Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Distributor

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REMOVAL & INSTALLATION



1969-74 Models


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Fig. Fig. 1 Installation of the point type distributor-1969-74 6-cylinder engines



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Fig. Fig. 2 Exploded view of point type distributor components-6-cylinder engines



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Fig. Fig. 3 Exploded view of point type distributor components-8-cylinder engines

  1. Remove the distributor cap and position it out of the way.
  2.  
  3. Disconnect the primary coil wire (the thin wire) and the vacuum advance line(s).
  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 distributor hold-down bolt.
  8.  
  9. Slowly pull the distributor up. The rotor will turn a little bit as it is removed. Carefully note the position of the rotor when it stops turning. This is the position that the distributor must be in when the distributor is installed.
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  11. To install the distributor with the engine undisturbed:
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    1. Carefully insert the distributor into the block with the rotor positioned as outlined in the previous step. The rotor will turn slightly as the distributor is inserted and return to its original position.
    2.  
    3. Install the retaining clamp and bolt. Install the distributor cap, primary wire, and the vacuum hose(s).
    4.  
    5. Start the engine and check the ignition timing.
    6.  

  13. If the engine was rotated:
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    1. Turn the engine to bring the No. 1 piston to the top of its compression stroke. This may be determined by covering the No. 1 spark plug hole with your thumb and slowly turning the engine. When the timing mark on the crankshaft pulley aligns with the 0 on the timing scale and your thumb is pushed out by compression, No. 1 piston is at Top-Dead-Center (TDC). If you don't feel compression, you've got No. 6 at TDC.
    2.  
    3. Align the distributor to the engine block so that the vacuum advance unit points in the correct direction.
    4.  
    5. Turn the rotor so that it will point to the No. 1 terminal in the cap. Some distributors have a punch mark on the gear facing the same way as the rotor tip.
    6.  
    7. Install the distributor into the engine block. It may be necessary to turn the rotor a little in either direction in order to engage the gears.
    8.  
    9. Tap the starter a few times to ensure that the oil pump shaft is mated to the distributor shaft.
    10.  
    11. Bring the engine to No. 1 TDC again and check to see that the rotor is indeed pointing toward the No. 1 terminal of the cap.
    12.  
    13. After correct positioning is assured, turn the distributor housing so that the points are just opening. Tighten the clamp.
    14.  
    15. Install the cap and primary wire. Check the ignition timing. Install the vacuum hose(s).
    16.  


1975-82 Models


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Fig. Fig. 4 Exploded view of HEI distributor components



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Fig. Fig. 5 To remove the distributor, disconnect the hose from the vacuum advance diaphragm



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Fig. Fig. 6 Remove the cap, then matchmark the position of the rotor and distributor base to the engine



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Fig. Fig. 7 Use a distributor wrench to loosen the hold-down bolt ...



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Fig. Fig. 8 ... then remove the hold-down bolt and clamp from the vehicle



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Fig. Fig. 9 Lift the distributor straight up and out of the engine

  1. Disconnect the wiring harness connectors at the side of the distributor cap.
  2.  
  3. Remove the distributor cap by turning the latches counterclockwise and lay it aside.
  4.  
  5. Disconnect the vacuum advance line(s).
  6.  
  7. Scribe a mark on the engine in line with the rotor and note the approximate position of the vacuum advance unit in relation to the engine.
  8.  
  9. Remove the distributor hold-down clamp and nut.
  10.  
  11. Slowly lift the distributor. The rotor will turn slightly as this is done. Carefully note the position of the rotor when it stops turning. This is the position it must be in when the distributor is installed.
  12.  
  13. Installation is the same as the point-type distributors.
  14.