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Home >> Chevrolet >> 2004 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 4.3L - Introduction >> Repair Instructions >> Distributor Overhaul >> Disassembly Procedure
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Disassembly Procedure

  1. Remove the engine cover. Refer to Engine Cover Replacement in Interior Trim.
    NOTE: The ignition system distributor driven gear and rotor may be installed in multiple positions. In order to avoid mistakes, mark the distributor on the following components in order to ensure the same mounting position upon reassembly:
    • The distributor driven gear
    • The distributor shaft
    • The rotor holes

    Installing the driven gear 180 degrees out of alignment, or locating the rotor in the wrong holes, will cause a no-start condition. Premature engine wear or damage may result.
  2. Align white paint mark on the bottom stem of the distributor, and the pre-drilled indent hole in the bottom of the gear (2).
    Fig 1: Aligning Indent Hole & Locating Mark
    GM301395Courtesy of GENERAL MOTORS CORP.
  3. With the gear in this position, the rotor segment should be positioned as shown for a V6 engine (1). If not, replace the distributor.
  4. Remove the 2 screws from the rotor.
    Fig 2: Expanded View Of Distributor Rotor
    GM301396Courtesy of GENERAL MOTORS CORP.
  5. Remove the rotor.
  6. Note the locating holes that the rotor was removed from:
    • The rotor screw holes (1)
    • The rotor locator pin holes (2)
    Fig 3: Distributor Locator Pin Holes & Rotor Screw Holes
    GM156752Courtesy of GENERAL MOTORS CORP.
  7. Line up the square-cut hole in the vane wheel with the CMP sensor.
    Fig 4: Identifying Square-Cut Hole In Vane/Reluctor Wheel
    GM156754Courtesy of GENERAL MOTORS CORP.
  8. Remove the 2 screws that hold the camshaft position (CMP) sensor.
    Fig 5: View Of CMP Sensor & Screws
    GM301398Courtesy of GENERAL MOTORS CORP.
  9. Discard the screws.
  10. Remove the CMP sensor.
    Fig 6: View Of CMP Sensor
    GM156755Courtesy of GENERAL MOTORS CORP.
  11. Note the dimple located below the roll pin hole on one side of the gear. The dimple will be used to properly orient the gear onto the shaft during reassembly.
  12. Support the distributor drive gear in a V-block or similar fixture.
    CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
  13. Drive out the roll pin with a suitable punch.
    14. Fig 7: Removing Roll Pin
    GM301198Courtesy of GENERAL MOTORS CORP.
  14. Remove the driven gear from the distributor shaft.
  15. Remove the round washer.
  16. Remove the tang washer.
  17. Remove the shim washer (1).
    Fig 8: Identifying Distributor Shaft Shim Washer
    GM301405Courtesy of GENERAL MOTORS CORP.
  18. Remove the old oil seal.
    Fig 9: Locating Distributor Base Oil Seal
    GM301419Courtesy of GENERAL MOTORS CORP.
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