Avalanche, Sierra, Silverado, C&K Series, 1999-2005

Distributor

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4.8L, 5.3L, 6.0L and 8.1L engines use a distributorless ignition system.

Installation



4.3L Engine
Timing 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 through the No. 1 cylinder spark plug hole. The timing mark on the crankshaft pulley should now be aligned with the 0 mark on the timing scale. If the position is not being met, turn the engine another full turn (360 degrees). Once the engines position is correct, install the spark plug.
    NOTE
    Before installation, position the rotor so it points to the No. 2 terminal on the cap. As the distributor is lowered into the engine, the rotor will rotate clockwise and stop at the No. 1 terminal. This is the desired position.

  2.  
  3. Turn the rotor so that it will point to the No. 1 terminal of the distributor cap when it is fully seated in the engine.
  4.  
  5. Install or connect the following:
    NOTE
    If the distributor will not seat completely in the engine, remove the distributor and align the groove on the top of the oil pump drive shaft with a long screwdriver to match the tab on the bottom of the distributor shaft. Reinstall the distributor.



    Distributor. 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.
  10.  
  11. Install or connect the following:

    Hold-down bolt and tighten
     
    Cap and fasten the mounting screws
     
    Electrical connections and the spark plug wires
     

  12.  

  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 through the No. 1 cylinder spark plug hole. The timing mark on the crankshaft pulley should now be aligned with the 0 mark on the timing scale. If the position is not being met, turn the engine another full turn (360 degrees). Once the engines position is correct, install the spark plug.
    NOTE
    Before installation, position the rotor so it points to the No. 2 terminal on the cap. As the distributor is lowered into the engine, the rotor will rotate clockwise and stop at the No. 1 terminal. This is the desired position.

  2.  
  3. Turn the rotor so that it will point to the No. 1 terminal of the distributor cap when it is fully seated in the engine.
  4.  
  5. Install or connect the following:
    NOTE
    If the distributor will not seat completely in the engine, remove the distributor and align the groove on the top of the oil pump drive shaft with a long screwdriver to match the tab on the bottom of the distributor shaft. Reinstall the distributor.



    Distributor. 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.
  10.  
  11. Install or connect the following:

    Hold-down bolt and tighten
     
    Cap and fasten the mounting screws
     
    Electrical connections and the spark plug wires
     

  12.  

Timing Not Disturbed
  1. Install or connect the following:

    Distributor, aligning the matchmarks are properly alignment
     
    Distributor hold-down bolt
     
    Distributor cap
     
    Electrical connector at the base of the distributor
     
    Spark plug wires and coil leads
     
    Negative battery cable
     

  2.  

  1. Install or connect the following:

    Distributor, aligning the matchmarks are properly alignment
     
    Distributor hold-down bolt
     
    Distributor cap
     
    Electrical connector at the base of the distributor
     
    Spark plug wires and coil leads
     
    Negative battery cable
     

  2.  

4.3L, 5.0L, 5.7L And 7.4L Engines
Timing 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 through the No. 1 cylinder spark plug hole. The timing mark on the crankshaft pulley should now be aligned with the 0 mark on the timing scale. If the position is not being met, turn the engine another full turn (360 degrees). Once the engines position is correct, install the spark plug.
    NOTE
    Before installation, position the rotor so it points to the No. 2 terminal on the cap. As the distributor is lowered into the engine, the rotor will rotate clockwise and stop at the No. 1 terminal. This is the desired position.

  2.  
  3. Turn the rotor so that it will point to the No. 1 terminal of the distributor cap when it is fully seated in the engine.
  4.  
  5. Install or connect the following:
    NOTE
    If the distributor will not seat completely in the engine, remove the distributor and align the groove on the top of the oil pump drive shaft with a long screwdriver to match the tab on the bottom of the distributor shaft. Reinstall the distributor.



    Distributor. 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.
  10.  
  11. Install or connect the following:

    Hold-down bolt and tighten
     
    Cap and fasten the mounting screws
     
    Electrical connections and the spark plug wires
     

  12.  

Timing Not Disturbed
  1. Install or connect the following:

    Distributor, aligning the matchmarks are properly alignment
     
    Distributor hold-down bolt
     
    Distributor cap
     
    Electrical connector at the base of the distributor
     
    Spark plug wires and coil leads
     
    Negative battery cable
     

  2.  

