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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 >> Assembly Procedure
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Assembly Procedure

IMPORTANT: 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.
  1. Line up the square-cut hole in the vane wheel for the camshaft position (CMP) sensor.
    Fig 1: Identifying Square-Cut Hole In Vane/Reluctor Wheel
    GM156754Courtesy of GENERAL MOTORS CORP.
  2. Insert the sensor into the housing.
    Fig 2: View Of CMP Sensor
    GM156755Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  3. Install two new screws for the camshaft position (CMP) sensor.

    Tighten:  Tighten the screws to 2.2 N.m (19 lb in).

    Fig 3: View Of CMP Sensor & Screws
    GM301398Courtesy of GENERAL MOTORS CORP.
  4. Identify the correct rotor mounting position:
    • At the rotor screw holes (1)
    • At the rotor locator pin holes (2)
    Fig 4: Distributor Locator Pin Holes & Rotor Screw Holes
    GM156752Courtesy of GENERAL MOTORS CORP.
  5. Install the distributor rotor according to the index marks.
  6. Install two rotor hold down screws.

    Tighten:  Tighten the screws to 1.9 N.m (17 lb in).

    Fig 5: Expanded View Of Distributor Rotor
    GM301396Courtesy of GENERAL MOTORS CORP.
  7. Install the shim washer (1) on the bottom of the distributor shaft.
    Fig 6: Identifying Distributor Shaft Shim Washer
    GM301405Courtesy of GENERAL MOTORS CORP.
  8. Install the tang washer.
  9. Install the round washer.
  10. Install the driven gear according to the index marks.
  11. Align the rotor segment as shown for a V6 engine (1) or V8 engine (2).
    Fig 7: Aligning Indent Hole & Locating Mark
    GM301395Courtesy of GENERAL MOTORS CORP.
  12. Install the gear and align white paint mark on the bottom stem of the distributor, and the pre-drilled indent hole in the bottom of the gear (3).
  13. Check to see if the driven gear is installed incorrectly. On an incorrectly installed driven gear, the dimple will be approximately 180 degrees opposite the rotor segment when the gear is installed in the distributor.
    CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
  14. Support the distributor drive gear in a V-block or similar fixture.
    Fig 8: Removing Roll Pin
    GM301198Courtesy of GENERAL MOTORS CORP.
  15. Install the roll pin with a suitable punch and hammer in order to hold the driven gear in the correct position.
  16. Install the new oil seal under the mounting flange of the distributor base.
    Fig 9: Locating Distributor Base Oil Seal
    GM301419Courtesy of GENERAL MOTORS CORP.
  17. Install the distributor.
  18. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.
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