Engine Noise Excessive - Piston*
Cause Corrections
----------
Carbon Deposits on the Top of the
Piston Contacting the Cylinder Head
OK
f
Remove the cylinder head and pistons and
carbon from the pistons. Refer to Procedure
7-25. Inspect the piston rings for damage or
wear. Refer to Procedure 7-25.
----------
** Piston Pin or Bushing Loose, Worn,
or Not Installed Correctly
OK
f
Remove pistons and inspect the piston pin
and bushing for damage, wear, and
correct installation. Refer to Procedure
7-25.
----------
Piston Cracked or Broken
OK
f
Remove and inspect pistons for cracks
or damage. Refer to Procedure 7-25.
----------
Connecting Rod(s) Bent or
Out-Of-Alignment
OK
f
Remove the connecting rod(s). Refer to
Procedure 7-26. Refer to the N14 Engine
Shop Manual, Bulletin No. 3810487.
----------
Cylinder Liners Worn or Out-Of-Round
Remove pistons. Refer to Procedure 7-25.
Inspect the cylinder liners. Refer to
Procedure 7-27.
* Refer to Engine Noise Diagnostic Procedures on General Information at the end of this section before using this
Symptom Chart.
** Incorrect fit of the piston pin. Listen for a light ticking or tapping noise which is more noticeable with no load
on the engine. The noise can disappear completely when the engine is pulling a load. Piston pin noise can normally
be noticed during deceleration of the engine.
Troubleshooting Symptoms Charts SectionT-Troubleshooting
N14Page T-42
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