5.7L And 7.4L Engines
Timing 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 TDC. As the engine approaches TDC, you will feel air being expelled through the No. 1 cylinder spark plug hole. The timing mark on the crankshaft pulley should now be aligned with the 0 mark on the timing scale. If the position is not being met, turn the engine another full turn (360 degrees) Once the engines position is correct, install the spark plug.
    NOTE
    Before installation, position the rotor so it points to the No. 2 terminal on the cap. As the distributor is lowered into the engine, the rotor will rotate clockwise and stop at the No. 1 terminal. This is the desired position.

  2.  
  3. Turn the rotor so that it will point to the No. 1 terminal of the distributor cap when it is fully seated in the engine.
  4.  
  5. Install the distributor. It may be necessary to turn the rotor a little in either direction, in order to engage the gears.
    NOTE
    If the distributor will not seat completely in the engine, remove the distributor and align the groove on the top of the oil pump drive shaft with a long screwdriver to match the tab on the bottom of the distributor shaft. Reinstall the distributor.

  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. Check that the marks are all aligned.
  10.  
  11. Install or connect the following:

    Hold-down bolt and tighten
     
    Cap and fasten the mounting screws
     
    Electrical connections and the spark plug wires
     

  12.  

Timing Not Disturbed
  1. Install or connect the following:

    Distributor, aligning the matchmarks properly
     
    Distributor hold-down bolt
     
    Distributor cap
     
    Electrical connector at the base of the distributor
     
    Spark plug wires and coil leads
     
    Negative battery cable
     

  2.  

Removal



4.3L Engine
  1. Remove or disconnect the following:

    Negative battery cable
     
    Spark plug wires and the coil leads from the distributor
     
    Electrical connector at the base of the distributor
     
    Distributor cap
     

  2.  
  3. Matchmark the rotor-to-housing and housing-to-engine block positions so that they can be matched during installation.

    Distributor hold-down bolt
     
    Distributor from the engine
     

  4.  

  1. Remove or disconnect the following:

    Negative battery cable
     
    Spark plug wires and the coil leads from the distributor
     
    Electrical connector at the base of the distributor
     
    Distributor cap
     

  2.  
  3. Matchmark the rotor-to-housing and housing-to-engine block positions so that they can be matched during installation.

    Distributor hold-down bolt
     
    Distributor from the engine
     

  4.  

Removal & Installation



4.3L, 5.0L, 5.7L, 7.4L Distributor
  1. Remove or disconnect the following:

    Negative battery cable
     
    Spark plug wires and the coil leads from the distributor
     
    Electrical connector at the base of the distributor
     
    Distributor cap
     

  2.  
  3. Matchmark the rotor-to-housing and housing-to-engine block positions so that they can be matched during installation.

    Distributor hold-down bolt
     
    Distributor from the engine
     

  4.  

Installation
Timing 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 TDC. As the engine approaches TDC, you will feel air being expelled through the No. 1 cylinder spark plug hole. The timing mark on the crankshaft pulley should now be aligned with the 0 mark on the timing scale. If the position is not being met, turn the engine another full turn (360 degrees) Once the engines position is correct, install the spark plug.
    NOTE
    Before installation, position the rotor so it points to the No. 2 terminal on the cap. As the distributor is lowered into the engine, the rotor will rotate clockwise and stop at the No. 1 terminal. This is the desired position.

  2.  
  3. Turn the rotor so that it will point to the No. 1 terminal of the distributor cap when it is fully seated in the engine.
  4.  
  5. Install or connect the following:
    NOTE
    If the distributor will not seat completely in the engine, remove the distributor and align the groove on the top of the oil pump drive shaft with a long screwdriver to match the tab on the bottom of the distributor shaft. Reinstall the distributor.



    Distributor. 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.
  10.  
  11. Install or connect the following:

    Hold-down bolt and tighten
     
    Cap and fasten the mounting screws
     
    Electrical connections and the spark plug wires
     

  12.  

  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 TDC. As the engine approaches TDC, you will feel air being expelled through the No. 1 cylinder spark plug hole. The timing mark on the crankshaft pulley should now be aligned with the 0 mark on the timing scale. If the position is not being met, turn the engine another full turn (360 degrees) Once the engines position is correct, install the spark plug.
    NOTE
    Before installation, position the rotor so it points to the No. 2 terminal on the cap. As the distributor is lowered into the engine, the rotor will rotate clockwise and stop at the No. 1 terminal. This is the desired position.

