DIY: Hemi 5.7L Spark Plug Change - Page 13 - Jeep Garage - Jeep Forum

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  #145  
Old 09-08-2016, 02:35 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by billt View Post
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.

I'm with you on most of your points, just a little older and definitely too old to quit. As you point out, zinc based anti-seize is the only type to use, if you must. Most all plugs are zinc plated now so galvanic reaction isn't a problem with aluminum heads. This may be the reason using it isn't mentioned in the fsm, nor by Champion in their install guide. However, thread repair kits are still available aren't they.

Since the torque spec here is 13 ft lb +/- 2 not to exceed 15, aim for the 13 and you'll still be in range, with or without anti-seize.


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  #146  
Old 09-15-2016, 01:16 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by clarklaflare View Post
I'm with you on most of your points, just a little older and definitely too old to quit. As you point out, zinc based anti-seize is the only type to use, if you must. Most all plugs are zinc plated now so galvanic reaction isn't a problem with aluminum heads. This may be the reason using it isn't mentioned in the fsm, nor by Champion in their install guide. However, thread repair kits are still available aren't they.

Since the torque spec here is 13 ft lb +/- 2 not to exceed 15, aim for the 13 and you'll still be in range, with or without anti-seize.


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Torque spec is now 18.5-22 ft lbs on 5.7 hemi. Gap is 0.043

Just changed my plugs for second time with Champion 446 at 111,000 since first change at 47,000 with OEM SPLZF-R5C11 NGK plugs. Mileage remained the same for the 64,000 miles on NGK plugs but noticeably smoother after change with Champion. On 1st tank since change so do not have milage difference if any.

OME plugs cost $4/plug and Champions were $2/plug. I plan to go at least 64,000 before another change based upon the condition of the plugs removed after 64,000. $32 not bad for a plug change which took a bit over an hour including gap check and coating plugs with never seize. Had used never seize on 1st change and plugs came out easily.
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  #147  
Old 09-20-2016, 08:23 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by falcon_o View Post
Torque spec is now 18.5-22 ft lbs on 5.7 hemi. Gap is 0.043

Just changed my plugs for second time with Champion 446 at 111,000 since first change at 47,000 with OEM SPLZF-R5C11 NGK plugs. Mileage remained the same for the 64,000 miles on NGK plugs but noticeably smoother after change with Champion. On 1st tank since change so do not have milage difference if any.

OME plugs cost $4/plug and Champions were $2/plug. I plan to go at least 64,000 before another change based upon the condition of the plugs removed after 64,000. $32 not bad for a plug change which took a bit over an hour including gap check and coating plugs with never seize. Had used never seize on 1st change and plugs came out easily.
What year do you have?
Mine specs 34000 mile intervals and the service manual (from Jeep) specs 13 Lb-ft
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  #148  
Old 09-21-2016, 10:47 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
What year do you have?
Mine specs 34000 mile intervals and the service manual (from Jeep) specs 13 Lb-ft
I have a 2012 Larado X with the 5.7l hemi. My dealer provided a torque specification sheet which has plug torque shown as 18.5 - 22 ft-lbs

The 34,000 miles change interval is BS as my two changes without loss of mileage for entire plug interval were at 47,000 (NGK SPLFZ-R5C11 @ $4/plug) and 111,000 (Champion 446 @ $2/plug ) Removed plugs looked good and gap was .001-.002 over 0.043 specification.
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  #149  
Old 09-21-2016, 12:49 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Gotcha. I know they changed the interval on newer models but your mileage didn't match up. At $50 sand an hour of my time, I'll stick to what they recommend. To each their own, of course.
The torque is interesting though. Wonder where they are getting that information. The service manual in the shop and on Tech Authority (as of June 2016) says 13 lb-ft +/-2 and not to exceed 15.
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  #150  
Old 09-21-2016, 02:51 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by The Evil Twin View Post
Gotcha. I know they changed the interval on newer models but your mileage didn't match up. At $50 sand an hour of my time, I'll stick to what they recommend. To each their own, of course.
The torque is interesting though. Wonder where they are getting that information. The service manual in the shop and on Tech Authority (as of June 2016) says 13 lb-ft +/-2 and not to exceed 15.
My owners manual specifies changing plugs at 32,000 using the NGK OEM plugs. If you use the NGK Yttirum the interval increases to 100,000 but these plugs are expensive.

Based upon my experience running copper core plugs to 64,000 has not resulted in a performance decrease thus my BS comment for the 32,000 specification. Change is easy and takes a bit over an hour and @ $2/Champion copper core plug not costly.

This link agrees with the torque specification provided by my dealer's service department.

Jeep Grand Cherokee WK2 - Maintenance information and schedules
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  #151  
Old 09-22-2016, 05:02 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by The Evil Twin View Post
Gotcha. I know they changed the interval on newer models but your mileage didn't match up. At $50 sand an hour of my time, I'll stick to what they recommend. To each their own, of course.
The torque is interesting though. Wonder where they are getting that information. The service manual in the shop and on Tech Authority (as of June 2016) says 13 lb-ft +/-2 and not to exceed 15.
Do you have a SRT w/the 6.4L V8?? The torque specs you have listed are for that engine.

