Hyundai Tucson: Free Running Inspection

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Electrical System / Starting System / Free Running Inspection

  1. Place the starter motor in a vise equipped with soft jaws and connect a fully-charged 12-volt battery to starter motor as follows.
  2. Connect a test ammeter (150-ampere scale) and carbon pile rheostats shown is the illustration.
  3. Connect a voltmeter (15-volt scale) across starter motor.

  1. Rotate carbon pile to the off position.
  2. Connect the battery cable from battery's negative post to the starter motor body.
  3. Adjust until battery voltage shown on the voltmeter reads 11.5 and 11 volts.
  4. Confirm that the maximum amperage is within the specifications and that the starter motor turns smoothly and freely.

Armature Inspection and Test

Armature Inspection and Test

  1. Remove the starter.
  2. Disassemble the starter as shown at the beginning of this procedure.
  3. Inspect the armature for wear or damage from contact with the permanent magnet. If there is wear or damage, replace the armature.

  1. Check the commutator (A) surface. If the surface is dirty or burnt, resurface with emery cloth or a lathe within the following specifications, or recondition with #500 or #600 sandpaper (B).

  1. Measure the commutator (A) runout.
  • If the commutator runout is within the service limit, check the commutator for carbon dust or brass chips between the segments.
  • If the commutator run out is not within the service limit, replace the armature.

Commutator runout

Standard (New) : 0.05 mm (0.0019 in.) max

Service limit : 0.08 mm (0.0031 in.)

  1. 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).

Commutator mica depth

Standard (New) : 0.7 mm (0.0276 in.)

Limit : 0.2 mm (0.0079 in.)

  1. Check for continuity between the segments of the commutator. If an open circuit exists between any segments, replace the armature.

  1. Check with an ohmmeter that no continuity exists between the commutator (A) and armature coil core (B), and between the commutator and armature shaft (C). If continuity exists, replace the armature.

Inspect Starter Brush

Inspect Starter Brush

Any worn out or oil-soaked brushes should be replaced.

Starter Brush Holder Test


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