  2.  
  3. Turn the rotor so that it will point to the No. 1 terminal of the distributor cap when it is fully seated in the engine.
  4.  
  5. Install or connect the following:
    NOTE
    If the distributor will not seat completely in the engine, remove the distributor and align the groove on the top of the oil pump drive shaft with a long screwdriver to match the tab on the bottom of the distributor shaft. Reinstall the distributor.



    Distributor. 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.
  10.  
  11. Install or connect the following:

    Hold-down bolt and tighten
     
    Cap and fasten the mounting screws
     
    Electrical connections and the spark plug wires
     

  12.  

Timing Not Disturbed
  1. Install or connect the following:

    Distributor, aligning the matchmarks are properly alignment
     
    Distributor hold-down bolt
     
    Distributor cap
     
    Electrical connector at the base of the distributor
     
    Spark plug wires and coil leads
     
    Negative battery cable
     

  2.  

  1. Install or connect the following:

    Distributor, aligning the matchmarks are properly alignment
     
    Distributor hold-down bolt
     
    Distributor cap
     
    Electrical connector at the base of the distributor
     
    Spark plug wires and coil leads
     
    Negative battery cable
     

  2.  

Removal
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Spark plug wires and the coil leads from the distributor
     
    Electrical connector at the base of the distributor
     
    Distributor cap
     

  4.  
  5. Matchmark the rotor-to-housing and housing-to-engine block positions so that they can be matched during installation.

    Distributor hold-down bolt
     
    Distributor from the engine
     

  6.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Spark plug wires and the coil leads from the distributor
     
    Electrical connector at the base of the distributor
     
    Distributor cap
     

  4.  
  5. Matchmark the rotor-to-housing and housing-to-engine block positions so that they can be matched during installation.

    Distributor hold-down bolt
     
    Distributor from the engine
     

  6.  

4.8L, 5.3L And 6.0L Distributor

NOTE
If the Malfunction Indicator Lamp turns on, and a DTC code P1345 sets after installing the distributor, this indicates an incorrectly installed distributor. Engine damage or distributor damage may occur.


NOTE
If the Malfunction Indicator Lamp turns on, and a DTC code P1345 sets after installing the distributor, this indicates an incorrectly installed distributor. Engine damage or distributor damage may occur.

Installation, Engine Disturbed
  1. Rotate the number 1 cylinder to TDC of the compression stroke. The engine front cover has 2 alignment tabs and the crankshaft balancer has 2 alignment marks (spaced 90 degrees apart) which are used for positioning number 1 piston at top dead center (TDC). With the piston on the compression stroke and at top dead center, the crankshaft balancer alignment mark must align with the engine front cover tab and the crankshaft balancer alignment mark must align with the engine front cover tab.

    Click image to see an enlarged view

    Fig. Engine at TDC compression-4.8L, 5.3L, 6.0L

  2.  
  3. Align the white paint mark on the bottom stem of the distributor with the pre-drilled indent hole in the bottom of the gear. If the driven gear is installed incorrectly, the dimple will be approximately 180 degrees opposite of the rotor segment when it is installed in the distributor.
  4.  

The OBD II ignition system distributor driven gear and rotor may be installed in multiple positions. In order to avoid mistakes, mark the distributor on the following components in order to ensure the same mounting position upon reassembly:



The distributor driven gear
 
The distributor shaft
 
The rotor holes

Click image to see an enlarged view

Fig. Distributor alignment. 1 is the starting point; 2 is installed; 3 are the shaft alignment marks-4.8L, 5.3L, 6.0L

 

Installing the driven gear 180 degrees out of alignment, or locating the rotor in the wrong holes, will cause a no-start condition. Premature engine wear or damage may result.

  1. Using a long screwdriver, align the oil pump drive shaft to the drive tab of the distributor. Guide the distributor into the engine. Ensure that the spark plug towers are perpendicular to the centerline of the engine.
  2.  

Once the distributor is fully seated, the rotor segment should be aligned with the pointer cast into the distributor base.

Click image to see an enlarged view

Fig. Distributor fully seated-4.8L, 5.3L, 6.0L

This pointer may have a 6 cast into it, indicating that the distributor is to be used on a 6 cylinder engine or a 8 cast into it, indicating that the distributor is to be used on a 8 cylinder engine.

