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How to change Chrysler 300C Spark Plugs in under an hour

Old 10-16-2015, 10:24 PM
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Join Date: Oct 2005
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Default How to change Chrysler 300C Spark Plugs in under an hour

Did this the other day - thought I would post up some tips and a tool list on how I did it. If you go online to ehow or other sites and ask how to change the plugs on a 300C - many tell you what a pain it is and that it will take you all afternoon. With these tools you can do it in less then an hour.

Standard 1/4" hex head impact driver, with a 1/4" adapter, 6" extension, u-joint, and a 10mm socket. Also I have a 1/4" to 3/8" adapter there - explain in a minute.

One of these - which despite coming from Harbor Freight - has been one of my favorite tools: 1/4 in, 3/8 in. Drive Long Reach Dual Flex Head Ratchet

3/8" drive 6" extension, u-joint, 5/8" plug socket

Torque wrench that will do 13 ft/lbs. Mine is a Craftsman 3/8" drive.

Remove plastic top cover on engine. Pops right off. You will see the coil packs on each valve cover. There are 2 10mm bolts on each one. Use the Impact driver setup to zip the bolts out. Carefully pull the coils up out of the plug holes and lay them straight back on top the intake. You don't need to remove any wires. If you have access to compressed air - blow the plug holes out before removing plugs just to get rid of any loose dirt. Use the 3/8" drive ratchet, extension, u-joint, and 5/8" plug socket to get in to the plugs, and break every one loose. Attach the 1/4" to 3/8" adapter to the 1/4" drive extension on the impact driver, add the 5/8" plug socket, and use that to buzz the plugs out of their holes. Take your 16 new plugs and add Anti-Seize to the threads. I removed the extension from the impact driver and used it by hand to start all the plugs in the holes to make sure they were threaded correctly, then put it back on impact driver and ran them down just to where they bottomed. Torque to 13 ft/lbs. Put coils back down in holes and start the bolts by hand to avoid cross threading. Buzz down with impact driver - don't overtighten, just snug. Replace engine cover and you're done!

I found this works really well - the plugs are "long winded" and will take all day to unscrew/screw in by hand. So I figured out how to use the impact driver to do it. A drill would probably work too, just be careful not to get too carried away with it. I've also found that sometimes the rubber deal in the plug socket will not allow the socket to come out of the hole with the extension. SO I took that out and just put a small piece of duct tape on one flat of my 5/8" socket. It's enough to hold the plug but not too much.

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