ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – Engine Noise Excessive — Piston

Symptom Tree  t051

This is symptom tree t051
Cause Correction

Refer to Engine Noise Diagnostic Procedures – General Information at the end of Section TS before using this symptom tree.

Electronic fault codes active or high counts of inactive fault codes

Read the fault codes with an electronic service tool. Refer to Section TF in Troubleshooting and Repair Manual, ISB, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL and QSL9 Engines, CM850 Electronic Control System, Bulletin 4021416 or Troubleshooting and Repair Manual, Electronic Control System, ISC, QSC8.3 and ISL Engines, Bulletin 3666271.


Fuel grade is not correct for the application or the fuel quality is poor

Operate the engine from a tank of high-quality fuel. Refer to the Fuels for Cummins Engines, Bulletin 3379001.


Overhead adjustments are not correct

Measure and adjust the overhead settings. Refer to Procedure 003-004.


Injector is malfunctioning

Perform the automated cylinder performance test. Replace injectors as necessary. Refer to Procedures 006-026 and 014-008.


Connecting rod is bent or out of alignment

Remove and inspect the connecting rods. Refer to Procedure 001-014.


Connecting rod is misassembled

Remove and inspect the connecting rod. Refer to Procedure 001-014.


Piston or piston rings are worn or damaged

Check for air intake system leaks. Check the pistons and piston rings for wear or damage. Refer to Procedure 001-043.


Piston is misassembled

Remove and inspect the piston. Refer to Procedure 001-043 or 001-054.


Piston pin or bushing is loose, worn, or not installed correctly

Remove the pistons and inspect the piston pin and bushing for damage, wear, and correct installation. Refer to Procedure 001-043 or 001-054.

Last Modified:  20-Jun-2005