Series 40E Troubleshooting – 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 Troubleshooting Manual – 6SE241
Generated on 10-13-2008