Chevrolet Full Size Cars 1979-1989

Distributor

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For ignition system service not found below, please refer to of this guide.

REMOVAL





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Fig. Fig. 1 Scribe matchmarks for the distributor housing and rotor alignment



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Fig. Fig. 2 Loosen and remove the hold-down clamp bolt



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Fig. Fig. 3 Then remove the hold-down clamp and begin withdrawing the distributor assembly



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Fig. Fig. 4 Lift the distributor upward until the bottom of the shaft clears the bore in the intake manifold

  1. Disconnect the negative cable from the battery.
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  3. Tag and disengage the feed and module terminal connectors from the distributor cap.
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  5. If equipped, disconnect the hose from the distributor vacuum advance unit.
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  7. Depress and release the distributor cap-to-housing retainers and lift off the cap assembly. On most integral coil caps there are 4 cap-to-housing spring loaded retainers.
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  9. 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 or otherwise matchmark the rotor with the housing.
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  11. Loosen and remove the distributor hold-down bolt and clamp, then carefully lift the distributor out of the engine. Note the position of the rotor alignment mark on the housing and make a second mark on the housing to align with the rotor. You may wish to reinstall the distributor cap in order to protect the internal components from damage.
  12.  

INSTALLATION



Undisturbed Engine
  1. With a new O-ring on the distributor housing and the rotor aligned with the second mark on the housing, install the distributor, taking care to align the distributor body mark with the mark scribed on the engine. When fully installed, the rotor should turn and align with the first distributor housing mark and therefore point in the same direction as before removal. It may be necessary to lift the distributor and turn the rotor slightly to properly align the gears and the oil pump driveshaft.
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  3. With the respective marks aligned, install the clamp and bolt finger-tight.
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  5. Install and secure the distributor cap.
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  7. Engage the feed and module connectors to the distributor cap.
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  9. Connect a timing light to the engine and either plug the vacuum hose or disconnect the distributor set timing connector.
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  11. Connect the negative cable to the battery.
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  13. Start the engine and set the timing, then secure the distributor clamp bolt.
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  15. Recheck the timing to assure it was not changed while tightening the clamp bolt, then shut the engine
  16.  

OFF . Disconnect the timing light and either unplug and connect the hose to the vacuum advance or reconnect the distributor timing connector.

Disturbed Engine
  1. Remove the No. 1 spark plug.
  2.  
  3. Place a finger over the No. 1 spark plug hole and rotate the engine by hand until the compression can be felt.
  4.  

An alternate method of finding No. 1 TDC when the valve cover for that cylinder bank is removed involves watching to see if the valves open as the timing mark approaches 0. If any valves open, then the engine is 360 degrees out of No. 1 TDC and should be turned one full revolution. If the valves remain closed, it signifies that the cylinder was on its compression stroke and is at TDC when the mark reaches 0 on the timing plate.

  1. Align the timing mark on the crankshaft pulley with the
  2.  

0 mark on the timing plate.

  1. Align the distributor rotor near the No. 1 spark plug tower.
  2.  
  3. Install the distributor, the hold down clamp, the bolt and the cap. It may be necessary to turn the rotor a little in either direction in order to engage the gears.
  4.  

With the distributor installed, make sure that the rotor is aligned with the No. 1 spark plug tower of the cap.

  1. Connect the negative battery cable, then start and run the engine.
  2.  
  3. Properly check and adjust the ignition timing.
  4.  

 
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