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Inspection and Verification

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  1. Verify the customer concern by operating the system.
  2. Visually inspect for obvious signs of mechanical damage.
    VISUAL INSPECTION CHART

    Mechanical
    • Damaged or contaminated belt
    • Belt tension
    • Belt tensioner
    • Pulleys
    • Loose hardware
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    NOTE: Up to 15 cracks in a rib over a distance of 100 mm (3.93 in) can be considered acceptable. If damage exceeds the acceptable limit or any chunks are found to be missing from the ribs, a new belt must be installed.

    Under no circumstances should the belt or tensioner be lubricated as potential damage to the belt material construction and tensioner damping mechanism can occur.

    Fig 1: Identifying V-Ribbed Serpentine Belt With Piling
    G03882222Courtesy of FORD MOTOR CO.
  4. The condition of the drive belt should be compared against the illustration and appropriate action taken.
    1. Small scattered deposits of rubber material. This is not a concern, therefore, installation of a new belt is not required.
    2. Longer deposit areas building up to 50 percent of the rib height. This is not considered a concern but it can result in excessive noise. If noise is apparent, install a new belt.
    3. Heavy deposits building up along the grooves resulting in a possible noise and belt stability concern. If heavy deposits are apparent, install a new belt.
      Fig 2: V-Ribbed Serpentine Drive Belt With Cracks Across Ribs
      G04584090Courtesy of FORD MOTOR CO.
  5. Check the belt for cracks. Up to 15 cracks in a rib over a distance of 100 mm (3.93 in) can be considered acceptable. If cracks exceed this standard, install a new belt.
    Fig 3: Identifying V-Ribbed Serpentine Belt With Chunks Of Rib Missing
    G03900414Courtesy of FORD MOTOR CO.
  6. There should be no chunks missing from the belt ribs. If the belt shows any evidence of this, install a new belt.
  7. If the concern is not visually evident, verify the symptom and GO to SYMPTOM CHART .
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