300, 300C & Magnum 2006-2008, Charger 2006-2008

Spark Plugs

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Removal & Installation



2.7L & 3.5L Engines

NOTE
Always remove the ignition coil assembly by grasping at the spark plug boot, turning the assembly 1 / 2 turn and pulling straight back in a steady motion.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the intake manifold.
  6.  
  7. Prior to removing the ignition coils, spray compressed air around the coil area and spark plug to remove contaminates from around spark plug tube.
  8.  
  9. On 3.5L engines, it is necessary to loosen the screws by alternating back and forth. Do not lose the spacers under the coil when loosening the screws.
  10.  
  11. Remove the ignitions coil.
  12.  
  13. Remove the spark plug using a quality socket with a rubber or foam insert.
  14.  
  15. Inspect the spark plug condition.
  16.  

To install:

  1. To avoid cross threading, start the spark plug into the cylinder head by hand.
  2.  
  3. Tighten spark plugs. Tighten to 20 ft. lbs. (28 Nm).
  4.  
  5. Install ignition coil assembly onto spark plug.
  6.  
  7. Hand tighten the coil screws.
  8.  
  9. Tighten the ignition coil screws to 60 in. lbs. (6.7 Nm).
  10.  
  11. Connect and lock the electrical connector.
  12.  
  13. Install the intake manifold.
  14.  
  15. Connect the negative battery cable.
  16.  

5.7L Engines

A separate ignition coil, mounted to the valve cover is used for each cylinder. Each coil fires the two spark plugs at times predetermined by the Powertrain Control Module (PCM).

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Unlock the electrical connector by pressing on tab while pulling electrical connector from the coil.
  4.  
  5. Remove two coil mounting bolts.
  6.  
  7. Carefully pull up coil from cylinder head opening with a slight twisting action. Twisting will help break loose boots from spark plugs.

    Click image to see an enlarged view

    Fig. Ignition coil removal with boots (1) shown

  8.  

To install:

  1. Before installing coil(s), apply dielectric grease to inside of spark plug boots.
  2.  
  3. Position ignition coil into valve cover and push both spark plug boots onto each spark plug.
  4.  
  5. Install two coil mounting bolts and tighten to 106 in. lbs. (12 Nm).
  6.  
  7. Connect the electrical connector to the ignition coil and lock connector.
  8.  

 
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