If the rotor segment does not come within a few degrees of the pointer, the gear mesh between the distributor and the camshaft may be off a tooth or more.

If this is the case, repeat the procedure again in order to achieve proper alignment.


NOTE
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the distributor mounting clamp bolt. Tighten the distributor clamp bolt to 25 Nm (18 ft. lbs.).
  2.  
  3. Install the distributor cap. Install two NEW distributor cap screws. Tighten the screws to 2.4 Nm (21 inch lbs.).
  4.  
  5. Install the electrical connector to the distributor.
  6.  
  7. Install the spark plug wires to the distributor cap.
  8.  
  9. Install the ignition coil wire.
    NOTE
    If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly.

  10.  

  1. Rotate the number 1 cylinder to TDC of the compression stroke. The engine front cover has 2 alignment tabs and the crankshaft balancer has 2 alignment marks (spaced 90 degrees apart) which are used for positioning number 1 piston at top dead center (TDC). With the piston on the compression stroke and at top dead center, the crankshaft balancer alignment mark must align with the engine front cover tab and the crankshaft balancer alignment mark must align with the engine front cover tab.

    Click image to see an enlarged view

    Fig. Engine at TDC compression-4.8L, 5.3L, 6.0L

  2.  
  3. Align the white paint mark on the bottom stem of the distributor with the pre-drilled indent hole in the bottom of the gear. If the driven gear is installed incorrectly, the dimple will be approximately 180 degrees opposite of the rotor segment when it is installed in the distributor.
  4.  

The OBD II ignition system distributor driven gear and rotor may be installed in multiple positions. In order to avoid mistakes, mark the distributor on the following components in order to ensure the same mounting position upon reassembly:



The distributor driven gear
 
The distributor shaft
 
The rotor holes

Click image to see an enlarged view

Fig. Distributor alignment. 1 is the starting point; 2 is installed; 3 are the shaft alignment marks-4.8L, 5.3L, 6.0L

 

Installing the driven gear 180 degrees out of alignment, or locating the rotor in the wrong holes, will cause a no-start condition. Premature engine wear or damage may result.

  1. Using a long screwdriver, align the oil pump drive shaft to the drive tab of the distributor. Guide the distributor into the engine. Ensure that the spark plug towers are perpendicular to the centerline of the engine.
  2.  

Once the distributor is fully seated, the rotor segment should be aligned with the pointer cast into the distributor base.

Click image to see an enlarged view

Fig. Distributor fully seated-4.8L, 5.3L, 6.0L

This pointer may have a 6 cast into it, indicating that the distributor is to be used on a 6 cylinder engine or a 8 cast into it, indicating that the distributor is to be used on a 8 cylinder engine.

If the rotor segment does not come within a few degrees of the pointer, the gear mesh between the distributor and the camshaft may be off a tooth or more.

If this is the case, repeat the procedure again in order to achieve proper alignment.


NOTE
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the distributor mounting clamp bolt. Tighten the distributor clamp bolt to 25 Nm (18 ft. lbs.).
  2.  
  3. Install the distributor cap. Install two NEW distributor cap screws. Tighten the screws to 2.4 Nm (21 inch lbs.).
  4.  
  5. Install the electrical connector to the distributor.
  6.  
  7. Install the spark plug wires to the distributor cap.
  8.  
  9. Install the ignition coil wire.
    NOTE
    If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly.

  10.  

Installation, Engine Not Disturbed
  1. If installing a new distributor assembly, place two marks on the new distributor housing in the same location as the two marks on the original housing. Remove the new distributor cap, if necessary. Align the rotor with mark made at location 2.
  2.  
  3. Guide the distributor into the engine. Align the hole in the distributor hold-down base over the mounting hole in the intake manifold.
  4.  
  5. As the distributor is being installed, observe the rotor moving in a clockwise direction about 42 degrees. Once the distributor is completely seated, the rotor segment should be aligned with the mark on the distributor base in location number 1. If the rotor segment is not aligned with the number 1 mark, the driven gear teeth and the camshaft have meshed one or more teeth out of alignment.
  6.  
  7. Remove or disconnect the following:


  8.  
  9. Distributor mounting clamp bolt. Tighten the distributor clamp bolt to 25 Nm (18 ft. lbs.).
  10.  
  11. Distributor cap. Install two NEW distributor cap screws. Tighten the screws to 2.4 Nm (21 inch lbs.).

