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Pinpoint Test F: The Generator Is Noisy

  1. F1 CHECK FOR ACCESSORY DRIVE BELT NOISE AND LOOSE MOUNTING BRACKETS 
    • Ignition OFF.
    • Check the accessory drive belt and tensioner for damage and correct installation. Refer to ACCESSORY DRIVE .
    • Check the accessory mounting brackets and generator pulley for looseness or misalignment.

    Is the accessory drive OK? 

    • Yes  : GO to F2  .
    • No  : REPAIR as necessary. REFER to Accessory Drive for diagnosis and testing of the accessory drive system. TEST the system for normal operation.
  2. F2 CHECK THE GENERATOR MOUNTING 
    • Check the generator mounting for loose bolts or misalignment.

    Is the generator mounted correctly? 

    • Yes  : GO to F3  .
    • No  : REPAIR as necessary. TEST the system for normal operation.
  3. F3 CHECK THE GENERATOR FOR NOISE 
    • With the engine running, use a stethoscope or equivalent listening device to probe the generator and the accessory drive area for unusual mechanical noise.

    Is the generator the noise source? 

    • Yes  : INSTALL a new generator. REFER to the GENERATOR  in this article.
    • No  : REFER to DIAGNOSIS AND TESTING to diagnose the source of the engine noise.
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