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Home >> Chevrolet >> 2004 >> Epica LS >> Repair and Diagnosis >> Electrical >> Charging Systems >> Engine Electrical System >> Repair Instructions >> Generator Overhaul (2.0L) >> Disassembly Procedure

Disassembly Procedure

    Fig 1: View Of Generator Driveshaft Nut
    GM1255545Courtesy of GENERAL MOTORS CORP.
  1. Remove the generator. Refer to Generator Replacement (2.0L) .
  2. Remove the driveshaft nut.
    3. Fig 2: View Of Generator Driveshaft Pulley And Collar
    GM1255544Courtesy of GENERAL MOTORS CORP.
  3. Remove the pulley and the collar from the driveshaft.
    4. Fig 3: View Of Plastic Generator Cover
    GM1255543Courtesy of GENERAL MOTORS CORP.
  4. Pry off the plastic cover that encloses the rectifier and the regulator/brush holder assemblies. Inspect the cover for damage.
    5. Fig 4: Identifying Generator Through-Bolts
    GM1255550Courtesy of GENERAL MOTORS CORP.
  5. Remove the generator through-bolts.
    6. Fig 5: View Of Rectifier Assembly Bolts
    GM1255549Courtesy of GENERAL MOTORS CORP.
  6. Remove the bolts that fasten the rectifier assembly and the regulator/brush holder assembly to the slip ring end frame.
    7. Fig 6: Identifying Rectifier Assembly And Leads
    GM1255547Courtesy of GENERAL MOTORS CORP.
  7. To remove the regulator/brush holder and the rectifier assemblies, first melt the solder of the lead connecting the regulator/brush holder assembly to the rectifier assembly lead to the stator. Do the same to the other rectifier assembly leads to the stator, as shown.
    8. Fig 7: View Of Diode Continuity Check Procedure
    GM1255546Courtesy of GENERAL MOTORS CORP.
  8. Test each of the three diodes of the rectifier assembly for continuity. Connect the ohmmeter probes on each side of the diode. Retest by connecting the ohmmeter probes reversely. If the readings are the same, replace the rectifier.
    9. Fig 8: View Of Slip Ring End Frame And Collar
    GM1255555Courtesy of GENERAL MOTORS CORP.
  9. Mark a line perpendicular to the crack between the case of the drive end frame and that of the slip ring end frame.
  10. Pry open the drive end frame from the slip ring end frame.
  11. Remove the collar.
    12. Fig 9: Identifying Generator Fan
    GM1255553Courtesy of GENERAL MOTORS CORP.
  12. Remove the fan.
    13. Fig 10: View Of Rotor And Slip Ring End Frame
    GM1255552Courtesy of GENERAL MOTORS CORP.
  13. Separate the rotor from the slip ring end frame.
    14. Fig 11: View Of Stator Ground Testing Procedure
    GM1255551Courtesy of GENERAL MOTORS CORP.
  14. Using the ohmmeter, test the stator for ground. If the reading is low, replace the stator. Also check the stator for an open circuit by placing the probes on two terminals. If the reading is high (infinite), replace the stator.
    15. Fig 12: View Of Rotor Open Circuit Testing Procedure
    GM1255556Courtesy of GENERAL MOTORS CORP.
  15. Using an ohmmeter, test the rotor for an open circuit. Check that there is continuity between the slip rings. Standard resistance (cold) is 2.8-3.0 ohms. If there is no continuity, replace the rotor.
    16. Fig 13: View Of Rotor Ground Check Procedure
    GM1255557Courtesy of GENERAL MOTORS CORP.
  16. Using an ohmmeter, inspect the rotor for ground. Check that there is no continuity between the rotor and the slip ring.
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