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Flywheel Runout Check

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
Special Tools

Illustration Tool Name Tool Number
GF0000025Courtesy of FORD MOTOR CO.
Dial Indicator/Magnetic Base 100-D002 (D78P-4201-B) or equivalent
NOTE: Do not reface the flywheel surface. Install a new flywheel as necessary.
    CAUTION: Do not use petroleum-based cleaning solutions. They will contaminate the clutch disc.
    NOTE: Always inspect the flywheel whenever the clutch is removed or installed new.
  1. Using a suitable cleaning solution, clean the flywheel clutch surface.
  2. Inspect the flywheel for the following conditions:
    • Surface cracks
    • Heat check
    • Glazing
    • Scoring
    • Scratches or grooves
      • For minor damage, finish the flywheel surface with coarse emery cloth or with a fine grade (400 grit) sandpaper.
  3. Inspect the ring gear for:
    • worn, chopped or broken teeth.
  4. Mount the special tool so that the indicator contact point rides on the clutch disc contact surface.
  5. Rotate the flywheel and measure the runout. If the runout exceeds the maximum allowance, install a new flywheel. Refer to the appropriate Engine for the procedure.
  6. Fig 1: Rotating Flywheel & Measuring Runout
    GF0001001Courtesy of FORD MOTOR CO.