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  #133  
Old 09-06-2015, 06:36 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Did you guys use anti seize on the new plugs? The old ones didn't look like they had any.

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  #134  
Old 09-06-2015, 08:54 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

I did not use antisieze.
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  #135  
Old 09-07-2015, 03:28 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by billt View Post
Did you guys use anti seize on the new plugs? The old ones didn't look like they had any.
I did. I also torqued to 18. We'll see what happens when it comes time to change the spark plugs.
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  #136  
Old 09-07-2015, 04:22 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by nathantw View Post
I did. I also torqued to 18. We'll see what happens when it comes time to change the spark plugs.
It's ALWAYS good to use Anti Seize on plugs. Especially on Aluminum heads.
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  #137  
Old 09-07-2015, 06:34 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Probably should have but these came out easily even at almost 69000 miles. I don't plan to run the next ones that long though.
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  #138  
Old 10-06-2015, 11:25 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by billt View Post
Did you guys use anti seize on the new plugs? The old ones didn't look like they had any.

no.
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  #139  
Old 11-07-2015, 03:04 PM
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I just changed the plugs in my JGC 5.7 hemi using the tools and guidance covered in these posts. The original post was right on with the tools needed and process, and several other post provided some helpful tips. It took 1 hr. and 43 minutes and was in my opinion, other than the time spent, the easiest spark plug change I ever done (except my lawnmower). Thanks for helping me save about $178.00.
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  #140  
Old 05-19-2016, 01:41 AM
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Re: DIY: Hemi 5.7L Spark Plug Change

Let me also do some advice. While doing sparks do not forget to check and clean high voltage terminal at the coils and conductive springs inside the boots.

ImageUploadedByJeepGarage1463636305.373971.jpg

the left one is cleaned.
There are also sone oxidation might be found inside the coils terminals.
ImageUploadedByJeepGarage1463636451.785189.jpg




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  #141  
Old 05-22-2016, 02:14 AM
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Re: DIY: Hemi 5.7L Spark Plug Change

Thanks for the guide....there's one remaining unanswered question in the middle of this thread (and some conflict between the amount of torque to use on these plugs.)

Initial instructions say 12-14lbs, later instructions say 18-22lbs, plus some posts in between alluding to the impact anti-seize will have on the torque.

I'm guessing getting the plugs between 12 and 14lbs with anti-seize, and 18-22 lbs without is probably about the same difference.

Curious where the original poster pulled the 12-14lbs from, and if he still supports that (and if not, the initial posting should be edited - some people won't read through 11 pages of comments!).

John
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  #142  
Old 09-08-2016, 08:56 AM
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Re: DIY: Hemi 5.7L Spark Plug Change

Not sure if the OP is still around but the photos are missing in the first post.

Do not EVER use anti seize on modern spark plugs. They do not need it and it affects the tightening torque.

Proper torque on the 2011 5.7l LZFR5C11 plugs is 18 Nm +/-2Nm (13 lb-ft)
Proper gap is 1.09mm (.043")
Proper torque on the coil packs is 7 Nm (5 lb-ft)

FWIW, after 33,000 miles all 16 plugs showed no noticeable wear and the gap was on the loose side of 1.1mm. However, the insulators showed signs of heat damage. This might be the reason for the 34k change interval. Just a hypothesis.
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  #143  
Old 09-08-2016, 09:28 AM
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Re: DIY: Hemi 5.7L Spark Plug Change

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Originally Posted by The Evil Twin View Post
Do not EVER use anti seize on modern spark plugs. They do not need it and it affects the tightening torque.
I've read that in the latest $7.99 Chilton's Manuals too. Anti seize prevents and protects the soft Aluminum threads in the cylinder head from galling when the plugs are removed. This is extremely important in Aluminum cylinder heads. And the fact many of these Aluminum head engines are going 100K miles before a change is required, make the use of it an even greater necessity.

Also, dissimilar metals and a bit of moisture create electrolysis, and will corrode the interface junction. NOT a good thing. Anti-seize will not prevent the threads from getting a good ground through the head, as some claim. In fact with the copper impregnated anti seize compounds, it actually will help increase it. I have NEVER heard of a mechanic at a dealership, or anywhere else say not to use it.

Personally, I have used anti seize compounds, (both Loc-Tite / Permatex C-5A and Never Seize brands), for over 45 years on every spark plug I've ever replaced in cars, trucks, boats, motorcycles, and ATV's, and have never had a single issue.... Ever. And this involves hundreds of spark plug installations over 4 decades. Many of which have had a small squeeze packet of anti seize accompanying the plugs inside the box. On the other hand, I've seen countless issues of galling along with the accompanied stripped threads that almost always result, on cylinder heads, (both Aluminum and cast iron), where it was NOT used. After 45 years without a problem, I've learned to stick with what works.
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  #144  
Old 09-08-2016, 10:56 AM
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Re: DIY: Hemi 5.7L Spark Plug Change

The plating process on the plugs is such that it is no longer necessary. Nowhere in any FSM for any of my vehicles does it say to use any compound on the threads. All of them have aluminum heads.
On my two race bikes the plugs get changed every season. One of them is on the 7th set of plugs with no galling, no sticking no problems.
YMMV
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