procedure 1-21.
----------
Fan Blades Damaged or Contacting
Shroud or Radiator Core
OK
f
Check fan. Refer to Procedure 1-18.
----------
Engine Mounts Damaged
OK
f
Check engine mounts. Refer to Proce-
dure 9-02.
----------
Intake or Exhaust Piping Contacting
Chassis or Cab
OK
f
Inspect systems for contact points.
----------
Intake Air or Exhaust Gas Leak
OK
f
Check for leak. Refer to Procedure 3-01.
----------
Turbocharger Noise
OK
f
Refer to ‘‘Engine Noise Excessive -
Turbocharger’’ Symptom Chart.
(Continued)
* Note: When troubleshooting engine noise problems, make sure the engine accessories (air compressor, fan
clutch, freon compressor or hydraulic pump) are not the cause of the noise. Refer to Engine Noise Diagnostic
Procedures - General Information symptom chart before using this chart.
Troubleshooting Symptoms Charts SectionT-Troubleshooting
N14Page T-36
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