Symptom Tree t049
| Cause | Correction |
|---|
Refer to Engine Noise Diagnostic Procedures — General Information at the end of this section 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 Troubleshooting and Repair Manual, CM870 Electronic Control System, Signature and ISX Engines, Bulletin 4021334, or Troubleshooting and Repair Manual, Electronic Control System, Signature, ISX and QSX Engines, Bulletin 3666259, or Troubleshooting and Repair Manual, Power Generation Control Systems QSX15, QSK23, QSK45, QSK60, QSK78, and QST30 Series Engines, Bulletin 4021419 for fault code troubleshooting. |
|
|
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 007-009 and 007-037. |
|
|
Lubricating oil pressure is below specification |
Check the oil pressure. If the pressure is low, refer toProcedure 007-028. |
|
|
Internal engine damage |
Analyze the oil and inspect the filters to locate an area of probable damage. Refer to Procedure 007-083. |
|
|
Connecting rod capscrews are loose or not tightened correctly |
Check the torque on the connecting rod capscrews. Refer to Procedure 001-014. |
|
|
Connecting rod bearings are damaged or worn, are not assembled correctly, or are the wrong bearings |
Inspect the connecting rod bearings. Refer to Procedure 001-005. |