The Mopar 5.7L hemi engine which is what this thread specifically is about requires a plug torque spec as follows ; NGK and Jeep have always recommended 18~21.6 Foot lbs for these plugs when installed into aluminum heads. That figure has always been the same and has never changed! Internet misinformation by the misinformed has clouded the issue!!!!!

This has all been covered several times in this thread ~ Reread it!
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  #152  
Old 09-22-2016, 09:02 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by falcon_o View Post

This link agrees with the torque specification provided by my dealer's service department.

Jeep Grand Cherokee WK2 - Maintenance information and schedules
I wouldn't trust that site. There is much myself and others have found incorrect there.

Quote:
Originally Posted by Raptor View Post
Do you have a SRT w/the 6.4L V8?? The torque specs you have listed are for that engine.

The Mopar 5.7L hemi engine which is what this thread specifically is about requires a plug torque spec as follows ; NGK and Jeep have always recommended 18~21.6 Foot lbs for these plugs when installed into aluminum heads. That figure has always been the same and has never changed! Internet misinformation by the misinformed has clouded the issue!!!!!

This has all been covered several times in this thread ~ Reread it!
Exactly, and the information is WRONG! You need to RTFM, not the thread!
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File Type: jpg Spark torque.jpg (105.2 KB, 22 views)
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  #153  
Old 09-22-2016, 10:58 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by The Evil Twin View Post
I wouldn't trust that site. There is much myself and others have found incorrect there.


Exactly, and the information is WRONG! You need to RTFM, not the thread!
No my friend I am not wrong, you are!

You are quoting recommended torque specs for a 6.4L SRT V8 motor not the 2011 and up WK2 5.7L hemi being discussed in this thread!!!!!!!!!

"That site" (wk2jeeps.com) has it right, as the torque specs are exactly what's listed in my 2012 genuine Chrysler Factory Service manual purchased directly from TechAuthority.

Not really sure what you have posted but if it's telling you anything other than 18~22.6ft/lbs for sparkplugs into a WK2 5.7L hemi with aluminum heads it's incorrect!

Why don't you go to your local dealer and tell them to call the Chrysler parts hotline and ask what the proper sparkplug torque specs for a WK2 5.7L hemi are? Post back and tell us what they say!!

You can then come back here and admit your mistake, we'll forgive you!
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  #154  
Old 09-22-2016, 11:07 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Beginning in 2009, the 5.7 changed to a gasket seat style plug. Prior years used a conical seat style. Hence, the change in torque values. It seems that, in some cases, the factory service information has not kept up with this change.

NGK recommended values for aluminum heads are:

Gasket seat type 18.0-21.6 ft lb (Chrysler 18.5-22)

Conical seat type 7.2-14.5 ft lb (Chrysler 11-15)
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  #155  
Old 09-22-2016, 11:10 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by clarklaflare View Post
Beginning in 2009, the 5.7 changed to a gasket seat style plug. Prior years used a conical seat style. Hence, the change in torque values. It seems that, in some cases, the factory service information has not kept up with this change.

NGK recommended values for aluminum heads are:

Gasket seat type 18.0-21.6 ft lb (Chrysler 18.5-22)

Conical seat type 7.2-14.5 ft lb (Chrysler 11-15)
Yes that is correct..... and I'm very sure Chrysler didn't make any WK2 Grand Cherokee's with circa 2009 and under 5.7L hemi engines in them! Pretty sure they all were built with the newer designed aluminum head 5.7L hemi engines!!!!!

Misguided & misinformed forum member, Mr Evil Twin, several times in this thread, has incorrectly posted sparkplug torque specs for the SRT6.4L hemi motor, not the 5.7L hemi we are discussing here. His mistake has nothing to do with the old 5.7L heads (pre-2009), that had a different plug seat and different corresponding plug torque spec.
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  #156  
Old 09-23-2016, 04:43 PM
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Re: DIY: Hemi 5.7L Spark Plug Change

Quote:
Originally Posted by falcon_o View Post
My owners manual specifies changing plugs at 32,000 using the NGK OEM plugs. If you use the NGK Yttirum the interval increases to 100,000 but these plugs are expensive.

Based upon my experience running copper core plugs to 64,000 has not resulted in a performance decrease thus my BS comment for the 32,000 specification. Change is easy and takes a bit over an hour and @ $2/Champion copper core plug not costly.

This link agrees with the torque specification provided by my dealer's service department.

Jeep Grand Cherokee WK2 - Maintenance information and schedules
Attached is a copy of the torque specifications given to me by my dealer's service department downloaded from their database indicating 18.5 - 22 ft lbs for the 2012 with the 5.7l hemi.
Attached Files
File Type: pdf 2012 5_7 lSpark Plug Torque Specification.pdf (317.2 KB, 16 views)
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