Repair Pontiac Mid-size 1974-1983 Repair Guide

Distributor

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REMOVAL & INSTALLATION





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Fig. Fig. 1 Exploded view of a point-type distributor-250 6-cylinder engine shown



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Fig. Fig. 2 V8 engine point-type distributor components



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Fig. Fig. 3 Hei Distributor Components



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Fig. Fig. 4 To remove the distributor, disconnect the BAT feed wire ...



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Fig. Fig. 5 ... detach the coil electrical connector



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Fig. Fig. 6 Unplug the module electrical connectors



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Fig. Fig. 7 Depress and release the distributor cap-to-housing retainers ...



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Fig. Fig. 8 ... then lift the cap up off the distributor



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Fig. Fig. 9 Use a marker to matchmark the rotor to the distributor housing



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Fig. Fig. 10 Matchmark the position of the distributor in the engine block



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Fig. Fig. 11 Use a distributor wrench to unfasten the hold-down bolt ...



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Fig. Fig. 12 ... then remove the distributor from the engine

1974 Vehicles with Point-type Ignition
  1. Remove the distributor cap and position it out of the way.
  2.  
  3. Disconnect the primary coil wire and the vacuum advance hose.
  4.  
  5. Scribe a mark on the distributor body and the engine block showing their relationship. Mark the distributor housing to show the direction in which the rotor is pointing. Note the positioning of the vacuum advance unit.
  6.  
  7. Remove the hold-down bolt and clamp and remove the distributor.
  8.  

To install:

  1. Reinsert the distributor into its opening, aligning the previously made marks on the housing and the engine block.
  2.  
  3. The rotor may have to be turned either way a slight amount to align the rotor-to-housing marks.
  4.  
  5. Install the retaining clamp and bolt. Install the distributor cap, primary wire or electrical connector, and the vacuum hose.
  6.  
  7. Start the engine and check the ignition timing.
  8.  

To install the distributor with the engine disturbed:

  1. Turn the engine to bring No. 1 piston to the top of its compression stroke. This may be determined by placing your finger over the No. 1 spark plug hole and slowly turning the engine over. When the timing mark on the crankshaft pulley aligns with the 0 on the timing scale you will feel pressure against your finger. This is when the No. 1 cylinder is on the compression stroke.
  2.  

On some 400 and 455 V8 engines there is a punch mark on the distributor drive gear which indicates the rotor position. Thus, the distributor may be installed with the cap in place. Align the punch mark 2° clockwise from the No. 1 cap terminal, then rotate the distributor body 1 / 8 turn counterclockwise and push the distributor down into the block.

  1. Install the distributor in the engine block so that the vacuum advance unit points in the correct direction.
  2.  
  3. Turn the rotor so that it will point to No. 1 terminal in the cap. It may be necessary to