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Jeep Cherokee
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Clutch » Diagnosis and testing
Clutch flywheel runout

Check flywheel runout whenever misalignment is suspected. Flywheel runout should not exceed 0.08 mm (0.003 in.). Measure runout at the outer edge of the flywheel face with a dial indicator. Mount the indicator on a stud installed in place of one of the flywheel bolts.

Common causes of runout are:

  •  heat warpage
  •  improper machining
  •  incorrect bolt tightening
  •  improper seating on crankshaft flange shoulder
  •  foreign material on crankshaft flange

Flywheel machining is not recommended. The flywheel clutch surface is machined to a unique contour and machining will negate this feature. However, minor flywheel scoring can be cleaned up by hand with 180 grit emery, or with surface grinding equipment.

Remove only enough material to reduce scoring (approximately 0.001 - 0.003 in.). Heavy stock removal is not recommended. Replace the flywheel if scoring is severe and deeper than 0.076 mm (0.003 in.). Excessive stock removal can result in flywheel cracking or warpage after installation; it can also weaken the flywheel and interfere with proper clutch release.

Clean the crankshaft flange before mounting the flywheel. Dirt and grease on the flange surface may cock the flywheel causing excessive runout. Use new bolts when remounting a flywheel and secure the bolts with Mopart Lock And Seal. Tighten flywheel bolts to specified torque only. Overtightening can distort the flywheel hub causing runout.

    More about «Diagnosis and testing»:

    Safety precautions

    Installation methods and parts usage

    Clutch diagnostic information

    Clutch contamination

    Improper clutch release or engagement

    Clutch misalignment

    Clutch housing misalignment

    Clutch flywheel runout

    Clutch cover and disc runout

    Clutch diagnosis charts

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