    Click image to see an enlarged view

    Fig. Distributor electrical connection-4.8L, 5.3L, 6.0L

  12.  
  13. Electrical connector to the distributor
  14.  
  15. Spark plug wires to the distributor cap
  16.  
  17. Ignition coil wire.
    NOTE
    If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly.

  18.  

  1. If installing a new distributor assembly, place two marks on the new distributor housing in the same location as the two marks on the original housing. Remove the new distributor cap, if necessary. Align the rotor with mark made at location 2.
  2.  
  3. Guide the distributor into the engine. Align the hole in the distributor hold-down base over the mounting hole in the intake manifold.
  4.  
  5. As the distributor is being installed, observe the rotor moving in a clockwise direction about 42 degrees. Once the distributor is completely seated, the rotor segment should be aligned with the mark on the distributor base in location number 1. If the rotor segment is not aligned with the number 1 mark, the driven gear teeth and the camshaft have meshed one or more teeth out of alignment.
  6.  
  7. Remove or disconnect the following:


  8.  
  9. Distributor mounting clamp bolt. Tighten the distributor clamp bolt to 25 Nm (18 ft. lbs.).
  10.  
  11. Distributor cap. Install two NEW distributor cap screws. Tighten the screws to 2.4 Nm (21 inch lbs.).

    Click image to see an enlarged view

    Fig. Distributor electrical connection-4.8L, 5.3L, 6.0L

  12.  
  13. Electrical connector to the distributor
  14.  
  15. Spark plug wires to the distributor cap
  16.  
  17. Ignition coil wire.
    NOTE
    If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly.

  18.  

Removal
  1. Turn OFF the ignition switch.
  2.  
  3. Remove or disconnect the following:

    Spark plug wires from the distributor cap
     
    Electrical connector from the base of the distributor
     
    Two screws that hold the distributor cap to the housing. Discard the screws.
     
    Distributor cap from the housing

    Click image to see an enlarged view

    Fig. Distributor cap-4.8L, 5.3L, 6.0L

     

  4.  
  5. Use a grease pencil in order to note the position of the rotor in relation to the distributor housing.
  6.  
  7. Mark the distributor housing and the intake manifold with a grease pencil.
  8.  
  9. Remove or disconnect the following:

    Mounting clamp hold-down bolt
     
    Distributor

    Click image to see an enlarged view

    Fig. Distributor rotor starting point (1) and 42 degrees counterclockwise (2)-4.8L, 5.3L, 6.0L

     

  10.  
  11. As the distributor is being removed from the engine, watch the rotor move in a counterclockwise direction about 42 degrees. This will appear as slightly more than the 1 o-clock position. Note the position of the rotor segment. Place a second mark on the base of the distributor. This will aid in achieving proper rotor alignment during the distributor installation.
  12.  

  1. Turn OFF the ignition switch.
  2.  
  3. Remove or disconnect the following:

    Spark plug wires from the distributor cap
     
    Electrical connector from the base of the distributor
     
    Two screws that hold the distributor cap to the housing. Discard the screws.
     
    Distributor cap from the housing

    Click image to see an enlarged view

    Fig. Distributor cap-4.8L, 5.3L, 6.0L

     

  4.  
  5. Use a grease pencil in order to note the position of the rotor in relation to the distributor housing.
  6.  
  7. Mark the distributor housing and the intake manifold with a grease pencil.
  8.  
  9. Remove or disconnect the following:

    Mounting clamp hold-down bolt
     
    Distributor

    Click image to see an enlarged view

    Fig. Distributor rotor starting point (1) and 42 degrees counterclockwise (2)-4.8L, 5.3L, 6.0L

     

  10.  
  11. As the distributor is being removed from the engine, watch the rotor move in a counterclockwise direction about 42 degrees. This will appear as slightly more than the 1 o-clock position. Note the position of the rotor segment. Place a second mark on the base of the distributor. This will aid in achieving proper rotor alignment during the distributor installation.
  12.  

5.7L And 7.4L Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Spark plug wires and the coil leads from the distributor
     
    Electrical connector at the base of the distributor
     
    Distributor cap
     

  4.  
  5. Matchmark the rotor-to-housing and housing-to-engine block positions so that they can be matched during installation.

    Distributor hold-down bolt
     
    Distributor from the engine
     

  6.  

 
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