6.7L Cummins Troubleshooting – Engine Noise Excessive – Connecting Rod

Electronic fault codes active or high counts of inactive fault codes

View and troubleshoot the fault codes with INSITETM. Refer to the Troubleshooting and Repair
Manual, CM21 00 and CM2150 Electronic Control System, Bulletin 4021570.

Lubricating oil level is below specification

Check the oil level. Verify the dipstick calibration and the oil pan capacity. Fill the system to the
specified level. Refer to Procedures 007-043 and 007-009.

Lubricating oil is thin or diluted

Refer to Procedure 007-083 to check if the oil is contaminated. If the lubrication oil is contaminatedsee the Lubricating Oil Contaminated symptom tree.

Lubricating oil pressure is below specification

Check the oil pressure. If the pressure is low, refer to the Lubricating Oil Pressure Low symptom tree.

Lubricating oil suction or transfer tube misassembled

Remove and inspect the lubricating oil suction or transfer tube. Refer to Procedure 007-035.

Block stiffener plate is misassembled

Remove and inspect block stiffener plate. Refer to Procedure 001-089.

Connecting rod and bearings are damaged or worn, are not assembled correctly, or are the wrong bearings

Inspect the connecting rod and bearings. Refer to Procedures 001-006 and 001-054.

Connecting rod is ber:1t or out of alignment

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

Crankshaft journals are damaged or out of round

Inspect the crankshaft journals. Refer to Procedure 001-016.