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  #61  
Old 03-24-2014, 08:09 AM
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Just recently changed the plugs on my Jeep 5.7 Hemi.......this thread helped a lot... Very informative ...used oem plugs....
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  #62  
Old 03-29-2014, 07:26 PM
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Read this thread. Changed my plugs @ 32k and everything went smooth. Thanks sixzerofour
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  #63  
Old 04-30-2014, 09:53 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

plug change done. thanks for posting this thread! a few thoughts:

if you have a compressor, blow out around the modules before removing, this will help get dust out from around them. As OP said, plenty of dielectric left on the modules so no more needed at least at first change.

I went with the "oem" NGK iridium "cop motor" plugs. I checked all 16, all were gapped right at 0.044" out of the box. Runs maybe a bit better now..

old plugs were all looking OK at 32000, 2 years, and some hard driving in cold city use, and highway and mountain use. I would think if someone wanted to push the OEM's they could, as others' have mentioned. I gapped them all around 0.046". I have a pic of all if interested.
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  #64  
Old 05-02-2014, 03:55 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

So for the OEM Plugs SPLZFRC11, is the torque 12-14 ft/lbs or 18~21.6 ft/lbs? I would not want to screw this up (no pun intended).
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  #65  
Old 05-20-2014, 02:34 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

I'm about to order plugs for my 2012 GC Overland with the hemi and want to double check on the whole anti seize issue. Coming from the turbo Subaru realm, I was always told not to use anti seize on the plugs because it will result in over tightening, regardless of whether or not you torqued it to spec. The reasoning behind it is that (forgive my layman explanation) the anti seize is more material on the threads so 18 ft/lb torque without anti seize is not the same as cranking it to 18 ft/lb with anti seize because there is more material/mass on the threads. I'm trying to figure out how to explain it clearly. Think of a 2 liter soda bottle half full. If you step on it, it will allow room for it to expand around your foot and flex. If you then fill the bottle with more liquid and step on it, the bottle will crack since there is more liquid and less room inside.

Not sure if my explanation helped at all. It's been years since I looked into the issue but to this day I have never used anti seize on any of my plugs and I usually only do them around 50-60k miles. I was using NGK 1 step colder plugs and the vehicle was making 400 hp.
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  #66  
Old 05-20-2014, 02:48 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
When replacing the spark plugs, a common mistake people make is use anti-seize on them. Rightly so they want to prevent the plugs from seizing inside the head. Maybe it is a good idea with crappy plugs and an old iron head but you should never do this with a VG30E motor and NGK plugs.

Using anti-seize on spark plugs will do the following:

-Alters the tightening torque by up to 20% which may cause over-tightening (or breaking the spark bolt)
-Reduces electrical ground contact if the anti-seize is non-conductive or semi-conductive (reduced spark possible)
-Isolates more heat into the spark plug therefore causing the plug to increase the heat range above specification (can cause detonation/pre-ignition)
-Creates a big goopy mess when tightening

The thing with NGK plugs is that they are already self-lubricating and corrosion resistant. They have to be installed dry. Never put anti-seize on them. I used to only coat the washer but as of recently found no need to even do that. Change those plugs once in a while and they will never seize up and you get great gas mileage. Remember to check the gap!

Additional reading:

http://www.ngksparkplugs.com/pdf/TB-...1antisieze.pdf

http://www.ngksparkplugs.com/pdf/DYK_5Points.pdf
Why you should never use anti-seize on spark plugs - The Garage - NPORA Forums
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  #67  
Old 05-20-2014, 05:02 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

If you are going to install NGK 100 THOUSAND MILE plugs into your aluminum heads YOU BETTER use a dab of antiseize on them if you want to remove them one day!

I don't care what NGK recommends. My OEM NGK plugs were replaced at 2 years of service and those same plugs that NGK claimed to be "self-lubricating and corrosion resistant" were already beginning to corrode on the threads.

If your concerned about proper plug grounding use a hi heat copper antiseize, just a dab, and always install using a good torque wrench.

The galvanic corrosion that will occur with two dissimilar metals over thousands of heat cycles and thousands of miles will seize your plugs into your aluminum heads. To those who don't believe get back to us in another 100K miles when you need to replace your "self-lubricating and corrosion resistant" NGK plugs!

Wasn't this already covered in this thread??
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Old 05-21-2014, 10:14 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

"I don't care what NGK recommends. My OEM NGK plugs were replaced at 2 years of service and those same plugs that NGK claimed to be "self-lubricating and corrosion resistant" were already beginning to corrode on the threads. "

Mine weren't.
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  #69  
Old 06-02-2014, 11:40 AM
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DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by Raptor View Post
You shouldn't have a problem w/ the new Mopar NGK Iridium plugs, they are OEM for all 2014+ 5.7L Hemi's; & can be used in all previous 5.7L Hemi's.

Mopar # SP-143877AA MSRP $17.25 (They come pre-gapped @ .044")

Just a better quality longer life OEM NGK 100K mi plug vs. the OEM 30K mi copper ones
I am a bit confused. My 2012 Hemi isn't ready for plugs yet but when I asked the dealer about iridium plugs he told me I might have an issue since the PCM was programmed for the copper plugs. Truth or BS?






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Old 06-03-2014, 09:38 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by dizz1979 View Post
I am a bit confused. My 2012 Hemi isn't ready for plugs yet but when I asked the dealer about iridium plugs he told me I might have an issue since the PCM was programmed for the copper plugs. Truth or BS?






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Complete nonsense from yet another misinformed "Dealer" who should know better.

The OEM part # for those iridium plugs is correct and as of right now Chrysler V8 Hemi's are the only engine NGK lists those plugs for! They are OEM for all 2014's and good to go for all 2011~2013 WK2 Jeeps and Durangos with the Hemi V8.
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Old 06-03-2014, 11:22 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

My dealer confirmed the iridium plugs would work in my 2012hemi... And they do.. All 200 bucks worth! No issues at all in about 1000 miles.

Dealer BS is everywhere...

I bet most siezed plugs were originally over torqued.. ?? I don't use antisieze, I use an Armstrong torque wrench.
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Old 06-04-2014, 05:06 AM
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DIY: Hemi 5.7L Spark Plug Change

Thanks it seemed odd to me that they would say this. Spark is spark.

Are these plugs only sold at Jeep/Chrysler dealerships or are they available anywhere?


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