GM Full Size Vans 1987-1997 Repair Guide

Distributor

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REMOVAL



See Figures 1 through 4



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Fig. Fig. 1: Unfasten and remove the distributor cap



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Fig. Fig. 2: If necessary, unfasten the retaining screws and remove the rotor:

  1. Disconnect the negative battery cable.
  2.  
  3. Tag and remove the spark plug wires and the coil leads from the distributor.
  4.  
  5. Disengage the electrical connector at the base of the distributor.
  6.  
  7. Loosen the distributor cap fasteners and remove the cap.
  8.  
  9. Using a marker, matchmark the rotor-to-housing and housing-to-engine block positions so that they can be matched during installation.
  10.  
  11. Loosen and remove the distributor hold-down bolt.
  12.  
  13. Remove the distributor from the engine.
  14.  



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Fig. Fig. 3: Using a distributor wrench, unfasten the hold-down bolt and clamp



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Fig. Fig. 4: Remove the distributor from the engine

INSTALLATION



Engine Not Disturbed
  1. Install the distributor in the engine making sure that the matchmarks are properly aligned.
  2.  
  3. Install and tighten the hold-down bolt.
  4.  
  5. Install the distributor cap and engage the electrical connector at the base of the distributor.
  6.  
  7. Install the spark plug wires and coil leads.
  8.  
  9. Connect the negative battery cable.
  10.  

Engine Disturbed
  1. Remove the No. 1 cylinder spark plug. Turn the engine using a socket wrench on the large bolt on the front of the crankshaft pulley. Place a finger near the No. 1 spark plug hole and turn the crankshaft until the piston reaches Top Dead Center (TDC). As the engine approaches TDC, you will feel air being expelled by the No. 1 cylinder. The timing mark on the crankshaft pulley should now be aligned with the O mark on the timing scale. If the position is not being met, turn the engine another full turn (360 degrees). Once the engine's position is correct, install the spark plug.
  2.  
  3. Turn the rotor so that it will point to the No. 1 terminal of the distributor cap.
  4.  
  5. Install the distributor in the engine. It may be necessary to turn the rotor a little in either direction, in order to engage the gears.
  6.  
  7. Tap the starter a few times to ensure that the oil pump shaft is mated to the distributor shaft.
  8.  
  9. Bring the engine to TDC again and check that the rotor is pointed toward the No. 1 terminal of the cap. If the marks are all aligned, install and tighten the hold-down bolt.
  10.  
  11. Install the cap and fasten the mounting screws.
  12.  
  13. Engage the electrical connections and the spark plug wires.
  14.  

 
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