Repair Pontiac Mid-size 1974-1983 Repair Guide

HEI System Maintenance

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Except for periodic checks of the spark plug wires, and an occasional check of the distributor cap for cracks (see Steps 1 and 2 under "Engine Runs, But Runs Rough or Cuts Out" for details), no maintenance is required on the HEI System. No periodic lubrication is necessary; engine oil lubricates the lower bushing, and an oil-filled reservoir lubricates the upper bushing.

COMPONENT REPLACEMENT



Integral Ignition Coil


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Fig. Fig. 1 To remove the integral ignition coil, first remove the spark plug wire set retainer



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Fig. Fig. 2 Although not necessary, you can matchmark the ignition coil wire to the terminal ...



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Fig. Fig. 3 ... then disconnect the wire from the ignition coil



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Fig. Fig. 4 Loosen the ignition coil cover bolts ...



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Fig. Fig. 5 ... then remove the cap from the coil



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Fig. Fig. 6 Unfasten the ignition coil-to-distributor retaining screws ...



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Fig. Fig. 7 ... then remove the armrest from the door panel



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Fig. Fig. 8 Remove and clean the rubber seal washer ...



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Fig. Fig. 9 ... and the ignition coil spring



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Fig. Fig. 10 Before installing, coat the rubber seal washer with a suitable silicone dielectric compound



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Fig. Fig. 11 To remove the distributor cap, first tag all of the wires to avoid confusion during installation



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Fig. Fig. 12 After unlatching the retainers, remove the distributor cap

  1. Remove the ignition wire set retainer.
  2.  
  3. Disconnect the feed and module wire terminal connectors from the distributor cap.
  4.  
  5. Remove the 4 coil cover-to-distributor cap screws and the coil cover.
  6.  
  7. Remove the 4 coil-to-distributor cap screws.
  8.  
  9. Using a blunt drift, press the coil wire spade terminals up out of the distributor cap.
  10.  
  11. Lift the coil up out of the distributor cap.
  12.  
  13. Remove and clean the coil spring, rubber seal washer and coil cavity of the distributor cap.
  14.  
  15. Coat the rubber seal with a dielectric lubricant furnished in the replacement ignition coil package.
  16.  
  17. Installation is the reverse of the removal procedure.
  18.  

Distributor Cap
  1. Remove the feed and module wire terminal connectors from the distributor cap.
  2.  
  3. Remove the retainer and spark plug wires from the cap.
  4.  
  5. Depress and release the 4 distributor cap-to-housing retainers and lift off the cap assembly.
  6.  
  7. Remove the 4 coil cover screws and cover.
  8.  
  9. Using a finger or a blunt drift, push the spade terminals up out of the distributor cap.
  10.  
  11. Remove all 4 coil screws and lift the coil, coil spring and rubber seal washer out of the cap coil cavity.
  12.  
  13. Using a new distributor cap, reverse the removal procedure, being sure to clean and lubricate the rubber seal washer with dielectric lubricant.
  14.  

Rotor
  1. Disconnect the feed and module wire connectors from the distributor.
  2.  
  3. Depress and release the 4 distributor cap-to-housing retainers and lift off the cap assembly.
  4.  
  5. Remove the two rotor attaching screws and rotor.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  



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Fig. Fig. 13 For rotor removal, first remove the distributor cap, then loosen the 2 retaining screws (see arrows) ...



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Fig. Fig. 14 ... and pull the rotor up and off the distributor

Vacuum Advance (1975-80)
  1. Remove the distributor cap and rotor as previously described.
  2.  
  3. Disconnect the vacuum hose from the vacuum advance unit.
  4.  
  5. Remove the two vacuum advance retaining screws, pull the advance unit outward, rotate and disengage the operating rod from its tang.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

Ignition Module


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Fig. Fig. 15 When replacing the ignition module, be sure to coat the mating surfaces with silicone lubricant



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Fig. Fig. 16 Some distributor components, such as the module (arrow), are accessible once the rotor is removed



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Fig. Fig. 17 To remove the ignition module, detach the electrical connectors



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Fig. Fig. 18 Remove the ignition module retaining screws ...



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Fig. Fig. 19 ... then remove the ignition module from the distributor



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Fig. Fig. 20 Before installation, coat the bottom of the new module with dielectric silicone lubricant

  1. Remove the distributor cap and rotor as previously described.
  2.  
  3. Disconnect the harness connector and pick-up coil spade connectors from the module. Be careful not to damage the wires when removing the connector.
  4.  
  5. Remove the two screws and module from the distributor housing.
  6.  
  7. Coat the bottom of the new module with dielectric silicone lubricant supplied with the new module. Installation is the reverse of the removal procedure.
  8.  

The silicone lubricant supplied with new modules must be applied, as it serves as a heat insulator and aids in module cooling. The module will "cook" itself without the lubricant.

 
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