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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - 4.3L - Introduction (2 Of 2)) >> Repair Instructions >> Distributor Overhaul >> Disassembly Procedure

Disassembly Procedure

WARNING: This page is about a different variant/trim than selected.
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.
  1. Remove the distributor. Refer to Distributor Replacement .
  2. Align the white paint mark on the bottom stem of the distributor, with the pre-drilled indent hole in the bottom of the gear (2).
    Fig 1: Aligning Distributor Marks
    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 rotor screws.
    Fig 2: Removing Rotor
    GM301396Courtesy of GENERAL MOTORS CORP.
  5. Remove the rotor.
  6. Note the locating holes that the rotor screws were removed from:
    Fig 3: View Of Rotor Screw Holes & Locator Pin Holes
    GM156752Courtesy of GENERAL MOTORS CORP.
    • The rotor screw holes (1)
    • The rotor locator pin holes (2)
  7. Line up the square-cut hole in the vane wheel with the camshaft position (CMP) sensor.
    Fig 4: Aligning Square-Cut Hole In Vane Wheel
    GM156754Courtesy of GENERAL MOTORS CORP.
  8. Remove and discard the CMP sensor screws.
    Fig 5: View Of CMP Sensor & Screws
    GM301398Courtesy of GENERAL MOTORS CORP.
  9. Remove the CMP sensor.
    Fig 6: Removing CMP Sensor
    GM156755Courtesy of GENERAL MOTORS CORP.
  10. 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 assembly.
    11. CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
  11. Support the distributor drive gear in a V-block or similar fixture.
  12. Drive out the roll pin with a suitable punch.
    Fig 7: Driving Out Roll Pin
    GM301198Courtesy of GENERAL MOTORS CORP.
  13. Remove the driven gear from the distributor shaft.
  14. Remove the round washer.
  15. Remove the tang washer.
  16. Remove the shim washer (1).
    Fig 8: Removing Distributor Shaft Shim Washer
    GM301405Courtesy of GENERAL MOTORS CORP.
  17. Remove the oil seal.
    Fig 9: Removing Distributor Shaft Oil Seal
    GM301419Courtesy of GENERAL MOTORS CORP.
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