Engine Noise Excessive - Main Bearing*
Cause Corrections
----------
Main Bearing Capscrews Loose, Worn,
or Not Tightened Correctly
OK
f
Inspect main bearing caps and
capscrews. Refer to Procedure 7-23.
----------
Main Bearings Damaged, Worn or
Wrong Bearings Installed
OK
f
Inspect main bearings. Refer to Procedure
7-23. Inspect the crankshaft journals. Refer
to the N14 Engine Shop Manual, Bulletin No.
3810487.
----------
Crankshaft Journals Damaged or
Out-Of-Round
Inspect the crankshaft journals. Refer to
the N14 Engine Shop Manual, Bulletin No.
3810487.
* Refer to Engine Noise Diagnostic on General Information symptom chart before using this Symptom Chart.
SectionT-Troubleshooting Troubleshooting Symptoms Charts
N14 Page T-41
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