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A printable/PDF version of this How-To can be found HERE.

This how-to outlines the steps for replacing the spark plugs on a 4.7L engine. It is especially geared toward anyone having problems with the tricky #8 plug.

** Note: Click photos to enlarge **

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Tools Required:

  • 3/8” Ratchet
  • 10mm Socket
  • 5/8” Spark Plug Socket
  • Swivel Adapter
  • 3” Extension
  • 10” Extension
  • Flat Head Screwdriver
  • Spark Plug Gapper
Spark Plugs_Page_1_Image_0001.jpg

Procedure:

1. To remove the Air Hat, unscrew these two screws with a Flat Head Screwdriver.
Spark Plugs_Page_1_Image_0002.jpg

2. Remove the 10mm bolts under the Air Hat and the wire harness.
Spark Plugs_Page_2_Image_0001.jpg Spark Plugs_Page_2_Image_0002.jpg

3. Remove the Air Hat, then unclip the heater line.
Spark Plugs_Page_2_Image_0003.jpg
 

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4. Remove the wire harness and the 10mm nut holding down the coil pack.
Spark Plugs_Page_3_Image_0001.jpg

5. Lift up and remove the coil pack. Use a 5/8” Spark Plug socket to remove Spark Plug.

6. Gap Spark Plugs at .040 with a Gaper. Place new Spark Plug on the socket and replace
Spark Plugs_Page_3_Image_0002.jpg

7. Install Coil Pack, replace 10mm nut to coil pack and connect wire harness.

8. Process is the same for Spark Plugs numbers 1, 2, 4, 5, 6, and 7.
Spark Plugs_Page_4_Image_0001.jpg

9. Remove the 10mm bolt to the heater clip above Spark Plug number 3, then repeat steps 4-7.
Spark Plugs_Page_4_Image_0002.jpg

10. Reinstall heater clip with 10mm bolt.

The following steps are specific to the #8 plug:

11. Remove the 10mm nut on Spark Plug number 8 by using a: 10mm Socket, Swivel Adapter, 10” Extension, 3/8” Ratchet.
Spark Plugs_Page_5_Image_0001.jpg
 

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12. Remove the wire harness.
Spark Plugs_Page_5_Image_0002.jpg

13. Carefully remove the Coil Pack.
Spark Plugs_Page_6_Image_0001.jpg

14. Remove the Spark Plug using the following: Spark Plug Socket, 3” Extension, Swivel Adapter, 10” Extension, 3/8” Ratchet.
Spark Plugs_Page_6_Image_0002.jpg

15. Place new Spark Plug in the Spark Plug Socket and replace into head.

16. Carefully insert the Coil Pack onto the Spark Plug and install 10mm nut. Replace wire harness to Coil Pack.

17. Clip the three heater clips to the hardline.
Spark Plugs_Page_7_Image_0001.jpg

18. Replace the Air Hat. Connect the wire harness and the 10mm bolts.
Spark Plugs_Page_7_Image_0002.jpg
 

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Spark plug replacement

I just inherited an 02 durango with about 125 K miles. The plugs have never been changed and I was going to attempt this weekend. Would you see big problems with getting them out after being in for so long?
 

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2008 Durango

How is it possible to remove upper plug ignition coils without ripping plug boots at end of coil. the lower plug boots are no problem but upper boots rip. thank you for any assistance
 
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