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Cummins ISX11.9 CM2250 – Service Manual Engine Noise Excessive

Symptom Tree  t047

This is symptom tree t047
Cause Correction

When troubleshooting engine noise complaints, make sure the engine accessories (air compressor, fan clutch, refrigerant compressor, or hydraulic pump) are not the cause of the noise. Refer to Engine Noise Diagnostic Procedures – General Information at the end of Section TS before using this symptom tree.

Interview the operator to verify the complaint

Refer to Driveability-General Information, the Driveability/Low-Power Customer Complaint Form, and the Driveability Checklist at the end of Section TS. Follow the instructions on the forms before continuing with this tree.

 

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the Fault Code Troubleshooting Manual, Bulletin
4022225, for fault code troubleshooting.

 

Lubricating oil level is below specification

Check the oil level. Refer to Procedure 007-009 and
Procedure 007-037 in Section 7.

 

Fan clutch, hydraulic pump, or refrigerant compressor noise is excessive

Isolate each component and check for noise. Refer to the OEM service manual.

 

Fan is loose, damaged, or not balanced

Check the fan. Refer to
Procedure 008-040 in Section 8
.

 

Air intake or exhaust piping is contacting the chassis or cab

Inspect the air piping, chassis, and cab for contact points. Refer to Procedure 010-031 and Procedure 010-080 in Section 10.

 

Engine mounts are worn, damaged, loose, or not correct

Verify the condition of the mounts. Refer to Procedure 016-010 in Section 16.

 

Air intake or exhaust leaks

Check for loose or damaged piping connections and missing pipe plugs. Check the turbocharger and exhaust manifold mounting. Refer to
Procedure 010-024 in Section 10
.

 

Turbocharger noise

Refer to the Engine Noise Excessive – Turbocharger symptom tree.

 

Vibration damper has failed

Remove the vibration damper and operate the engine at the rpm where the noise normally occurs. If the noise is still present, proceed to the next step. If the noise is eliminated, replace the vibration damper. Refer to
Procedure 001-052 in Section 1
.

 

Drivetrain noise is excessive

Disconnect the drivetrain. Check for engine noise. Refer to the OEM service manual.

 

Air compressor noise is excessive

Refer to the Air Compressor Noise Is Excessive symptom tree.

 

Overhead adjustments are not correct

Measure and adjust the overhead settings. Refer to
Procedure 003-004 in Section 3
.

 

Overhead components are damaged

Inspect the rocker levers, rocker shafts, and valves for damage or excessive wear. Refer to
Procedure 003-009 in Section 3
.

 

Injector(s) are malfunctioning

Perform diagnostics to find the damaged injector(s). Replace the injector(s) as necessary. Refer to
Procedure 006-026 in Section 6
.

 

Flywheel is loose or damaged

Check the flywheel. Refer to
Procedure 016-005 in Section 16
.

 

Gear train backlash is excessive or the gear teeth are damaged

Check the gear backlash and the gear teeth for excessive wear.
Procedure 001-055 in Section 1.

 

Main bearing or connecting rod bearing noise

Refer to the Engine Noise Excessive – Main Bearing or Engine Noise Excessive – Connecting Rod symptom trees.

 

Piston, piston rings, or cylinder liner is worn or damaged

Refer to the Engine Noise Excessive – Piston symptom tree.

 

Rear engine power take-off (REPTO) noise is excessive

Disassemble and repair the REPTO as necessary. Refer to Procedure 009-022 in Section 9.

 

Combustion knocks

Refer to Engine Noise Excessive – Combustion Knocks symptom tree.

 

Internal engine damage

Analyze the oil and inspect the filters to locate an area of probable damage. Refer to Procedure 007-013 and
Procedure 007-083 in Section 7.

 
Last Modified:  09-Jul-2010