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Engine Control System - 4.3L (Introduction): Overhaul GMC Savana G2500

Testing & Diagnostics ~454 words

Disassembly Procedure

  1. Remove the engine cover. Refer to «Engine Cover Replacement»(ref-186605-S04737176332005083000000) in Interior Trim.
  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).
  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 two screws from the rotor.
  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)
  7. Line up the square-cut hole in the vane wheel with the camshaft position (CMP) sensor.
  8. Remove the two screws that hold the camshaft position (CMP) sensor.
  9. Discard the screws.
  10. Remove the CMP sensor.
  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.
  13. Drive out the roll pin with a suitable punch.
  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).
  18. Remove the old oil seal.

Assembly Procedure

  1. Line up the square-cut hole in the vane wheel for the camshaft position (CMP) sensor.
  2. Insert the sensor into the housing.
  3. Install two new screws for the camshaft position (CMP) sensor. Tighten: Tighten the screws to 2.2 N.m (20 lb in).
  4. Identify the correct rotor mounting position: At the rotor screw holes (1) At the rotor locator pin holes (2)
  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).
  7. Install the shim washer (1) on the bottom of the distributor shaft.
  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).
  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, the dimple will be approximately 180 degrees opposite the rotor segment when it is installed in the distributor.
  14. Support the distributor drive gear in a V-block or similar fixture.
  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.
  17. Install the distributor.
  18. Install the engine cover. Refer to «Engine Cover Replacement»(ref-186605-S04737176332005083000000) in Interior Trim.

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