Section 1.2
Service Diagnosis
Service diagnosis is a systematic procedure of investigation to be followed to locate and correct an engine problem. The engine is first considered as a complete unit in its specific application and then the problem is localized to components or systems; intake, exhaust, cooling, lubrication or injection. Testing procedures will then help analyze the source of the problem.
Prerequisites for effective diagnosis include:
- Knowledge of the principles of operation for both the engine and application systems.
- Knowledge to perform and understand all procedures in the diagnostic and service manuals.
- Availability of and the ability to use gages and diagnostic test equipment.
- Have available the current information for the engine application.
Although the cause of an engine failure may be apparent, very often the real cause is not found until a repeat failure occurs. This can be prevented if specific diagnostic action is taken prior to, during and after engine disassembly and during engine reassembly.
It is also very important that specific diagnostic tests follow engine reassembly prior to and after the engine is placed back into service.
Identification of the symptoms that lead to engine failure is the result of proper service diagnosis. Effective service diagnosis requires use of the following references:
- Series 40E Service Manual, 6SE0242
- Hard Start / No Start (refer to “10 Hard Start / No Start Diagnostics”
) and Performance Engine Diagnostics (refer to “11 Performance Diagnostics”
)
- Electronic Control System Diagnostics refer to “12 Electronic Control System Diagnostics”
- Service Bulletins
| Series 40E Troubleshooting Manual – 6SE241 |
| Generated on 10-13-2008 |
