MDX V6-3.7L (2007)
7. Check the commutator (A) surface. If the surface is dirty or burnt, resurface it with an emery cloth or a lathe to the following specifications, or
recondition with #500 or #600 sandpaper (B).
8. Check the commutator diameter. If the diameter is below the service limit, replace the armature.
9. Measure the commutator (A) runout.
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If the commutator runout is within the service limit, check the commutator for carbon dust or brass chips between the segments.
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If the commutator runout is not within the service limit, replace the armature.
10. Check the mica depth (A). If the mica is too high (B), undercut the mica with a hacksaw blade to the proper depth. Cut away all the mica (C)
between the commutator segments. The undercut should not be too shallow, too narrow, or V-shaped (D).
