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Flex Plate

By Andy Y, April 27, 2009

The flex plate is a stamped metal disk that mounts the torque converter to the rear of the engine’s crankshaft. The flex plate has a ring gear around the circumference to mate with the starter motor.

Symptoms of a Bad or Failing Flex Plate

  • Knocking or rattling noise from rear of engine
  • Abnormal noise when operating engine starter

Flex Plate Related Repair Advice

  • If the teeth engaged by the starter motor are damaged, the starter motor should be inspected for damage also
  • Loose torque convertor bolts can be misdiagnosed as a cracked flywheel
  • In combination, the flex plate and torque convertor mirror the function of the flywheel to smooth out the shock caused by firing cylinders

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